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EP-4467829-B1 - WIND TURBINE PLANET GEAR SHAFT AND WIND TURBINE PLANET GEAR STRUCTURE

EP4467829B1EP 4467829 B1EP4467829 B1EP 4467829B1EP-4467829-B1

Inventors

  • ZHOU, JING
  • CHEN, YUAN
  • ZHANG, Yabin
  • Lu, Xueliang
  • ZHU, JIE
  • LUO, Bi
  • ZHOU, SHAOHUA
  • Qian, Weihua
  • ZHU, He
  • ZHU, JINGUANG
  • LI, DAPENG
  • Wei, Jeffrey
  • SHEN, BO
  • YANG, ZHI
  • BAI, Zunyang

Dates

Publication Date
20260506
Application Date
20240508

Claims (9)

  1. Wind turbine planet gear shaft, comprising a shaft body (1), a radial sliding bearing (2), an oil supply component (3) for supplying oil to a surface of the radial sliding bearing (2), and an oil return component (4) for carrying away heat of the radial sliding bearing (2), characterized in that the oil supply component (3) comprises an oil supply channel (31) and a single oil pocket (32) in communication with each other, the single oil pocket (32) being disposed on a surface of a non-load-bearing zone (21) of the radial sliding bearing (2); the oil return component (4) is located on a surface of the radial sliding bearing (2), and comprises two oil discharge grooves (41) respectively disposed at two sides in a length direction of the single oil pocket (32), two ends of each said oil discharge groove (41) being in communication with the single oil pocket (32) and external air, respectively, characterized in that the oil supply channel (31) comprises a radial main oil feed segment (312), an axial oil supply segment (311) and a radial oil supply segment (314), which are sequentially in communication with each other; an oil feed end of the radial main oil feed segment (312) is located at an outer surface at an end of the shaft body (1), the axial oil supply segment (311) is located on a central axis of the shaft body (1), and the radial oil supply segment (314) is in communication with the single oil pocket (32).
  2. Wind turbine planet gear shaft according to Claim 1, characterized in that the oil supply channel (31) further comprises a radial auxiliary oil feed segment (313), one end of the radial auxiliary oil feed segment (313) being disposed on the surface of the non-load-bearing zone (21) of the radial sliding bearing (2), and another end of the radial auxiliary oil feed segment (313) being in communication with the axial oil supply segment (311).
  3. Wind turbine planet gear shaft according to Claim 2, characterized in that the radial auxiliary oil feed segment (313) is located at a central position in a length direction of the radial sliding bearing (2).
  4. Wind turbine planet gear shaft according to Claim 3, characterized in that at least two said radial auxiliary oil feed segments (313) are provided, the radial auxiliary oil feed segments (313) being arranged spaced apart in a circumferential direction of the shaft body (1).
  5. Wind turbine planet gear shaft according to any one of Claims 2 - 4, characterized in that a conical hole (315) is provided at an oil feed end of the radial auxiliary oil feed segment (313).
  6. Wind turbine planet gear shaft according to any one of Claims 1 - 4, characterized in that one end of the axial oil supply segment (311) is a sealed end disposed inside the shaft body (1), and another end is a threaded open end in communication with the outside, with a threaded plug (5) being screwed into the threaded open end.
  7. Wind turbine planet gear shaft according to any one of Claims 1 - 4, characterized in that the radial sliding bearing (2) is an alloy wear-resistant bearing, which is formed on an outer surface of the shaft body (1) by laser cladding.
  8. Wind turbine planet gear structure, comprising a planet gear (6) and a planet carrier, characterized by comprising the wind turbine planet gear shaft according to any one of Claims 1 - 7, the planet gear (6) being fitted round the wind turbine planet gear shaft, and the wind turbine planet gear shaft being fixedly mounted to the planet carrier (7).
  9. Wind turbine planet gear structure according to Claim 8, characterized in that the planet carrier (7) is provided with an oil feed channel (71) in communication with the oil supply channel (31); and an end-to-end-connecting oil feed groove (33), ensuring effective delivery of oil, is provided at an end of the oil supply channel (31) which is in communication with the oil feed channel (71).

Description

Technical field The present invention relates to the field of wind turbine planet gears, in particular to a wind turbine planet gear shaft and a wind turbine planet gear structure. Background art A wind turbine planet wheel is an important component of a wind turbine gearbox, mainly comprising a planet gear shaft, a planet gear, a radial sliding bearing, a thrust sliding bearing, bearing lubrication oil feed/return components, etc. The planet gear shaft is fixedly mounted on a planet carrier of the wind turbine gearbox; the planet gear is meshed with an outer ring gear and a sun gear of the wind turbine gearbox; the radial sliding bearing supports the planet gear on the planet gear shaft; a bearing lubrication and oil feed/return structure is disposed on the planet gear shaft and the radial sliding bearing, and used to reduce wear between the planet gear shaft and the planet gear, and carry away heat produced by friction. However, an existing oil return component is generally disposed inside a shaft body, and oil which has increased in temperature must be discharged through an oil return channel inside the shaft body, but this makes the oil return component structurally complex, so processing thereof is complicated; moreover, the configuration of oil supply and oil return components in an existing wind turbine planet gear shaft alters the internal pressure distribution of the radial sliding bearing, and this greatly reduces the load-bearing ability of the radial sliding bearing, thus reducing the reliability of operation of the wind turbine planet gear structure. EP 3 091 242 A1 discloses a wind turbine planet gear shaft according to the preamble of claim 1. Summary of the invention The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, by providing a wind turbine planet gear shaft and a wind turbine planetary gear structure which have good load-bearing ability, a simple oil return structure and a good cooling effect. To solve the abovementioned technical problems, the present invention proposes the following technical solution: A wind turbine planet gear shaft, comprising a shaft body, a radial sliding bearing, an oil supply component for supplying oil to a surface of the radial sliding bearing, and an oil return component for carrying away heat of the radial sliding bearing; the oil supply component comprises an oil supply channel and a single oil pocket in communication with each other, the single oil pocket being disposed on a surface of a non-load-bearing zone of the radial sliding bearing; the oil return component is located on a surface of the radial sliding bearing, and comprises two oil discharge grooves respectively disposed at two sides in a length direction of the single oil pocket, two ends of each said oil discharge groove being in communication with the single oil pocket and external air, respectively. As a further improvement of the above technical solution: The oil supply channel comprises a radial main oil feed segment, an axial oil supply segment and a radial oil supply segment, which are sequentially in communication with each other; an oil feed end of the radial main oil feed segment is located at an outer surface at an end of the shaft body, the axial oil supply segment is located on a central axis of the shaft body, and the radial oil supply segment is in communication with the single oil pocket. The oil supply channel further comprises a radial auxiliary oil feed segment, one end of the radial auxiliary oil feed segment being disposed on the surface of the non-load-bearing zone of the radial sliding bearing, and another end of the radial auxiliary oil feed segment being in communication with the axial oil supply segment. The radial auxiliary oil feed segment is located at a central position in a length direction of the radial sliding bearing. At least two said radial auxiliary oil feed segments are provided, the radial auxiliary oil feed segments being arranged spaced apart in a circumferential direction of the shaft body. A conical hole is provided at an oil feed end of the radial auxiliary oil feed segment. One end of the axial oil supply segment is a sealed end disposed inside the shaft body, and another end is a threaded open end in communication with the outside, with a threaded plug being screwed into the threaded open end. The radial sliding bearing is an alloy wear-resistant bearing, which is formed on an outer surface of the shaft body by laser cladding. A wind turbine planet gear structure, comprising a planet gear, a planet carrier, and a wind turbine planet gear shaft as described above, the planet gear being fitted round the wind turbine planet gear shaft, and the wind turbine planet gear shaft being fixedly mounted to the planet carrier. As a further improvement of the above technical solution: The planet carrier is provided with an oil feed channel in communication with the oil supply channel; and an end-to-end-con