Title:
GEAR PUMP
Document Type and Number:
WIPO Patent Application WO/2006/090652
Kind Code:
A1
Abstract:
A gear pump (100) suitable for feeding a high pressure and high viscosity fluid such as a molten resin, installed in a casing (1), and capable of feeding the fluid from a suction port (11) side to a discharge port (12) side by the rotation of gears (2) and (3) formed in a pair and meshing with each other. The gears (2) and (3) are formed in double helical gears with one-point continuous contact tooth profile and the ratios of the outer diameters D to the tooth widths B of the gears (2) and (3) are set to 1.1 to 1.15. When the ratio D/B is equal to or lower than 1.1, a bearing load is excessively increased and a bearing may be damaged. Therefore, the gear pump becomes unsuitable for feeding the molten resin. On the other hand, when the ratio D/B surpasses 1.15, a mechanical efficiency is lowered and, accordingly, the total efficiency is lowered according to an increase in the overall size of the pump.
Inventors:
OKADA MOTOHIRO (JP)
Application Number:
PCT/JP2006/302890
Publication Date:
August 31, 2006
Filing Date:
February 17, 2006
Export Citation:
Assignee:
SHIMADZU CORP (JP)
OKADA MOTOHIRO (JP)
OKADA MOTOHIRO (JP)
International Classes:
F04C2/18
Foreign References:
| JPS501004Y1 | 1975-01-11 | |||
| JPS5138922B1 | 1976-10-25 | |||
| JPS3513504B1 | ||||
| JPS3516254B1 | ||||
| JPS56127391U | 1981-09-28 | |||
| JPS307809B1 | ||||
| JPS5064804A | 1975-06-02 | |||
| JP2005048965A | 2005-02-24 |
Other References:
"Elicloid gear pump ni Tsuite", NIPPON KUROIDO KOGYO KABUSHIKI KAISHA, 2002, XP003002252, Retrieved from the Internet
Attorney, Agent or Firm:
Nishiwaki, Tamio (6-7 Ginza 6-chom, Chuo-ku Tokyo 61, JP)
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