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DE-102025109796-B3 - Lubrication structure for a planetary gear device

DE102025109796B3DE 102025109796 B3DE102025109796 B3DE 102025109796B3DE-102025109796-B3

Abstract

Lubrication structure for a planetary gear device, comprising a planet gear shaft (10) which has: a first discharge opening (11) defined in the planet gear shaft (10) in a direction towards a sun gear (20), and a second discharge opening (12) defined in the planet gear shaft (10) in a direction opposite to the sun gear (20), and an oil guide device (30) coupled to the planet gear shaft (10) and configured to guide collected oil (O) to the first discharge opening (11) or the second discharge opening (12).

Inventors

  • Kim Tae Hoon

Assignees

  • HYUNDAI TRANSYS INC.

Dates

Publication Date
20260513
Application Date
20250314

Claims (9)

  1. Lubrication structure for a planetary gear device, wherein the lubrication structure comprises: a planet gear shaft (10) having: a first discharge opening (11) defined in the planet gear shaft (10) in a direction towards a sun gear (20), and a second discharge opening (12) defined in the planet gear shaft (10) in a direction opposite to the sun gear (20), and an oil guide device (30) coupled to the planet gear shaft (10) and configured to guide collected oil (O) to the first discharge opening (11) or the second discharge opening (12), wherein the oil guide device (30) has: a first annular section (31) arranged adjacent to the planet gear shaft (10), a second annular section (32) arranged at a distance from the first annular section (31), and a pipe section (33) which projects from a surface of the first ring section (31) in a direction towards the planet gear axis (10) and is positioned in the planet gear axis (10), wherein an inner side of the pipe section (33) is divided by a partition (331) into a first passage (332) which is adjacent to the first discharge opening (11) and a second passage (333) which is adjacent to the second discharge opening (12).
  2. Lubrication structure according to Claim 1 , wherein a first collecting section (34) which is connected to the first passage (332) from an inner diameter section of the first ring section (31) and an inner diameter section of the second ring section (32), and a second collecting section (35) which is connected to the second passage (333) from an outer diameter section of the first ring section (31) and an outer diameter section of the second ring section (32), are defined by the distance between the first ring section (31) and the second ring section (32).
  3. Lubrication structure according to Claim 2 , wherein the sun gear (20) has at least one first oil opening (21) and one second oil opening (41), wherein the second oil opening (41) connects the at least one first oil opening (21) and the first collecting section (34), and the second oil opening (41) is defined in a section of a carrier (40) positioned between the sun gear (20) and the planet gear axis (10).
  4. Lubrication structure according to Claim 3 , wherein the lubrication structure is configured to supply the oil (O) introduced into the at least one first oil opening (21) via the second oil opening (41), the first collecting section (34) and the first passage (332) through the second discharge opening (12) to a lubrication destination.
  5. Lubrication structure according to one of the Claims 2 until 4 , wherein the lubrication structure is configured to supply the oil (O) introduced into the second collecting section (35) via the second passage (333) through the first discharge opening (11) to a lubrication destination.
  6. Lubrication structure according to Claim 4 or after Claim 4 and 5 , where the lubrication target is a bearing (50) or a planetary gear (60).
  7. Lubrication structure according to one of the Claims 1 until 6 , wherein a bearing (50) is coupled to an outer diameter section of the planet gear shaft (10), a planet gear (60) is coupled to an outer diameter section of the bearing (50), and the planet gear (60) is rotatable about the sun gear (20) in a state in which an outer diameter section of the planet gear (60) is engaged with an outer diameter section of the sun gear (20).
  8. Lubrication structure according to Claim 7 , wherein a ring gear is coupled such that it surrounds the planet gear (60), and an inner diameter section of the ring gear is configured to engage with the outer diameter section of the planet gear (60).
  9. Lubrication structure according to one of the Claims 1 until 8 , wherein a coupling bolt (80) is configured such that it is coupled to a carrier (40) and the planet gear axle (10) from an outside of the carrier (40) in a state in which one end of the planet gear axle (10) is inserted into the carrier (40).

Description

The invention relates to a lubrication structure for a planetary gear device. In general, a lubrication device for an automatic transmission may comprise: a planetary gear section (e.g., pinion section) comprising: a planetary gear shaft and a planetary gear (e.g., pinion) configured to enclose the planetary gear shaft; a ring gear section configured to mesh with the planetary gear; a first thrust bearing coupled to the ring gear section; a second thrust bearing located on/at one side of the planetary gear; an oil guide coupled to the planetary gear shaft and configured to guide oil distributing from the first thrust bearing to the planetary gear shaft; a sun gear configured to mesh with the planetary gear and comprising: a first oil opening section through which the oil passes, and a second oil opening section configured to supply the oil to the second thrust bearing; and a carrier coupled to the planetary gear shaft and comprising: a third oil opening section configured to supply the oil from the first to receive the oil opening section and supply the oil to the first thrust bearing, and a fourth oil opening section configured to receive the oil from the second thrust bearing and supply the oil to the oil guide. In the event that the carrier cannot rotate or the carrier is stopped in a certain gear position of the automatic transmission without rotating, the oil distributed from a central axis in the lubrication device for an automatic transmission, according to the state of the art, is not supplied to the bearing via the oil guide, which damages (e.g. surface) a surface of the bearing (flakes off). A patent document relating to the state of the art is the Korean patent application. KR 10 2021 0 049 483 A (Published on May 6, 2021). From the DE 103 09 666 A1 A lubrication structure for a planetary gear device is known, wherein the lubrication structure comprises: a planet gear shaft having: a first drain opening defined in the planet gear shaft in a direction towards a sun gear, and a second drain opening defined in the planet gear shaft in a direction opposite to the sun gear, and an oil guide device coupled to the planet gear shaft and configured to guide collected oil to the first drain opening or the second drain opening. Further lubrication structures are known from the DE 10 2008 000 900 A1 , the DE 10 2018 114 760 A1 , the JP 2010 - 071 400 A, the KR 10 2004 0 032 392 A , the DE 10 2019 108 050 A1 and the JP 2010 - 156 414 A known. The invention provides a lubrication structure for a planetary gear device that is suitable for gently supplying oil collected by an oil guide device to a lubrication target via a first discharge opening or a second discharge opening of a planetary gear shaft, regardless of whether a carrier is stopped. According to the invention, a lubrication structure for a planetary gear device is provided, wherein the lubrication structure comprises: a planet gear shaft (e.g., a pinion shaft) having: a first drain opening drilled in the planet gear shaft in a direction towards a sun gear, and a second drain opening drilled in the planet gear shaft in a direction opposite to the sun gear, and an oil guide device coupled to the planet gear shaft and configured to guide collected oil to the first drain opening or the second drain opening. Furthermore, the oil guide device comprises: a first ring section arranged adjacent to the planet gear axis, a second ring section provided at a distance from the first ring section, and a pipe section projecting from a surface of the first ring section in a direction towards the planet gear axis and inserted into the planet gear axis, and the inside of the pipe section may be divided/subdivided by a partition into a first passage arranged adjacent to the first discharge opening and a second passage arranged adjacent to the second discharge opening. Furthermore, a first collecting section, which is connected to the first passage from an inner diameter section of the first ring section and an inner diameter section of the second ring section, and a second collecting section, which is connected to the second passage from an outer diameter section of the first ring section and an outer diameter section of the second ring section, can be defined by the distance between the first ring section and the second ring section. Furthermore, the sun wheel can have at least one first oil opening, and a second oil opening, which connects the first oil opening and the first collecting section, can be defined in a section of a support that is between is positioned between the sun gear and the planet gear axis. Furthermore, the oil introduced into the first oil opening can be directed to a lubrication target via the second oil opening, the first collecting section and the first passage through the second discharge opening. Furthermore, the oil introduced into the second collection section can be directed to a lubrication target via the second passage through the first