Bearing assembly for wind power gear box and wind power gear box

Abstract

The invention discloses a bearing assembly for a wind power gear box and the wind power gear box, and belongs to the technical field of gear boxes. The bearing assembly comprises a load bearing and a paired bearing which are coaxially arranged and abut against each other; the width of the load bearing is increased by delta w compared with that of a standard 32240 bearing, the width of the paired bearing is equal to that of a standard 30240 bearing, and the total width W1 of the load bearing and the paired bearing in the axial direction is 173-183 mm; the inner diameter of the load bearing is 200mm, and the inner diameter of the paired bearing is equal to the inner diameter of the load bearing; the outer diameter D1 of the load bearing is 365-375 mm, and the outer diameter of the paired bearing is equal to the outer diameter of the load bearing; and the taper angle of the carrying bearing is 18-22 degrees. By increasing the width and the outer diameter of the bearing, the taper angle is changed, the bearing capacity is improved, and meanwhile the requirements for rotating speed and service life are met.

Description

Technical Field

[0001] The present invention relates to the technical field of gear boxes, and in particular to a bearing assembly for a wind power gear box and a wind power gear box. Background Art

[0002] In the field of wind power generation, most of them use double-fed models, that is, the gearbox has a low-speed shaft and a high-speed shaft, the low-speed shaft is connected to the main shaft of the wind turbine, and the high-speed shaft is connected to the motor. Due to the cost factors of the motor and inverter, the speed of the high-speed shaft of the gearbox needs to be kept constant, which is basically around 1700r / min.

[0003] Since the speed range of the bearing is mainly determined by the linear speed of the large rib of the inner ring, when bearings of different gears are selected, the corresponding speed range is different.

[0004] The existing high-speed shaft uses standard bearings, and the 32240 bearings and 30240 bearings are used in pairs to form the first bearing assembly. Among them, the 32240 bearing is set on the load-bearing side of the high-speed shaft and is subject to a greater load. The 30240 bearing is used in pairs with the 32240 bearing. The inner diameter of the inner ring of the first bearing assembly is 200mm, the outer diameter of the outer ring is 360mm, and the total width is 168mm. The speed range of the first bearing assembly is slightly greater than 1700r / min, and the speed can meet the requirements, but the basic rated life is less than 20,000 hours, and the service life is short. Therefore, the standard 32240 bearings and 30240 bearings can no longer meet the life requirements.

[0005] If the next standard bearing is used, the 32244 bearing and the 30244 bearing are used in pairs to form the second bearing assembly. The inner diameter of the inner ring of the second bearing assembly is 200mm, the outer diameter of the outer ring is 400mm, and the total width is 186mm. Although it can meet the life requirements, due to the increase in the inner diameter of the inner ring, the speed range of the second bearing assembly is less than 1550r / min, which does not meet the 1700r / min requirement. If a gearbox with a speed of 1400r / min is used instead, the cost will be greatly increased. It can be seen that the existing standard bearings cannot meet both the life and speed requirements at the same time. Summary of the invention

[0006] The object of the present invention is to provide a bearing assembly for a wind turbine gearbox and a wind turbine gearbox, so as to meet the rotation speed requirement and have a long service life.

[0007] As conceived above, the technical solution adopted by the present invention is:

[0008] A bearing assembly for a wind power gearbox, the bearing assembly comprising a load-bearing bearing and a paired bearing which are coaxially arranged and abut against each other; the width of the load-bearing bearing is increased by Δw compared with a standard 32240 bearing, the width of the paired bearing is equal to the width of a standard 30240 bearing, and the total axial width W1 of the load-bearing bearing and the paired bearing is 173 mm to 183 mm; the inner diameter of the load-bearing bearing is 200 mm, and the inner diameter of the paired bearing is equal to the inner diameter of the load-bearing bearing; the outer diameter D1 of the load-bearing bearing is 365 mm to 375 mm, and the outer diameter of the paired bearing is equal to the outer diameter of the load-bearing bearing; the load-bearing bearing is a tapered roller bearing, and the load-bearing bearing comprises a plurality of first tapered rollers, and a first cone angle A1 is provided between the axis of the first tapered roller and the axis of the load-bearing bearing, and the first cone angle A1 is 18° to 22°.

[0009] The difference between the outer diameter D1 of the load-bearing bearing and 360 mm is Δd1, the difference between the total width W1 and 168 mm is Δw1, and Δd1 is equal to Δw1.

[0010] The outer diameter D1 of the load-bearing bearing is 370 mm, and the total width W1 is 178 mm.

[0011] Wherein, the width of the outer ring of the load-bearing bearing is 85 mm, and the width of the inner ring of the load-bearing bearing is 114 mm.

[0012] Wherein, the first cone angle A1 is 20.5°.

[0013] The total width W1 is equal to the distance between the end faces of the outer ring of the load-bearing bearing and the outer ring of the matching bearing which are far away from each other.

[0014] Wherein, the outer ring of the load-bearing bearing and the outer ring of the matching bearing are spaced apart and a spacer ring is sandwiched between the two.

[0015] Wherein, the inner ring of the load-bearing bearing abuts against the inner ring of the matching bearing.

[0016] The distance between the end faces of the inner ring of the load-bearing bearing and the inner ring of the matching bearing that are away from each other is W2, and W2 is smaller than W1.

[0017] A wind power gearbox, comprising:

[0018] Box;

[0019] The low-speed shaft and the high-speed shaft are both passed through the box body, and one end of the high-speed shaft extends out of the box body for connection with the motor;

[0020] A transmission mechanism, which is arranged between the low-speed shaft and the high-speed shaft;

[0021] The bearing assembly as described above is arranged on the high-speed shaft, and the load-bearing bearing is located on the side close to the motor.

[0022] Beneficial effects of the present invention:

[0023] The bearing assembly for a wind power gearbox proposed in the present invention comprises a load-bearing and a paired bearing which are coaxially arranged and abut against each other; by increasing the width of the load-bearing bearing while keeping the width of the paired bearing unchanged, it is equivalent to increasing the total width of the load-bearing bearing and the paired bearing along the axial direction, thereby improving the load-bearing capacity; the inner diameter of the load-bearing bearing is 200 mm, which meets the speed requirement of 1700 r / min, the outer diameter of the load-bearing bearing is 365 mm to 375 mm, and the size of the first cone angle A1 is 18° to 22°. By increasing the outer diameter and adjusting the cone angle, the load-bearing capacity is further improved to meet the service life requirement; through the above-mentioned improvements to the load-bearing bearing and the paired bearing, the speed and life requirements are met at the same time, and after being applied to the wind power gearbox, the wind power gearbox is less modified, which greatly reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of a bearing assembly for a wind power gearbox provided by an embodiment of the present invention;

[0025] Figure 2 It is a partial structural cross-sectional view of a wind turbine gearbox provided by an embodiment of the present invention.

[0026] In the figure:

[0027] 10. load-bearing bearing; 11. first outer ring; 12. first inner ring; 13. first rolling element;

[0028] 20. Paired bearing; 21. Second outer ring; 22. Second inner ring; 23. Second rolling element;

[0029] 30. Spacer;

[0030] 100, housing; 200, high-speed shaft; 300, cylindrical roller bearing. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0035] See also Figure 1 The embodiment of the present invention provides a bearing assembly for a wind power gearbox, comprising a load-bearing 10 and a paired bearing 20 which are coaxially arranged and abut against each other; the width of the load-bearing 10 is increased by Δw compared with the standard 32240 bearing, the width of the paired bearing 20 is equal to the width of the standard 30240 bearing, and the total axial width W1 of the load-bearing 10 and the paired bearing 20 is 173mm-183mm; the inner diameter of the load-bearing 10 is 200mm, and the inner diameter of the paired bearing 20 is equal to the inner diameter of the load-bearing 10; the outer diameter of the load-bearing 10 is 365mm-375mm, and the outer diameter of the paired bearing 20 is equal to the outer diameter of the load-bearing 10; the load-bearing 10 is a tapered roller bearing, and the load-bearing 10 includes a plurality of first tapered rollers, and a first cone angle A1 is provided between the axis of the first tapered roller and the axis of the load-bearing 10, and the size of the first cone angle A1 is 18°-22°.

[0036] By increasing the width of the load-bearing bearing 10 while keeping the width of the paired bearing 20 unchanged, it is equivalent to increasing the total axial width of the load-bearing bearing 10 and the paired bearing 20, thereby improving the load-bearing capacity; the inner diameter of the load-bearing bearing 10 is 200 mm, which meets the speed requirement of 1700 r / min, the outer diameter of the load-bearing bearing 10 is 365 mm to 375 mm, and the size of the first cone angle A1 is 18° to 22°. By increasing the outer diameter and adjusting the cone angle, the load-bearing capacity is further improved to meet the service life requirement; through the above-mentioned improvements to the load-bearing bearing 10 and the paired bearing 20, the speed and life requirements are met at the same time.

[0037] Most existing gearboxes use standard bearings, and in order to meet life requirements, most of them use technical means such as increasing the high-speed center distance and reducing the high-speed helix angle. However, this application improves the bearings and applies them to wind power gearboxes, which requires fewer changes to the wind power gearboxes and greatly reduces costs.

[0038] Since the total width of the first bearing assembly composed of the original 32240 bearing and the 30240 bearing is 168 mm, and the width of the load-bearing bearing 10 in this embodiment is increased, and the width of the matching bearing 20 remains unchanged, the total axial width W1 of the load-bearing bearing 10 and the matching bearing 20 is 173 mm to 183 mm, which is equivalent to an increase of Δw of 5 mm to 15 mm in the load-bearing bearing 10 compared with the standard 32240 bearing.

[0039] The widening of the load-bearing bearing 10 may be to widen the inner ring or the outer ring or both the inner ring and the outer ring. In this embodiment, the inner ring and the outer ring of the load-bearing bearing 10 are widened at the same time, and the total width of the load-bearing bearing 10 increases by 5 mm to 15 mm.

[0040] Bearings usually include an inner ring, an outer ring, and rolling elements disposed between the inner ring and the outer ring. The total width of the bearing is the distance from one end of the bearing to the other end of the bearing along the axial direction of the bearing. In some bearings, the width of the inner ring is greater than the width of the outer ring. In the axial direction, the two end faces of the outer ring are located between the two end faces of the inner ring. The total width of the bearing is the distance between the two end faces of the inner ring; in some bearings, the width of the outer ring is greater than the width of the inner ring. The two end faces of the inner ring are located between the two end faces of the outer ring. The total width of the bearing is the distance between the two end faces of the outer ring; in some bearings, the inner ring and the outer ring are staggered in the axial direction. One end face of the outer ring is located between the two end faces of the inner ring, and the other end face of the outer ring is located outside the two end faces of the inner ring. The total width of the bearing is the maximum distance between one end face of the inner ring and one end face of the outer ring.

[0041] In this embodiment, the total axial width W1 of the load-bearing bearing 10 and the paired bearing 20 is equal to the distance between the end surfaces of the outer ring of the load-bearing bearing 10 and the outer ring of the paired bearing 20 that are away from each other. Figure 1It can be seen that, in the axial direction, at one end of the bearing assembly, the inner ring of the load-bearing 10 does not exceed the outer ring of the load-bearing 10, and at the other end of the bearing assembly, the inner ring of the matching bearing 20 does not exceed the outer ring of the matching bearing 20. Therefore, the total width W1 of the load-bearing 10 and the matching bearing 20 in the axial direction is equal to the distance between the end faces of the outer ring of the load-bearing 10 and the outer ring of the matching bearing 20 that are far away from each other.

[0042] The load-bearing bearing 10 and the paired bearing 20 both include an outer ring, an inner ring and rolling elements. For ease of understanding, the load-bearing bearing 10 includes a first outer ring 11, a first inner ring 12 and a first rolling element 13, and the paired bearing 20 includes a second outer ring 21, a second inner ring 22 and a second rolling element 23.

[0043] The outer ring of the load-bearing bearing 10 and the outer ring of the paired bearing 20 are spaced apart and a spacer 30 is sandwiched between the two. Lubricating oil can be delivered to the rolling element through the oil guide hole opened on the spacer 30. That is, the first outer ring 11 and the second outer ring 21 are spaced apart and a spacer 30 is sandwiched between the two.

[0044] The inner ring of the load-bearing 10 abuts against the inner ring of the paired bearing 20 to increase stability. The distance between the end faces of the inner ring of the load-bearing 10 and the inner ring of the paired bearing 20 that are far from each other is W2, and W2 is smaller than W1. That is, the first inner ring 12 abuts against the second inner ring 22, and the distance between the end faces of the first inner ring 12 and the second inner ring 22 that are far from each other is W2.

[0045] The difference between the outer diameter D1 of the load-bearing bearing 10 and 360 mm is Δd1, and the difference between the total width W1 and 168 mm is Δw1, and Δd1 is equal to Δw1. That is, for the load-bearing bearing 10, the increase in the outer diameter is equal to the increase in the width based on the existing standard bearing. By increasing the outer diameter and the width by the same value, the load-bearing bearing 10 is subjected to balanced force and the load-bearing capacity is guaranteed.

[0046] In this embodiment, the outer diameter D1 of the load-bearing bearing 10 is 370 mm, and the total width W1 is equal to 178 mm. In some embodiments, the outer diameter D1 of the load-bearing bearing 10 is 365 mm, and the total width W1 is equal to 173 mm. In some embodiments, the outer diameter D1 of the load-bearing bearing 10 is 375 mm, and the total width W1 is equal to 183 mm.

[0047] The width of the outer ring of the original 32240 bearing is 78 mm. In this embodiment, the width of the outer ring of the load-bearing bearing 10 is 85 mm. The width of the outer ring of the original 30240 bearing is 48 mm. In this embodiment, the width of the outer ring of the paired bearing 20 is 48 mm. According to the total width W1 of 178 mm, the width of the outer ring of the load-bearing bearing 10 is 85 mm, and the width of the outer ring of the paired bearing 20 is 48 mm, it can be known that the width of the spacer 30 along the axial direction is 45 mm.

[0048] The width of the inner ring of the original 32240 bearing is 98 mm. In this embodiment, the width of the inner ring of the load-bearing bearing 10 is 114 mm. The width of the inner ring of the original 30240 bearing is 58 mm. In this embodiment, the width of the inner ring of the paired bearing 20 is 58 mm. Therefore, the distance W2 between the end faces of the inner ring of the load-bearing bearing 10 and the inner ring of the paired bearing 20 that are away from each other is equal to 172 mm.

[0049] The original 32240 bearing has a cone angle of 16°. The axis of the first tapered roller of the load-bearing bearing 10 has a first cone angle A1 with the axis of the load-bearing bearing 10, and the magnitude of the first cone angle A1 is 18° to 22°. By changing the cone angle of the load-bearing bearing 10, it is more suitable for the stress condition of the high-speed shaft 200, thereby improving the load-bearing capacity.

[0050] In this embodiment, the first cone angle A1 is 20.5°. In some embodiments, the first cone angle A1 is 18°, 19°, 20°, 21° or 22°.

[0051] In the attached Figure 1 In the figure, W1 represents the total axial width of the load-bearing bearing 10 and the paired bearing 20; A1 represents the angle between the axis of the first tapered roller and the axis of the load-bearing bearing 10; and W2 represents the distance between the end faces of the inner ring of the load-bearing 10 and the inner ring of the paired bearing 20 that are away from each other.

[0052] The paired bearing 20 is a tapered roller bearing, and the paired bearing 20 includes a plurality of second tapered rollers, and a second taper angle A2 is formed between the axis of the second tapered rollers and the axis of the paired bearing 20. The second taper angle A2 may be equal to the taper angle of the original 30240 bearing.

[0053] In one embodiment, the inner diameter of the load-bearing bearing 10 is 200 mm, the outer diameter of the load-bearing bearing 10 is 370 mm, the inner diameter of the matching bearing 20 is 200 mm, the outer diameter of the matching bearing 20 is 370 mm, and the total axial width W1 of the load-bearing bearing 10 and the matching bearing 20 is 178 mm.

[0054] The various dimensions of the load-bearing bearing 10 and the matching bearing 20 meet the tolerance requirements.

[0055] See also Figure 2 The embodiment of the present invention also provides a wind power gearbox, including a housing 100, a low-speed shaft, a high-speed shaft 200, a transmission mechanism and the above-mentioned bearing assembly. The low-speed shaft and the high-speed shaft 200 are both arranged in the housing 100, and one end of the high-speed shaft 200 extends out of the housing 100 for connection with the motor; the transmission mechanism is arranged between the low-speed shaft and the high-speed shaft 200; the bearing assembly is arranged on the high-speed shaft 200, and the load-bearing bearing 10 is located on the side close to the motor. By adopting the above-mentioned bearing assembly, the speed and life requirements are met at the same time, and there is no need to make major changes to the wind power gearbox, thereby reducing costs.

[0056] When in use, the load-bearing bearing 10 is located on the side close to the motor, that is, the load-bearing bearing 10 is arranged on the side subjected to greater force to play a load-bearing role, while the matching bearing 20 is only used to match with the load-bearing bearing 10 and is subjected to less force.

[0057] The paired bearing 20 is in contact with the load-bearing bearing 10, and the paired bearing 20 is located on the side away from the motor. In addition to the above-mentioned bearing assembly, a cylindrical roller bearing 300 is also provided on the high-speed shaft 200, and the cylindrical roller bearing 300 is spaced apart from the paired bearing 20 to support the high-speed shaft 200.

[0058] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A bearing assembly for a wind turbine gearbox, characterized in that: The bearing assembly comprises a load-bearing bearing (10) and a matching bearing (20) which are coaxially arranged and abut against each other; The width of the load-bearing bearing (10) is increased by Δw compared with the standard 32240 bearing, the width of the paired bearing (20) is equal to the width of the standard 30240 bearing, and the total width W1 of the load-bearing bearing (10) and the paired bearing (20) along the axial direction is 173 mm to 183 mm; The inner diameter of the load-bearing bearing (10) is 200 mm, and the inner diameter of the matching bearing (20) is equal to the inner diameter of the load-bearing bearing (10); The outer diameter D1 of the load-bearing bearing (10) is 365 mm to 375 mm, and the outer diameter of the paired bearing (20) is equal to the outer diameter of the load-bearing bearing (10); The load-bearing bearing (10) is a tapered roller bearing, and the load-bearing bearing (10) comprises a plurality of first tapered rollers, and a first cone angle A1 is provided between the axis of the first tapered roller and the axis of the load-bearing bearing (10), and the magnitude of the first cone angle A1 is 18° to 22°.

2. The bearing assembly for a wind turbine gearbox according to claim 1, characterized in that: The difference between the outer diameter D1 of the load-bearing bearing (10) and 360 mm is Δd1, the difference between the total width W1 and 168 mm is Δw1, and Δd1 is equal to Δw1.

3. The bearing assembly for a wind power gearbox according to claim 2, characterized in that: The outer diameter D1 of the load-bearing bearing (10) is 370 mm, and the total width W1 is equal to 178 mm.

4. The bearing assembly for a wind power gearbox according to claim 3, characterized in that: The width of the outer ring of the load-bearing bearing (10) is 85 mm, and the width of the inner ring of the load-bearing bearing (10) is 114 mm.

5. The bearing assembly for a wind power gearbox according to claim 1, characterized in that: The first cone angle A1 is 20.5°.

6. The bearing assembly for a wind turbine gearbox according to claim 1, characterized in that: The total width W1 is equal to the distance between the end surfaces of the outer ring of the load-bearing bearing (10) and the outer ring of the matching bearing (20) which are away from each other.

7. The bearing assembly for a wind turbine gearbox according to claim 6, characterized in that: The outer ring of the load-bearing bearing (10) and the outer ring of the matching bearing (20) are arranged at a distance, and a spacer ring (30) is sandwiched between the two.

8. The bearing assembly for a wind turbine gearbox according to claim 6, characterized in that: The inner ring of the load-bearing bearing (10) abuts against the inner ring of the matching bearing (20).

9. The bearing assembly for a wind turbine gearbox according to claim 8, characterized in that: The distance between the end faces of the inner ring of the load-bearing bearing (10) and the inner ring of the matching bearing (20) that are away from each other is W2, and W2 is smaller than W1.

10. A wind power gearbox, characterized in that: include: Box (100); A low-speed shaft and a high-speed shaft (200) are both inserted into the housing (100); one end of the high-speed shaft (200) extends out of the housing (100) and is used for connection with a motor; A transmission mechanism, which is arranged between the low-speed shaft and the high-speed shaft (200); The bearing assembly for a wind turbine gearbox according to any one of claims 1 to 9 is arranged on the high-speed shaft (200), and the load-bearing bearing (10) is located on a side close to the motor.

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