Speed reduction apparatus

Patent metadata

Field	Value
Publication number	US-2016290478-A1
Application number	US-201615087676-A
Country	US
Kind code	A1
Filing date	Mar 31, 2016
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

Disclosed is a speed reduction apparatus including: a casing that accommodates a speed reduction mechanism; an input shaft including a protruding portion protruding from the casing to the outside; a fan provided on the protruding portion of the input shaft; and a fan hood that covers the fan. The fan hood includes a cylindrical portion, and a trumpet-like portion that is connected to the cylindrical portion, and includes an inner surface inclined to be separated away from the input shaft toward a load side. A flow straightening fin is provided on an inner surface of the trumpet-like portion.

First claim

What is claimed is:

1 . A speed reduction apparatus comprising:
a casing that accommodates a speed reduction mechanism; an input shaft including a protruding portion protruding from the casing to the outside; a fan provided on the protruding portion of the input shaft; and a fan hood that covers the fan, wherein the fan hood includes a cylindrical portion, and a trumpet-like portion that is connected to the cylindrical portion, and includes an inner surface inclined to be separated away from the input shaft toward a load side, and a flow straightening fin is provided on an inner surface of the trumpet-like portion.

2 . The speed reduction apparatus according to claim 1 ,
wherein the speed reduction apparatus is used in a state where a lower surface of the casing is mounted on a floor or the like, wherein the trumpet-like portion includes a diameter increasing portion having an inner surface inclined to be separated away from the input shaft toward the load side, and a flat portion having an inner surface parallel to the input shaft, wherein the trumpet-like portion includes a pair of the diameter increasing portions respectively provided on an upper surface side and a lower surface side of the casing, wherein the trumpet-like portion includes a pair of the flat portions, each of which is provided to connect the diameter increasing portions on the upper surface side to the diameter increasing portion on the lower surface side, and wherein the flow straightening fin is provided on an inner surface of each of the diameter increasing portion on the upper surface side and the pair of the flat portions, and the flow straightening fin is not provided on an inner surface of the diameter increasing portion on the lower surface side.

3 . The speed reduction apparatus according to claim 1 ,
wherein the flow straightening fin is not provided on an inner surface of the cylindrical portion.

4 . The speed reduction apparatus according to claim 1 ,
wherein at least a portion of all of the flow straightening fins provided on the inner surface of the trumpet-like portion overlap each other in a circumferential direction.

5 . The speed reduction apparatus according to claim 1 ,
wherein the trumpet-like portion includes a diameter increasing portion having an inner surface inclined to be separated away from the input shaft toward the load side, and a flat portion having an inner surface parallel to the input shaft, and wherein a second flow straightening fin is provided on an inner surface of the cylindrical portion connected to the flat portion along with providing the flow straightening fin on an inner surface of the diameter increasing portion.

6 . The speed reduction apparatus according to claim 1 ,
wherein the flow straightening fins and the fan do not overlap each other when seen in a radial direction.

7 . The speed reduction apparatus according to claim 1 ,
wherein the cylindrical portion includes a first cylindrical portion connected to a non-load side of the trumpet-like portion, and a second cylindrical portion connected to a load side of the trumpet-like portion.

8 . The speed reduction apparatus according to claim 1 ,
wherein the trumpet-like portion includes a diameter increasing portion having an inner surface inclined to be separated away from the input shaft toward to the load side, and a flat portion having an inner surface parallel to the input shaft, and wherein the diameter increasing portion includes a central diameter increasing portion, and right and left diameter increasing portions which are respectively positioned on the right and left sides of the central diameter increasing portion, and the flow straightening fin is provided on an inner surface of the central diameter increasing portion.

9 . The speed reduction apparatus according to claim 1 ,
wherein the cylindrical portion includes a cutout through which a hanging tool is exposed.

Assignees

• Sumitomo Heavy Industries

Inventors

• Kimura Kazuhiro

Classifications

• F16H57/0416 Primary

  Air cooling or ventilation · CPC title

• F04D29/547

  having a special shape in order to influence fluid flow · CPC title

• F04D19/002

  Axial flow fans · CPC title

• F04D29/5806

  Cooling the drive system · CPC title