Planetary gear reducer

Patent metadata

Field	Value
Publication number	US-9605749-B2
Application number	US-201514797305-A
Country	US
Kind code	B2
Filing date	Jul 13, 2015
Priority date	Apr 28, 2015
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A planetary gear reducer has a planetary carrier supported by an input-side main bearing and an output-side main bearing. An angular contact ball bearing or a deep groove ball bearing which requires less installation space and is inexpensive is used for the input-side main bearing. A tapered roller bearing having a large capacity is used for the output-side main bearing. A compact, flat and inexpensive planetary gear reducer can be realized in comparison with a case in which the both main bearings are tapered roller bearings.

First claim

The invention claimed is:

1. A planetary gear reducer comprising:
a tubular housing
a planetary gear;
a planetary carrier for supporting the planetary gear in the tubular housing; and
a pair of main bearings for supporting the planetary carrier on an inner peripheral surface of the housing;
wherein the pair of the main bearings are either one of the following combinations of:
a deep groove ball bearing and an angular contact ball bearing;
a deep groove ball bearing and a tapered roller bearing; and
an angular contact ball bearing and a tapered roller bearing.

2. The planetary gear reducer according to claim 1 , wherein:
the pair of the main bearings are the deep groove ball bearing and the tapered roller bearing;
the tapered roller bearing is positioned on a reducer output side in a direction of a reducer axis line with respect to the planetary gear; and
the deep groove ball bearing is positioned on a reducer input side in the direction of the reducer axis line with respect to the planetary gear.

3. The planetary gear reducer according to claim 1 , wherein:
the pair of the main bearings are the angular contact ball bearing and the tapered roller bearing;
the tapered roller bearing is positioned on a reducer output side in a direction of a reducer axis line with respect to the planetary gear; and
the angular contact ball bearing is positioned on a reducer input side in the direction of the reducer axis line with respect to the planetary gear.

4. The planetary gear reducer according to claim 1 , wherein the pair of the main bearings engage with the inner peripheral surface of the housing to support the planetary carrier.

Assignees

• Harmonic Drive Systems

Inventors

• Shirokoshi Norio

Classifications

• F16H57/082 Primary

  Planet carriers · CPC title

• F16H1/28

  with gears having orbital motion · CPC title

• F16C19/36

  with a single row of rollers · CPC title

• F16C19/163

  with angular contact · CPC title

• F16C19/54

  Systems consisting of a plurality of bearings with rolling friction (spindle bearings F16C35/08) · CPC title