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US-20260126111-A1 - LUBRICATION STRUCTURE

US20260126111A1US 20260126111 A1US20260126111 A1US 20260126111A1US-20260126111-A1

Abstract

A lubrication structure includes a shaft having therein the oil passage, which is bottomed, extending in an axial direction, and a pipe that is open at both ends and disposed in the oil passage along the shaft. The shaft includes discharge channels open at an outer circumference of the shaft and extending from the oil passage toward an outer side in a radial direction. The discharge channels are provided to be spaced from each other in the axial direction. The pipe includes a partition provided on an outer circumference of the pipe, and the partition is located between openings of adjacent ones of the discharge channels and is in contact with an inner surface of the oil passage.

Inventors

  • Tomoyuki Hara
  • Takaaki Onoda
  • Masaki Yoshikane
  • Masanori Nagata

Assignees

  • UNIVANCE CORPORATION

Dates

Publication Date
20260507
Application Date
20221003

Claims (4)

  1. 1 . A lubrication structure comprising: a shaft that has therein an oil passage having a bottom and extending in an axial direction; and a pipe that is open at both ends and that is disposed in the oil passage along the shaft, wherein the shaft includes a plurality of discharge channels extending from the oil passage toward an outer side in a radial direction, and being open at an outer circumference of the shaft, the plurality of discharge channels are provided so as to be spaced from each other in the axial direction, the pipe includes a partition provided on an outer circumference of the pipe, and the partition is located between openings of adjacent ones of the plurality of discharge channels, and is in contact with the oil passage.
  2. 2 . The lubrication structure according to claim 1 , wherein the pipe includes a spacer provided on the outer circumference of the pipe so as to be spaced from the partition in the axial direction, and the spacer is in contact with the oil passage, and includes a hole through which oil passes.
  3. 3 . The lubrication structure according to claim 1 wherein the oil passage has bottoms at both ends in the axial direction, the shaft includes an injection channel extending from the oil passage toward the outer side in the radial direction and being open at the outer circumference of the shaft, and the pipe includes a first cut which is an obliquely cut part of a first end.
  4. 4 . The lubrication structure according to claim 3 , wherein the pipe includes a second cut which is an obliquely cut part of a second end.

Description

TECHNICAL FIELD The present invention relates to a lubrication structure in which an oil passage through which lubricating oil flows is provided in a shaft. BACKGROUND ART For a lubrication structure in which a bottomed oil passage through which lubricating oil flows, and a plurality of discharge channels for discharging the oil from the oil passage are provided in a shaft, Patent Document 1 discloses a conventional art for disposing a pipe press-fitted in a bush into an oil passage. In the conventional art, the bush is press-fitted between an injection channel for injecting oil into the oil passage and discharge channels, and the pipe is disposed in the oil passage such that oil makes a detour to all the discharge channels. The entire amount of the oil injected in the oil passage through the injection channel flows in the pipe, and the oil makes a detour to all the discharge channels, and then sequentially exits the oil passage through ends of the discharge channels to lubricate devices disposed around the shaft. PRIOR ART DOCUMENT Patent Document Patent Document 1: Japanese Patent Application Laid-Open (kokai) No. H9-177949 SUMMARY OF THE INVENTION Problem to be Solved by the Invention In the conventional art, since oil makes a detour to all the discharge channels and then sequentially exits the oil passage through the ends of the discharge channels, the amount of oil that exits the oil passage through the discharge channel that the oil reaches last (in other words, the amount of oil that exits the oil passage through the discharge channel on an injection side) is insufficient in some cases. The present invention has been made in order to solve this problem, and an object of the present invention is to provide a lubrication structure capable of ensuring the amount of oil that exits an oil passage through a discharge channel. Means for Solving the Problem In order to attain this object, a lubrication structure of the present invention includes a shaft that has therein an oil passage having a bottom and extending in an axial direction, and a pipe that is open at both ends and that is disposed in the oil passage along the shaft. The shaft includes a plurality of discharge channels extending from the oil passage toward an outer side in a radial direction and being open at an outer circumference of the shaft, and the plurality of discharge channels are provided so as to be spaced from each other in the axial direction. The pipe includes a partition provided on an outer circumference of the pipe, and the partition is located between openings of adjacent ones of the plurality of discharge channels and is in contact with an inner surface of the oil passage. Advantageous Effects of the Invention According to a first aspect, the partition provided on the outer circumference of the pipe is located between the openings of the adjacent ones of the plurality of discharge channels provided so as to be spaced from each other in the axial direction. Through one of the adjacent discharge channels separated by the partition, oil having flowed through the pipe is discharged, and, through the other one of the discharge channels, oil having flowed between the oil passage and the pipe is discharged. Since oil flows inside and outside of the pipe in parallel toward the partition, and sequentially exits the oil passage through the discharge channels in two directions, insufficiency in the amount of oil that exits the oil passage through the discharge channel that the oil reaches last can be prevented. Thus, the amount of oil that exits the oil passage through the discharge channel can be ensured. According to a second aspect, in the first aspect, a spacer provided on the outer circumference of the pipe so as to be spaced from the partition in the axial direction is in contact with the oil passage and includes a hole through which oil passes. Since the pipe is supported at at least two points, that is, the partition and the spacer, the pipe can be prevented from oscillating with respect to the partition in the oil passage. According to a third aspect, in the first aspect or the second aspect, the oil passage has bottoms at both ends in the axial direction. An injection channel extends from the oil passage toward the outer side in the radial direction and is open at the outer circumference of the shaft, and the pipe includes a first cut which is an oblique cut portion of the first end. Even if the end of the pipe is in contact with the bottom of the oil passage, oil enters the pipe through the first cut from the injection channel. Thus, the position in the axial direction of the pipe need not be fixed so as to prevent a case where oil is hindered from entering the pipe when the end of the pipe is in contact with the bottom of the oil passage. According to a fourth aspect, in the third aspect, the pipe includes a second cut which is an oblique cut part of a second end. Even if an end of the pipe is in contact with the bottom of the