Power transmission device

Patent metadata

Field	Value
Publication number	US-9366332-B2
Application number	US-201414452023-A
Country	US
Kind code	B2
Filing date	Aug 5, 2014
Priority date	Mar 29, 2012
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A power transmission device includes a casing, a first shaft, and a second shaft, wherein the first shaft has a protruding portion which protrudes from the casing, a fan is provided at the protruding portion, a fan cover configured to cover the fan has an extending portion which extends toward a bearing supporting portion of the second shaft along a side surface of the casing, and the extending portion is inclined so as to approach the side surface of the casing toward the bearing supporting portion side from the fan side.

First claim

What is claimed is:

1. A power transmission device comprising:
a casing;
a first shaft; and
a second shaft,
wherein the first shaft comprises a protruding portion which protrudes from the casing,
a fan is provided at the protruding portion,
a fan cover configured to cover the fan comprises a base end section and an extending portion which extends toward a bearing supporting portion of the second shaft along a side surface of the casing, and
the extending portion is a separate member from the base end section, is connected at a joining portion to the base end section in a cantilever state, and is inclined toward the bearing supporting portion side from the fan side such that a distance defined perpendicularly from an axial center of the fan to the extending portion distant from the joining portion is smaller than a distance defined perpendicularly from the axial center to the extending portion proximate to the joining portion.

2. The power transmission device according to claim 1 , wherein a fin is provided on an inner surface of the extending portion or the side surface of the casing.

3. The power transmission device according to claim 2 , wherein as the fin, plural kinds of fin in which lengths in a direction toward the second shaft are different from each other are provided.

4. The power transmission device according to claim 3 , wherein as the plural kinds of fins, a fin in which a length in the direction toward the second shaft is short is disposed in the middle, and fins in which a length in the direction toward the second shaft is long are disposed on both sides.

5. The power transmission device according to claim 1 , wherein the base end section is parallel to the axial center or is inclined so as to become more distant from the axial center.

6. The power transmission device according to claim 5 , wherein the extending portion of the fan cover has a longer length in an axial direction of the first shaft than the base end section.

7. The power transmission device according to claim 1 , wherein also on a surface other than the side surface of the casing, another extending portion extends from the fan cover.

8. The power transmission device according to claim 1 , wherein the base end section includes a vertical surface having a vertical edge parallel to the side surface of the casing, a horizontal surface having a horizontal edge parallel to upper and lower surfaces of the casing, and a connection surface connecting the vertical surface and the horizontal surface, and the extending portion is connected to the vertical surface.

9. The power transmission device according to claim 1 , wherein the extending portion includes an inclined portion which is inclined toward the bearing supporting portion side from the fan side so as to approach the side surface of the casing and a bent portion which is formed adjacent to the inclined portion and prevents an air flow from diffusing.

10. The power transmission device according to claim 2 , wherein the extending portion includes the fin and is not in contact with the casing.

11. The power transmission device according to claim 2 , wherein a height of the fin becomes lower as the fin approaches the bearing supporting portion.

Assignees

• Sumitomo Heavy Industries

Inventors

• Hayashi Yoshiki

Classifications

• F16H57/0416 Primary

  Air cooling or ventilation · CPC title

• Y10T74/2189

  Cooling · CPC title

• F16H57/0495

  with fixed gear ratio · CPC title