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EP-4505096-B1 - GEARBOX

EP4505096B1EP 4505096 B1EP4505096 B1EP 4505096B1EP-4505096-B1

Inventors

  • WANG, Minzhu
  • LU, FENG

Dates

Publication Date
20260506
Application Date
20230309

Claims (10)

  1. A gearbox, comprising a pair of housings (100, 200), the pair of housings (100, 200) being respectively provided with a bearing block (120) protruding axially from an inner surface thereof, a radial inner surface of the bearing block (120) defining a bearing chamber (123) for accommodating a bearing, and at least one of the housings (100, 200) being provided with a lubricating assembly (300) on the inner surface thereof, wherein the lubricating assembly (300) comprises: an oil deflector (310) having a radial segment (311) extending from a radial outer surface of the bearing block (120) in a direction away from the radial outer surface, and a circumferential segment (312) extending from the radial segment (311) along the radial outer surface; and a middle oil guide rib (320) intersecting with the radial outer surface of the bearing block (120) and being provided with, at the intersection, an oil inlet hole providing access to the bearing chamber (123), wherein the oil inlet hole is located on a lower side of the oil deflector (310), the circumferential segment (312) extends towards the oil inlet hole, and a portion of the middle oil guide rib (320) adjacent to the oil inlet hole is located on an upper side of the oil inlet hole.
  2. The gearbox according to claim 1, wherein the axial width of the oil deflector (310) is greater than the axial width of the bearing block (120).
  3. The gearbox according to claim 2, wherein the circumferential segment (312) of the oil deflector (310) is spaced apart from the oil inlet hole.
  4. The gearbox according to claim 1, wherein a portion of the bearing chamber (123) adjacent to a bottom (124) thereof forms an oil collecting chamber (125) for accommodating lubricating oil, and the oil inlet hole provides access to the oil collecting chamber (125).
  5. The gearbox according to claim 4, wherein the radial inner surface of the bearing block (120) is provided with a recess, and the recess defines an auxiliary chamber (126) in fluid communication with the oil inlet hole and the oil collecting chamber (125).
  6. The gearbox according to any one of claims 1 to 5, wherein the bearing block (120) is a first bearing block (121), the oil inlet hole is a first oil inlet hole (321), the pair of housings (100, 200) are further respectively provided with a second bearing block (122) axially protruding from the inner surface thereof, the middle oil guide rib (320) further intersects with a radial outer surface of the second bearing block (122), and is provided with, at the intersection, a second oil inlet hole (322) providing access to a bearing chamber of the second bearing block (122), and a portion of the middle oil guide rib (320) adjacent to the second oil inlet hole (322) is located on an upper side of the second oil inlet hole (322).
  7. The gearbox according to claim 6, wherein the middle oil guide rib (320) extends upwardly from the first oil inlet hole (321) to the second oil inlet hole (322) and extends upwardly from the second oil inlet hole (322) to a tail end (323).
  8. The gearbox according to claim 6, wherein the middle oil guide rib (320) has a protruding portion (324), and the middle oil guide rib (320) extends upwardly from the first oil inlet hole (321) to the protruding portion (324) and extends downwardly from the protruding portion (324) to the second oil inlet hole (322).
  9. The gearbox according to claim 6, wherein the lubricating assembly (300) further comprises a side oil guide rib (330), the side oil guide rib (330) intersects with the radial outer surface of the second bearing block (122) and is provided with, at the intersection, a third oil inlet hole (331) providing access to the bearing chamber of the second bearing block (122), and the side oil guide rib (330) extends upwardly from the third oil inlet hole (331).
  10. The gearbox according to any one of claims 1-5, wherein the lubricating assembly (300) is an integrated part of the housings (100, 200).

Description

TECHNICAL FIELD The present invention relates to the technical field of mechanical transmission, and more particularly, relates to a gearbox. BACKGROUND A gearbox is a common transmission device that generally changes parameters, such as a torque transmitted from a driving shaft to a driven shaft, a rotating speed, and a movement direction, under different operating conditions. Conventional gearboxes generally adopt a splash lubrication method, i.e., a certain amount of lubricating oil is stored in a gearbox housing, lubricating oil liquid is rolled up to be splashed onto relevant parts needing to be lubricated, such as a gear, a shaft and a bearing, when a gear pair of the gearbox rotates. However, because the structure of the gearbox is generally complex, there are several blind zones of lubrication that cannot be sufficiently lubricated, e.g., a bearing contained in the housing. Particularly, when the gear pair operates at a high speed, splash lubrication usually cannot meet lubrication requirements of the blind zones of lubrication, thereby directly causing low lubrication efficiency, and shortening the service life of relevant parts. In order to address this problem, the existing technologies for designing a lubrication system of a gearbox mostly adopts a solution of mounting an additional device in the gearbox. Although the device can solve the lubrication problem to a certain extent, it increases the weight of the gearbox and the complexity of assembling, and also reduces the space in the gearbox and deteriorates heat dissipation performance, thereby affecting the overall efficiency of the gearbox. Gearboxes are known in the prior art. For example, EP 3 869 070 A1 describes a gear system having a structure in which oil churned by a gear is properly dispensed to at least one of a hollow space or a bearing, thereby effectively lubricating components, wherein the gear system may include a first shaft, and an oil guide plate interposed between the first shaft and a housing surrounding the first shaft and dispensing oil churned by a gear to a hollow space of the first shaft and a bearing coupled to the first shaft. Accordingly, there is a need to provide a lubrication system for a gearbox, which solves the problem that it is difficult for lubricating blind zones in the gearbox to obtain sufficient lubricating oil basically without increasing the weight of the gearbox and reducing the internal space of the gearbox. SUMMARY In order to solve the problems in the prior art described above, the present invention proposes a gearbox, comprising a pair of housings, the pair of housings being respectively provided with a bearing block protruding axially from an inner surface thereof, a radial inner surface of the bearing block defining a bearing chamber for accommodating a bearing, and at least one of the housings being provided with a lubricating assembly on the inner surface thereof, wherein the lubricating assembly comprises an oil deflector having a radial segment extending from a radial outer surface of the bearing block in a direction away from the radial outer surface, and a circumferential segment extending from the radial segment along the radial outer surface; and a middle oil guide rib intersecting with the radial outer surface of the bearing block and being provided with, at the intersection, an oil inlet hole providing access to the bearing chamber, wherein the oil inlet hole is located on a lower side of the oil deflector, the circumferential segment extends towards the oil inlet hole, and a portion of the middle oil guide rib adjacent to the oil inlet hole is located on an upper side of the oil inlet hole. According to an optional embodiment of the present invention, the axial width of the oil deflector is greater than the axial width of the bearing block. According to an optional embodiment of the present invention, the circumferential segment of the oil deflector is spaced apart from the oil inlet hole. According to an optional embodiment of the present invention, a portion of the bearing chamber adjacent to a bottom thereof forms an oil collecting chamber for accommodating lubricating oil, and the oil inlet hole provides access to the oil collecting chamber. According to an optional embodiment of the present invention, the radial inner surface of the bearing block is provided with a recess, and the recess defines an auxiliary chamber in fluid communication with the oil inlet hole and the oil collecting chamber. According to an optional embodiment of the present invention, the bearing block is a first bearing block, the oil inlet hole is a first oil inlet hole, the pair of housings are further respectively provided with a second bearing block axially protruding from the inner surface thereof, the middle oil guide rib further intersects with a radial outer surface of the second bearing block, and is provided with, at the intersection, a second oil inlet hole providing access to a bearing chamber of