Planetary gear reduction mechanism having an oilless bearing

Details Planetary gear reduction mechanism having an oilless bearing Planetary gear reduction mechanism having an oilless bearing

2001-09-27

2003-09-09

Marmor, Charles A. (Department: 3681)

Planetary gear transmission systems or components

With lubricaton

C384S322000

Reexamination Certificate

active

06616562

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application 2000-320720 filed Oct. 20, 2000, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a planetary gear speed reduction mechanism and, particularly, a bearing of a planetary gear mechanism.
2. Description of the Related Art
A planetary gear speed reduction mechanism used in an engine starter includes a planetary gear supported by a carrier pin via a bearing. The planetary gear is meshed with a sun gear and an internal gear so that the planetary gear can revolve around the sun gear. Accordingly, the bearing has to rotate at a high speed relative to the carrier pin under centrifugal force caused by revolution of the planetary gear. Therefore, it is necessary for the bearing to withstand heavy load and to have good lubricity.
For example, if an oilless bearing is used as the above bearing, a considerable portion of the oil contained in the oilless bearing may fly out under centrifugal force, and the bearing may not be lubricated. In order to hold such oil in the oilless bearing, JP-U-63-164621 proposes an oil-holding felt holder. However, this structure is rather complicated and necessitates additional work time to form an oil holding portion at a bearing case of the planetary gear.
SUMMARY OF THE INVENTION
A main object of the invention is to provide a simple and inexpensive bearing structure of the planetary gear speed reduction mechanism.
According to a main feature of the invention, such a bearing is a cylindrical sliding bearing that has a cylindrical inner wall forming an annular grease reservoir around a carrier pin at an end thereof. Preferably, the sliding bearing has grease reservoirs at opposite ends thereof.
The cylindrical inner wall prevents grease from flying away under centrifugal force. Further, the cylindrical inner wall may extend radially inward to hold grease more surely.


REFERENCES:
patent: 4093323 (1978-06-01), Quandt et al.
patent: 4776237 (1988-10-01), Premiski et al.
patent: 5743139 (1998-04-01), Murata
patent: 6102675 (2000-08-01), Hsieh
patent: U-63-164621 (1988-10-01), None
patent: A-5-263737 (1993-10-01), None
patent: A-9-261906 (1997-10-01), None

Affiliated with

Also associated with

Rating

Planetary gear reduction mechanism having an oilless bearing does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Planetary gear reduction mechanism having an oilless bearing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planetary gear reduction mechanism having an oilless bearing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3018913