风电主轴单元
By designing segmented inner and outer rings, combined with detachable end caps and elastic elements, the problem of difficult disassembly and maintenance of the wind-side bearings on the wind turbine main shaft unit has been solved, achieving simplified bearing disassembly, cost reduction, and extended service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINLEI TRANSMISSION TECHNOLOGY (SUZHOU) CO LTD
- Filing Date
- 2025-09-09
- Publication Date
- 2026-07-17
AI Technical Summary
The windward bearing of the wind turbine main shaft unit is difficult to disassemble and maintain due to the large radial load and flexural deformation it bears. In addition, the material cost is high, the wear is uneven, and the service life is affected.
The design incorporates segmented inner and outer rings, along with removable end caps and elastic elements. The bearing's removability is achieved through a window structure, and the disassembly process is simplified using the inner ring mounting structure and positioning blocks. The outer and inner ring sections can be removed separately.
It simplifies the disassembly and maintenance process of the upwind bearing, reduces material costs, extends the bearing's service life, and improves maintenance efficiency.
Smart Images
Figure CN224515318U_ABST
Abstract
Claims
1. A windmill main shaft unit, characterized by, include: The main shaft (100) includes an upwind side (110) and a downwind side (120). A bearing housing (200) is arranged to surround the main shaft (100), the bearing housing (200) including a first end (210) adjacent to the windward side (110) of the main shaft (100) and a second end (220) adjacent to the leeward side (120) of the main shaft (100). An upwind bearing adjacent to the main shaft (100) on the upwind side (110) and located between the main shaft (100) and the bearing housing (200), the upwind bearing comprising an inner ring arranged along the radial outer surface (130) of the main shaft (100) and an outer ring located on the radial outer surface of the inner ring. An upwind end cap is arranged adjacent to the first end (210) of the bearing housing (200) and the upwind side (110) of the main shaft (100) and restricts the axial movement of the upwind bearing during the operation of the wind turbine main shaft unit (10). The inner and / or outer rings of the upwind bearing are configured to be segmented in the circumferential direction, and the bearing housing (200) includes a window (230) corresponding to an inner ring segment of the segmented inner ring or an outer ring segment of the segmented outer ring, such that at least a portion of an inner ring segment of the segmented inner ring or at least a portion of an outer ring segment of the segmented outer ring can be removed through the window (230).
2. The windmill main shaft unit according to claim 1, characterized by Further includes: A leeward bearing (500) is arranged on the leeward side (120) of the main shaft (100) between the main shaft (100) and the bearing housing (200); and A leeward end cap (600) is arranged adjacent to the second end (220) of the bearing housing (200) and the leeward side (120) of the main shaft (100) and restricts the axial movement of the leeward bearing (500) during the operation of the wind turbine main shaft unit (10).
3. The windmill main shaft unit according to claim 2, characterized in that, The downwind bearing (500) is suspended and supported by the bearing housing (200) and the downwind end cap (600), and an elastic element (530) is provided between the bearing housing (200) and the downwind bearing (500), the elastic element (530) being configured to apply a biasing force toward the main shaft (100) to the downwind bearing (500).
4. The wind turbine main shaft unit according to claim 3, characterized in that: The downwind bearing (500) includes a plurality of bearing shells (510) arranged along the radial outer surface (130) of the main shaft (100), each bearing shell (510) including a bearing shell body (520), the bearing shell body (520) including an inner surface (521) facing the main shaft (100) and an outer surface (522) facing the bearing housing (200), wherein the bearing shell body (520) includes a first shoulder (523) extending from the bearing shell body (520) toward the upwind side (110) of the main shaft (100) and a second shoulder (524) extending toward the downwind side (120) of the main shaft (100) on the outer surface (522) of the bearing shell body (520). The bearing housing (200) has a first foot (250) for supporting the first shoulder (523) and the downwind end cap (600) has a second foot (610) for supporting the second shoulder (524).
5. The windmill main shaft unit according to claim 4, characterized in that, The outer surface (522) of the bearing body (520) is provided with a groove (525), and the elastic element (530) is held between the groove (525) and the bearing seat (200) and configured to apply a biasing force toward the main shaft (100) to the outer surface (522) of the bearing body (520).
6. The windmill main shaft unit according to any one of claims 1 to 5, characterized in that, The device further includes an inner ring mounting structure (140) arranged adjacent to the windward side (110) of the main shaft (100) and including a body (141) arranged around the radially outer surface (130) of the main shaft (100), the body (141) having a plurality of protrusions (142) spaced apart from each other and extending radially outward, and a positioning block (143) detachably attached to the body (141) between every two adjacent protrusions (142).
7. A windmill main shaft unit according to claim 6, characterized in that The inner ring is composed of multiple inner ring segments, each inner ring segment including a first bearing block (311) and a second bearing block (312) arranged axially side by side. The first bearing block (311) is detachably attached to the second bearing block (312) and / or the positioning block (143) and includes a radially outer surface in the form of a curved surface abutting the windward end cap, while the second bearing block (312) is arranged between the inner ring mounting structure (140) and the outer ring and includes a radially outer surface in the form of a curved surface abutting the outer ring.
8. The wind turbine main shaft unit (10) according to claim 7, characterized in that, The second bearing block (312) includes a second bearing block body (312a) located on the radially outer surface of the inner ring mounting structure (140) and an extension (312b) extending radially inward from the end of the second bearing block body (312a) away from the corresponding first bearing block (311) and contacting the inner ring mounting structure (140).
9. A windmill main shaft unit according to claim 8, characterized in that There is a gap between the first bearing block (311) and the main shaft (100) and there is a gap between the extension (312b) of the second bearing block (312) and the main shaft (100).
10. The windmill main shaft unit according to claim 7, characterized by The first bearing block (311) and the corresponding second bearing block (312) extend circumferentially across a portion of the circumferential extension of one of the multiple protrusions (142) of the inner ring mounting structure (140) and the two positioning blocks (143) adjacent to the protrusion.
11. A windmill main shaft unit according to any one of claims 1 to 5, characterized in that The outer ring has an opening (321) aligned with the window (230) such that at least a portion of an inner ring segment of the segmented inner ring can be taken out through the opening (321) and the window (230).
12. The windmill main shaft unit according to claim 7, characterized in that, The outer ring has an opening (321) aligned with the window (230) so that the second bearing block (312) can be removed through the opening (321) and the window (230).
13. The wind turbine main shaft unit according to claim 11, characterized in that, It further includes a bearing housing cover that is detachably attached to the bearing housing (200) and fills the window (230) and the opening (321).
14. The windmill main shaft unit according to any one of claims 1 to 5, characterized by, The windward end cap includes two halves (411, 421) detachably attached to each other, each half (411, 421) including an end cap body (412, 422) intended to abut against a first end (210) of the bearing housing (200) on the windward side (110) of the main shaft (100) and protrusions (413, 423) extending from the end cap body (412, 422) toward the bearing housing (200) to contact the bearing housing (200), the outer ring, and the inner ring, respectively.
15. The windmill main shaft unit according to any one of claims 1 to 5, characterized by, The inner ring is configured to surround the radial outer surface (130) of the main shaft (100) and have a curved radial outer surface.
16. A windmill main shaft unit according to claim 15, characterized in that The inner ring and the main shaft (100) are integrated.
17. The windmill main shaft unit according to claim 15, characterized in that, The outer ring is composed of multiple outer ring segments, each outer ring segment including: The outer ring section body (321') is positioned to contact the radial outer surface of the inner ring; A portion of the radially outer surface of the outer ring section body (321') extends radially outward and is positioned to contact the outer ring protrusion (322') of the bearing housing (200); and An insert (323') is detachably attached to the corresponding outer ring segment body (321') of each of two adjacent outer ring segments and contacts the bearing housing (200) between the outer ring protrusions (322') of each pair of adjacent outer ring segments.
18. The windmill main shaft unit according to claim 15, characterized in that, The windward end cap is configured to be switchable between a first state during which the wind turbine main shaft unit is in operation and a second state during which the wind turbine main shaft unit is not in operation. In the first state, a portion of the upper wind-side end cap is connected to the bearing housing (200), and the upper wind-side end cap is connected to the outer ring at a first position, causing the outer ring to disengage from the main shaft (100). In the second state, the windward end cap is connected to the outer ring at the second position, such that the outer ring is connected to the main shaft (100) via the windward end cap.
19. The wind turbine main shaft unit according to claim 18, characterized in that, The windward end cap includes: A fixing portion (410') arranged on the windward side (110) of the main shaft (100), surrounding the radial outer surface (130) of the main shaft (100), and fixed to the first end (210) of the bearing housing (200); and A radially outer surface (130) surrounding the main shaft (100) is arranged between the main shaft (100) and the fixed portion (410') and adjacent to the movable portion (420') of the inner and outer rings, the movable portion (420') being configured to switch between the first state and the second state.
20. The windmill main shaft unit according to claim 19, characterized in that, The movable part (420') is provided with a plurality of first positioning holes (421') and a plurality of second positioning holes (422') extending through it axially, and the outer ring (320') is provided with a plurality of receiving holes (325') aligned with the plurality of second positioning holes (422'). In the first state, the first set of fasteners are screwed into the plurality of first positioning holes (421') and abut against the outer ring (320'). The movable part (420') is connected to the outer ring at the first position, so that the outer ring (320') is disconnected from the main shaft (100) and is held in the axial direction between the movable part (420') and the bearing seat (200). In the second state, the first set of fasteners is removed and the second set of fasteners is screwed into the plurality of second positioning holes (422') and the corresponding plurality of receiving holes (325'), and the movable part (420') is connected to the outer ring at the second position.
21. The wind turbine main shaft unit according to claim 19 or 20, characterized in that, The movable part (420') is provided with a plurality of keyways (423'), and the radial outer surface (130) of the spindle (100) is provided with a plurality of spindle keyways (150) that are aligned with the plurality of keyways (423') of the movable part (420').
22. A windmill main shaft unit according to claim 19 or 20, characterised in that The radial inner surface of the fixed part (410') has a recess (411') adjacent to the bearing seat (200), while the radial outer surface of the movable part (420') has a protrusion (424') accommodated in the recess (411') and adjacent to the bearing seat (200), wherein the protrusion (424') is clearance-fitted with the recess (411').
23. The windmill main shaft unit according to claim 15, characterized by, When the windward end cap is removed, the outer ring is connected to the main shaft (100) by means of the removal device (20), and the outer ring and the removal device (20) are disconnected from the bearing seat (200).
24. The windmill main shaft unit according to claim 15, characterized by, It further includes a bearing housing cover that is detachably attached to the bearing housing (200) and fills the window (230).