국제 및 국내 특허문헌 검색

1. (WO2011155156) FILL PLUG FOR HYDRAULIC DEVICE

Pub. No.:    WO/2011/155156    International Application No.:    PCT/JP2011/003090
Publication Date: Fri Dec 16 00:59:59 CET 2011 International Filing Date: Thu Jun 02 01:59:59 CEST 2011
IPC: F16J 13/12
F16B 35/00
Applicants: KAWASAKI JUKOGYO KABUSHIKI KAISHA
川崎重工業株式会社
SAKAI, Ryuji
堺 隆二
WADA, Hisao
和田 寿夫
IMAI, Tatsuya
今井 達也
Inventors: SAKAI, Ryuji
堺 隆二
WADA, Hisao
和田 寿夫
IMAI, Tatsuya
今井 達也
Title: FILL PLUG FOR HYDRAULIC DEVICE
Abstract:
A fill plug for a hydraulic device is tightened to a high tightening torque value against a female threaded section which is formed in an oil passage of a hydraulic device. Thus a through hole in the oil passage under high internal pressure can be sealed up with high efficiency. Furthermore, the height of the head section is restricted to a small size, with the result that the hydraulic device is downsized and the cost thereof is reduced. Said fill plug is configured in such a way that a head section (16) is formed at the upper end of a male threaded section (15); that by tightening the male threaded section (15) against a female threaded section (14) formed in an oil passage (13) of a hydraulic device (12), it is possible to bring a sealing section (18) formed in the head section (16) into pressure contact with a funnel-shaped inclined inner circumferential surface (19) which is formed at one end of the female threaded section (14); that a circumferential area above the sealing section (18) is formed as a tapered section (22); that an annular concave section (21) is formed between the sealing section (18) and the upper end of the male threaded section (15); and that a dimensionless value of a head section height H1 from the upper end surface of the head section (16) to the sealing section (18) is 0.4 - 0.7, said dimensionless value being obtained by dividing the head section height H1 by the nominal value of the threaded section (15).