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Patent Searching and Data


Title:
FLUID-PRESSURE APPARATUS
Document Type and Number:
WIPO Patent Application WO/2013/084542
Kind Code:
A1
Abstract:
The present invention comprises a pair of gears (20) having mutually meshing teeth, a housing having a fluid-pressure chamber in which the pair of gears (20) are accommodated in meshed condition, and a bushing accommodated in the fluid-pressure chamber of the housing when the edge surfaces of the gears are in contact with each other, a chamfering (M) being applied to at least an intermediate area between the tooth tip and the tooth bottom on the edges of the edge surfaces of the gears, the size of the rounded or inclined surfaces of the intermediate area being larger than the rounded or inclined surfaces of the tooth tip or the tooth bottom. This makes it possible to prevent damage to the edge portion due to contact force during meshing of the pair of gears, and to prevent leakage of operation fluid passing between a gear and a support member. Therefore, the original quiet and high output efficiency can be maintained for a long period of time, and high reliability can be achieved.

Inventors:
TAKEDA HIROAKI (JP)
Application Number:
PCT/JP2012/070337
Publication Date:
June 13, 2013
Filing Date:
August 09, 2012
Export Citation:
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Assignee:
SUMITOMO PRECISION PROD CO (JP)
TAKEDA HIROAKI (JP)
International Classes:
F04C2/18; F03C2/08
Foreign References:
JPS51109401U1976-09-03
JP2003083259A2003-03-19
JPS5170504A1976-06-18
JP2010521610A2010-06-24
Other References:
See also references of EP 2789854A4
Attorney, Agent or Firm:
MURAKAMI, SATOSHI (JP)
Tomoji Murakami (JP)
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Claims: