Lubricating structure for speed reducer

Patent metadata

Field	Value
Publication number	US-9897192-B2
Application number	US-201514926353-A
Country	US
Kind code	B2
Filing date	Oct 29, 2015
Priority date	Oct 30, 2014
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

A lubricating structure for a speed reducer includes: a case; a first reduction gear pair provided inside the case; a second reduction gear pair provided inside the case; a first catch tank arranged inside the case; a second catch tank arranged inside the case; a partition member that includes a partition wall that partitions an inside of the case into a first accommodation space in which the first reduction gear pair is accommodated and a second accommodation space in which the second reduction gear pair is accommodated; a first oil passage communicating with the first accommodation space and configured to guide lubricating oil to the first catch tank; a second oil passage communicating with the second accommodation space and configured to guide lubricating oil to the second catch tank; and a communication port provided in the partition member and communicating the first oil passage with the second oil passage.

First claim

What is claimed is:

1. A lubricating structure for a speed reducer, the lubricating structure comprising:
a case;
a first reduction gear pair provided inside the case, the first reduction gear pair being configured to rotate interlocking with an output shaft of a drive source, the first reduction gear pair including a first drive gear and a first driven gear that is in mesh with the first drive gear;
a second reduction gear pair provided inside the case and arranged so as to be displaced in a rotation axis direction of the first reduction gear pair with respect to the first reduction gear pair, the second reduction gear pair including a second drive gear and a second driven gear that is in mesh with the second drive gear and that is lower in rotation speed than the first driven gear;
a first catch tank arranged inside the case;
a second catch tank arranged inside the case;
a partition member that is a component of the case, the partition member including a partition wall that partitions an inside of the case into a first accommodation space in which the first reduction gear pair is accommodated and a second accommodation space in which the second reduction gear pair is accommodated;
a first oil passage communicating with the first accommodation space, the first oil passage being configured to guide lubricating oil, stored at a bottom in the case and scooped up by the first driven gear, to the first catch tank;
a second oil passage communicating with the second accommodation space, the second oil passage being configured to guide lubricating oil, stored at the bottom in the case and scooped up by the second driven gear, to the second catch tank; and
a communication port provided in the partition member and communicating the first oil passage with the second oil passage, wherein
the case includes the partition member, a first split case portion fixed to one side of the partition member and including a first side wall that defines the first accommodation space, and a second split case portion fixed to the other side of the partition member and including a second side wall that defines the second accommodation space,
the first oil passage is radially defined by an outer periphery of a first oil passage wall extending from the first side wall and an outer peripheral wall of the first split case portion, and
the second oil passage is radially defined by an outer periphery of a second oil passage wall extending from the second side wall and an outer peripheral wall of the second split case portion.

2. The lubricating structure according to claim 1 , wherein
the second split case portion includes a weir on the outer periphery of the second oil passage wall, and the weir is able to guide the lubricating oil, scooped up to the second oil passage, to the communication port.

3. The lubricating structure according to claim 2 , wherein
the weir is an ejector pin seat of the second split case portion.

4. The lubricating structure according to claim 1 , wherein
the second catch tank is radially defined by the outer periphery of the second oil passage wall, an outer periphery of a tank wall extending from the partition wall, the outer peripheral wall of the second split case portion and an outer peripheral wall of the partition member.

5. The lubricating structure according to claim 1 , wherein
the second catch tank has a drain hole at its bottom, and the drain hole is configured to drain lubricating oil.

6. The lubricating structure according to claim 1 , wherein
the drive source is an electric motor,
the first reduction gear pair is provided between the output shaft and a counter shaft parallel to the output shaft,
the second reduction gear pair is provided between the counter shaft and a differential case parallel to the counter shaft and accommodating a differential mechanism configured to drive a pair of axles to rotate,
the first driven gear is a counter driven gear that is a larger diameter one of the first reduction gear pair and that is fixed to the counter shaft,
the second driven gear is a final driven gear fixed to the differential case, and
the second catch tank is provided at a position within a projected area of an accommodation space of the counter driven gear in a rotation axis direction of the counter driven gear on an outer peripheral side of the second drive gear.

7. The lubricating structure according to claim 1 , wherein the first oil passage and the second oil passage are provided at positions that overlap with each other when viewed in the rotation axis direction of the first reduction gear pair.

8. A lubricating structure for a speed reducer, the lubricating structure comprising:
a case;
a first reduction gear pair provided inside the case, the first reduction gear pair being configured to rotate interlocking with an output shaft of a drive source, the first reduction gear pair including a first drive gear and a first driven gear that is in mesh With the first drive gear;
a second reduction gear pair provided inside the case and arranged so as to be displaced in a rotation axis direction of the first reduction gear pair with respect to the first reduction gear pair, the second reduction gear pair including a second drive gear and a second driven gear that is in mesh with the second drive gear and that is lower in rotation speed than the first driven gear;
a first catch tank arranged inside the case;
a second catch tank arranged inside the case;
a partition member that is a component of the case, the partition member including a partition wall that partitions an inside of the case into a first accommodation space in which the first reduction gear pair is accommodated and a second accommodation space in which the second reduction gear pair is accommodated;
a first oil passage communicating with the first accommodation space, the first oil passage being configured to guide lubricating oil, stored at a bottom in the case and scooped up by the first driven gear, to the first catch tank;
a second oil passage communicating with the second accommodation space, the second oil passage being configured to guide lubricating oil, stored at the bottom in the case and scooped up by the second driven gear, to the second catch tank; and
a communication port provided in the partition member and communicating the first oil passage with the second oil passage,
wherein the second oil passage is radially defined by an outer peripheral wall of the second accommodation space and an outer periphery of an oil passage wall, and
wherein the second oil passage includes a weir on the outer periphery of the oil passage wall that changes a direction of a portion of the lubricating oil, scooped up to the second oil passage, toward the communication port.

9. The lubricating structure according to claim 8 , wherein the portion of the lubricating oil, scooped up to the second oil passage, is merged into the first oil passage via the communication port.

Assignees

• Aisin Seiki
• Toyota Motor Co Ltd

Inventors

• Tahara Yasuaki
• Nonaka Noriaki
• Ashihara Yoshifumi
• Mikami Jun
• Ito Satori
• Kosaka Daichi
• Ikushima Yoshihiro
• Michishita Masaya
• Kajikawa Atsushi

Classifications

• F16H57/0421

  on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like · CPC title

• F16H57/0452

  Oil pans · CPC title

• F16H57/048

  Type of gearings to be lubricated, cooled or heated · CPC title

• F16H57/0457

  Splash lubrication · CPC title

• F16H57/045

  Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case · CPC title