Oil circuit sealing structure and gear box

Abstract

The present invention provides an oil circuit sealing structure and a gear box. The oil circuit sealing structure comprises: a base body, a first shaft hole is formed on the base body; a wear-resistant layer is arranged on the inner wall of the first shaft hole, and the inner surface of the wear-resistant layer forms an assembly hole; a planetary carrier, the journal of the planetary carrier is rotatably installed in the assembly hole, and a gap that can play a sealing role is formed between the journal and the inner surface of the wear-resistant layer. The technical solution of the present invention can effectively solve the problem of poor lubrication of the gear box in the related art.

Description

Technical Field

[0001] The present invention relates to the field of wind power gearboxes of wind turbines, and in particular to an oil circuit sealing structure and a gearbox. Background Art

[0002] In a wind turbine, the wind turbine gearbox is a key component of the wind turbine. With the demand for increased power of wind turbines, wind turbine gearboxes are required to have higher power and higher reliability, and the lubrication requirements for gearboxes are also getting higher and higher. In the related technology, wind turbine gearboxes generally use planetary carriers, bearings and bases. Bearings are installed on the shaft necks of the planetary carriers. The bearings play the role of supporting the shaft necks, and the base only plays the role of supporting the bearings. In this case, in order to meet the lubrication requirements in the gearbox, other structures such as pipelines, large clearance long paths, matching oil circuits, etc. need to be added inside. These structures easily lead to complex internal structures, increased amount of lubricating oil, and poor lubrication, which leads to poor reliability of the gearbox. Summary of the invention

[0003] The main purpose of the present invention is to provide an oil circuit sealing structure and a gear box to solve the problem of poor lubrication of the gear box in the related art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, an oil circuit sealing structure is provided, comprising: a base body, a first axial hole is opened on the base body; a wear-resistant layer is arranged on the inner wall of the first axial hole, and the inner surface of the wear-resistant layer forms an assembly hole; a planetary carrier, the shaft neck of the planetary carrier is rotatably installed in the assembly hole, and a gap that can play a sealing role is formed between the shaft neck and the inner surface of the wear-resistant layer.

[0005] Furthermore, the material of the wear-resistant layer is copper-based alloy.

[0006] Further, the ratio of the thickness of the substrate in the radial direction to the thickness of the wear-resistant layer in the radial direction is between 22:1 and 37:1.

[0007] Furthermore, a first oil inlet hole extending in a radial direction of the base is provided on the base, the first oil inlet hole penetrates the outer surface of the base and the inner wall of the first axial hole, and an oil inlet channel penetrating the inner and outer surfaces of the wear-resistant layer is opened on the wear-resistant layer, and the oil inlet channel is connected to the first oil inlet hole.

[0008] Furthermore, the wear-resistant layer is provided with an oil inlet hole penetrating the inner and outer surfaces of the wear-resistant layer, and the channel in the oil inlet hole forms an oil inlet channel, or the wear-resistant layer includes a first layer segment and a second layer segment arranged at intervals along the axial direction of the first axial hole, and the channel between the first layer segment and the second layer segment forms an oil inlet channel.

[0009] Furthermore, in the case where the wear-resistant layer is provided with an oil inlet hole, an annular oil storage groove is provided on the inner wall of the wear-resistant layer, and the oil inlet hole is provided on the groove wall of the oil storage groove.

[0010] Furthermore, the oil circuit sealing structure also includes a first bearing, which is sleeved on the journal and has a first abutting surface abutting against a first end surface of the first bearing, and the base has a second abutting surface abutting against a second end surface of the first bearing opposite to the first end surface.

[0011] Furthermore, an abutment protrusion is provided on the end face of the base body close to the first bearing, and the end face of the abutment protrusion forms a second abutment face, and / or a second axial hole is opened on the base body, and the second axial hole is located on the side of the first axial hole away from the first bearing, and the first axial hole and the second axial hole form an inner hole of the base body. The oil circuit sealing structure also includes: a rotating shaft, which extends into the second axial hole; and a second bearing, which is sleeved on the rotating shaft and installed between the second axial hole and the rotating shaft.

[0012] Furthermore, the oil circuit sealing structure also includes: a bearing, the bearing is mounted on a base, a second oil inlet hole connected to the first oil inlet hole is opened on the base, the oil outlet of the second oil inlet hole extends toward the bearing, and / or an oil guide channel is arranged in the planetary carrier, the oil inlet of the oil guide channel is connected to the first oil inlet hole through the oil inlet channel.

[0013] According to another aspect of the present invention, a gearbox is provided, comprising: a box body oil circuit sealing structure, which is arranged on the box body, and the oil circuit sealing structure is the above-mentioned oil circuit sealing structure.

[0014] By applying the technical solution of this embodiment, a gap is set between the journal and the inner surface of the wear-resistant layer. Due to the presence of the wear-resistant layer, the gap can be made very small, thereby achieving a sealing effect. The lubricating oil flows into the gap, and an oil film is formed between the journal and the wear-resistant layer, so that the journal does not directly contact the wear-resistant layer, thereby greatly reducing the friction loss and surface wear between the journal and the wear-resistant layer. In addition, the wear-resistant layer can reduce friction when the journal rotates, so that the size of the gap can be kept stable, avoiding leakage of lubricating oil due to the increase of the gap, and ensuring the stability of the oil pressure of the oil circuit sealing structure. In addition, the oil film also has a shock-absorbing effect, which can reduce the vibration during the rotation of the journal, thereby further improving the stability of the oil circuit sealing structure during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic longitudinal section structure diagram showing a partial structure of an embodiment of an oil circuit sealing structure according to the present invention;

[0017] Figure 2 Shows Figure 1 An enlarged structural diagram of the oil circuit sealing structure at A;

[0018] Figure 3 Shows Figure 1 A schematic longitudinal cross-sectional structure diagram of a base body of an oil circuit sealing structure; and

[0019] Figure 4 Shows Figure 3 Schematic diagram of the enlarged structure at B of the substrate.

[0020] The above drawings include the following reference numerals:

[0021] 1. Gap; 10. Base; 11. First shaft hole; 12. First oil inlet hole; 13. Oil inlet channel; 14. Second abutting surface; 15. Second shaft hole; 16. Second oil inlet hole; 20. Wear-resistant layer; 21. Assembly hole; 23. Oil storage tank; 30. Planetary carrier; 31. Journal; 32. First abutting surface; 33. Oil guide channel; 40. First bearing; 50. Abutting protrusion; 60. Rotating shaft; 70. Second bearing; 80. Housing. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] like Figures 1 to 4 As shown, the oil circuit sealing structure of this embodiment includes: a base 10, a wear-resistant layer 20 and a planet carrier 30. The base 10 is provided with a first shaft hole 11; the wear-resistant layer 20 is arranged on the inner wall of the first shaft hole 11, and the inner surface of the wear-resistant layer 20 forms an assembly hole 21; the planet carrier 30, the journal 31 of the planet carrier 30 is rotatably installed in the assembly hole 21, and a gap 1 that can play a sealing role is formed between the journal 31 and the inner surface of the wear-resistant layer 20.

[0024] By applying the technical solution of this embodiment, a gap 1 is set between the journal 31 and the inner surface of the wear-resistant layer 20. Due to the presence of the wear-resistant layer 20, the gap 1 can be made very small, thereby achieving a sealing effect. The lubricating oil flows into the gap 1, and an oil film is formed between the journal 31 and the wear-resistant layer 20, so that the journal 31 does not directly contact the wear-resistant layer 20, thereby greatly reducing the friction loss and surface wear between the journal 31 and the wear-resistant layer 20. In addition, the wear-resistant layer 20 can reduce friction when the journal 31 rotates, so that the size of the gap 1 can be kept stable, avoiding the leakage of lubricating oil due to the increase of the gap 1, and ensuring the stability of the oil pressure of the oil circuit sealing structure. In addition, the oil film also has a shock-absorbing effect, which can reduce the vibration of the journal 31 during the rotation process, thereby further improving the stability of the oil circuit sealing structure during operation.

[0025] It should be noted that, in the present embodiment, the base 10 is a bearing seat, and the main material of the base 10 is high-strength structural steel. Since this material has strong rigidity, it can meet the support function for the rolling bearing.

[0026] It should also be noted that the size of the gap 1 is between 0.090 mm and 0.105 mm.

[0027] like Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the material of the wear-resistant layer 20 is a copper-based alloy. In the above structure, the copper-based alloy can reduce the surface wear of the journal 31 during operation. The journal 31 can rotate more smoothly, thereby ensuring the stable operation of the journal 31. It should be noted that the copper-based alloy is poured into the first axial hole 11 of the substrate 10 by a casting process, so that the copper-based alloy and the high-strength structural steel of the substrate 10 have a high bonding strength, thereby preventing the wear-resistant layer 20 from falling off the substrate 10.

[0028] like Figure 3 As shown, in this embodiment, the ratio of the thickness of the substrate 10 in its radial direction to the thickness of the wear-resistant layer 20 in its radial direction is between 22:1 and 37:1. In the above structure, the thickness of the substrate 10 is between 100mm-120mm, and the above structure makes the substrate 10 have high rigidity and good wear resistance. The thickness of the wear-resistant layer 20 is between 3mm-5mm. If the above ratio is too large, it means that the thickness of the wear-resistant layer 20 is too small, which will result in low strength and short service life of the wear-resistant layer. If the above ratio is too small, it means that the thickness of the wear-resistant layer 20 is too large, which will lead to waste of production materials and increase production costs.

[0029] like Figures 1 to 3As shown, in this embodiment, the base 10 is provided with a first oil inlet hole 12 extending in the radial direction of the base 10, the first oil inlet hole 12 penetrates the outer surface of the base 10 and the inner wall of the first shaft hole 11, and the wear-resistant layer 20 is provided with an oil inlet channel 13 penetrating the inner and outer surfaces of the wear-resistant layer 20, and the oil inlet channel 13 is connected to the first oil inlet hole 12. In the above structure, lubricating oil can enter between the wear-resistant layer 20 and the journal 31 through the first oil inlet hole 12 and the oil inlet channel 13, thereby reducing the friction loss between the wear-resistant layer 20 and the journal 31, making the rotation of the journal 31 smoother, and reducing the surface wear of the journal 31.

[0030] like Figure 3 and Figure 4 As shown, in the present embodiment, the wear-resistant layer 20 is provided with an oil inlet hole penetrating the inner surface and the outer surface of the wear-resistant layer 20, and the channel in the oil inlet hole forms an oil inlet channel 13. In the above structure, the oil inlet holes include a plurality of holes evenly distributed in the circumferential direction of the wear-resistant layer 20, and accordingly, the first oil inlet holes 12 are a plurality corresponding to the number of the oil inlet holes. The above structure is simple, so that the lubricating oil can be evenly distributed between the wear-resistant layer 20 and the journal 31, thereby achieving a better lubrication effect. Of course, in other embodiments not shown in the figure, the wear-resistant layer may also include a first layer segment and a second layer segment arranged at intervals along the axial direction of the first shaft hole, and the channel between the first layer segment and the second layer segment forms the oil inlet channel 13. The above structure can also achieve the effect of evenly distributing the lubricating oil.

[0031] It should be noted that when the temperature of the oil circuit sealing structure increases, the copper-based alloy has a tendency to expand. At this time, the strength of the substrate 10 can limit the expansion of the copper-based alloy, thereby ensuring that the fitting clearance between the copper-based alloy and the journal 31 is within a preset range. When the temperature of the oil circuit sealing structure decreases, the copper-based alloy has a tendency to shrink. At this time, the molecular bonding force between the substrate 10 and the copper-based alloy can offset the shrinkage of the copper-based alloy, thereby ensuring that the fitting clearance between the copper-based alloy and the journal 31 is within a preset range.

[0032] like Figure 3 and Figure 4 As shown, in this embodiment, an annular oil storage groove 23 is provided on the inner wall of the wear-resistant layer 20, and the oil inlet hole is provided on the groove wall of the oil storage groove 23. In the above structure, the annular oil storage groove 23 can play the role of storing lubricating oil, ensuring that the amount of lubricating oil in the gap 1 between the journal 31 and the wear-resistant layer 20 is sufficient, so that the oil pressure of the gear box is stable and the lubrication is sufficient.

[0033] It should be noted that the copper-based alloy of the wear-resistant layer 20 and the oil film can provide dual protection for the journal 31. When the journal 31 is operating normally, the journal 31 operates smoothly and the oil pressure is stable due to the existence of the gap 1. However, when the journal 31 is deformed during operation, the journal 31 will contact the copper-based alloy. At this time, the copper-based alloy plays the role of a sliding bearing, reduces wear, ensures the matching clearance, and thus ensures sufficient lubricating oil and stable oil pressure.

[0034] like Figures 1 to 4 As shown, in this embodiment, the bearing structure also includes a first bearing 40, which is sleeved on the journal 31, and the journal 31 has a first abutting surface 32 abutting against the first end face of the first bearing 40, and the base 10 has a second abutting surface 14 abutting against the second end face of the first bearing 40 opposite to the first end face. In the above structure, after the planet carrier 30 and the first bearing 40 are installed, it is necessary to adjust the axial installation clearance of the first bearing 40 so that the first bearing 40 meets the assembly requirements. The base 10 can abut against the first bearing 40 through the second abutting surface 14 to limit the position of the first bearing 40. When it is necessary to adjust the installation clearance of the first bearing 40, the assembly requirements of the first bearing 40 can be met by adjusting the position of the second abutting surface 14.

[0035] like Figure 3 and Figure 4 As shown, in this embodiment, an abutting protrusion 50 is provided on the end face of the base 10 close to the first bearing 40, and the end face of the abutting protrusion 50 forms the second abutting surface 14. In the above structure, the end face of the abutting protrusion 50 can form a stopper for the first bearing 40. When the position of the second abutting surface 14 needs to be adjusted, the height of the abutting protrusion 50 can be changed by grinding the abutting protrusion 50, so as to achieve the position adjustment of the second abutting surface 14. It should be noted that the design height of the abutting protrusion 50 should be greater than the maximum value of the installation gap, so as to facilitate the assembly requirements of the first bearing 40 by grinding the abutting protrusion 50. It should also be noted that the base 10 has a first shaft section and a second shaft section connected to the first shaft section, the diameter of the first shaft section is smaller than the diameter of the second shaft section, a step surface is formed between the first shaft section and the second shaft section, and the abutting protrusion 50 is provided on the end face of the first shaft section. When installing the base 10, it is necessary to install the base 10 on the fixing member (box 80), and make the second abutting surface 14 of the base 10 abut against the first bearing 40, and the step surface of the base 10 abut against the third abutting surface of the fixing member (box 80). When determining the grinding amount of the abutting protrusion 50, the first bearing 40 is located at a predetermined position, and the distance F from the second end surface of the first bearing 40 to the third abutting surface of the fixing member is measured, and then the distance G between the second abutting surface 14 of the base 10 and the step surface is measured. The difference between the distance G and the distance F is the grinding amount of the abutting protrusion 50.

[0036] like Figures 1 to 3 As shown, in this embodiment, a second shaft hole 15 is provided on the base 10, and the second shaft hole 15 is located on the side of the first shaft hole 11 away from the first bearing 40. The first shaft hole 11 and the second shaft hole 15 form the inner hole of the base 10, and the bearing structure also includes a rotating shaft 60 and a second bearing 70. The rotating shaft 60 extends into the second shaft hole 15; the second bearing 70 is sleeved on the rotating shaft 60 and installed between the second shaft hole 15 and the rotating shaft 60. In the above structure, the base 10 is provided with a first shaft hole 11 that matches the shaft neck 31 and a second shaft hole 15 that carries the second bearing 70, so that the base 10 can support the second bearing 70 while adjusting the axial clearance of the first bearing 40. The above structure improves the functionality of the base 10.

[0037] like Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the oil circuit sealing structure also includes a bearing, and the bearing is mounted on the base 10. The base 10 is provided with a second oil inlet hole 16 connected to the first oil inlet hole 12, and the oil outlet of the second oil inlet hole 16 extends toward the bearing. In the above structure, the base 10 can play the role of supplying oil to the bearing mounted on the base 10. It should be noted that the above-mentioned "bearing is mounted in the base 10" means that there is a matching relationship between the bearing and the base 10. The matching relationship includes that the bearing is arranged in the base 10, or the bearing is in direct or indirect contact with the base 10. In this embodiment, the bearing includes a first bearing 40 abutting against the base 10 and a second bearing 70 arranged in the base 10. The second oil inlet hole 16 guides the lubricating oil in the first oil inlet hole 12 to the first bearing 40 and the second bearing 70 respectively.

[0038] like Figure 1 and Figure 2 As shown, in this embodiment, an oil guide channel 33 is provided in the planetary carrier 30, and the oil inlet of the oil guide channel 33 is connected to the first oil inlet hole 12 through the oil inlet channel 13. In the above structure, the oil guide channel 33 is connected to the lubrication system of the planetary carrier 30, and the lubrication system of the planetary carrier 30 can ensure sufficient lubrication during the operation of the planetary gear train. In this embodiment, the first oil inlet hole 12 is connected to the oil inlet channel 13, and the oil inlet channel 13 is connected to the oil guide channel 33. The above structure can supply oil to the lubrication system of the planetary carrier 30 by adding lubricating oil in the first oil inlet hole 12. It should be noted that the presence of the wear-resistant layer 20 ensures the size of the gap 1 between the base 10 and the journal 31, so that the lubricating oil flowing through the oil guide channel 33 is sufficient and the oil pressure is stable, thereby ensuring the stability of the lubrication system.

[0039] The present application also provides a gearbox, and the gearbox according to the embodiment of the present application includes an oil circuit sealing structure, and the oil circuit sealing structure is the above-mentioned oil circuit sealing structure. Since the oil circuit sealing structure has the advantages of simple structure, strong functionality, good lubricity and stable operation, the gearbox having the oil circuit sealing structure also has the above-mentioned advantages.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oil circuit sealing structure, characterized in that: include: A base body (10), wherein a first axial hole (11) is formed on the base body (10); A wear-resistant layer (20) is arranged on the inner wall of the first shaft hole (11), and an assembly hole (21) is formed on the inner surface of the wear-resistant layer (20); A planet carrier (30), wherein a journal (31) of the planet carrier (30) is rotatably mounted in the assembly hole (21), and a gap (1) capable of performing a sealing function is formed between the journal (31) and the inner surface of the wear-resistant layer (20); The base (10) is provided with a first oil inlet hole (12) extending in the radial direction of the base (10), the first oil inlet hole (12) penetrating the outer surface of the base (10) and the inner wall of the first shaft hole (11), the wear-resistant layer (20) is provided with an oil inlet channel (13) penetrating the inner surface and the outer surface of the wear-resistant layer (20), the oil inlet channel (13) being connected to the first oil inlet hole (12); a first bearing (40), the first bearing (40) being sleeved on the journal (31), the journal (31) having a first abutting surface (32) abutting against a first end surface of the first bearing (40), and the base (10) having a second abutting surface (14) abutting against a second end surface of the first bearing (40) opposite to the first end surface; The base body (10) is provided with a second shaft hole (15), the second shaft hole (15) is located on a side of the first shaft hole (11) away from the first bearing (40), the first shaft hole (11) and the second shaft hole (15) form an inner hole of the base body (10), and the oil circuit sealing structure further comprises: a rotating shaft (60), the rotating shaft (60) extends into the second shaft hole (15); A second bearing (70) is sleeved on the rotating shaft (60) and installed between the second shaft hole (15) and the rotating shaft (60); The base body (10) is provided with two second oil inlet holes (16) connected to the first oil inlet hole (12); an oil outlet of one of the second oil inlet holes (16) extends toward the first bearing (40), and an oil outlet of the other second oil inlet hole (16) extends toward the second bearing (70).

2. The oil circuit sealing structure according to claim 1, characterized in that: The material of the wear-resistant layer (20) is a copper-based alloy.

3. The oil circuit sealing structure according to claim 1, characterized in that: The ratio of the thickness of the substrate (10) in the radial direction to the thickness of the wear-resistant layer (20) in the radial direction is between 22:1 and 37:

1.

4. The oil circuit sealing structure according to claim 1, characterized in that: The wear-resistant layer (20) is provided with an oil inlet hole penetrating the inner surface and the outer surface of the wear-resistant layer (20), and the channel in the oil inlet hole forms the oil inlet channel (13); or, the wear-resistant layer (20) includes a first layer segment and a second layer segment arranged at intervals along the axial direction of the first axial hole (11), and the channel between the first layer segment and the second layer segment forms the oil inlet channel (13).

5. The oil circuit sealing structure according to claim 4, characterized in that: When the oil inlet hole is provided on the wear-resistant layer (20), an annular oil storage groove (23) is provided on the inner wall of the wear-resistant layer (20), and the oil inlet hole is provided on the groove wall of the oil storage groove (23).

6. The oil circuit sealing structure according to claim 1, characterized in that: An abutment protrusion (50) is provided on the end surface of the base body (10) close to the first bearing (40), and the end surface of the abutment protrusion (50) forms the second abutment surface (14).

7. The oil circuit sealing structure according to claim 1, characterized in that: An oil guide channel (33) is provided in the planet carrier (30), and an oil inlet of the oil guide channel (33) is connected to the first oil inlet hole (12) through the oil inlet channel (13).

8. A gear box comprising: Box(80) An oil circuit sealing structure is arranged on the box body (80), characterized in that the oil circuit sealing structure is the oil circuit sealing structure according to any one of claims 1 to 7.

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