Title:
COOLING FAN DRIVE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2011/111338
Kind Code:
A1
Abstract:
A cooling fan drive circuit for supplying cooling air to coolers, such as a radiator and an oil cooler, is provided with: a hydraulic motor (13) which has a cooling fan (12) affixed to the output shaft thereof; a variable displacement hydraulic pump (5) which is provided with a discharge amount control unit (5a) for controlling the amount of discharge of hydraulic oil and which sucks the hydraulic oil from a hydraulic oil tank (15) and discharges the hydraulic oil; a pump discharge path (31) which leads from the hydraulic pump (5) to the hydraulic motor (13); a return path (34) which leads from the hydraulic motor (13) to the hydraulic oil tank (15); a branch path (41) which is formed so as to be branched from the pump discharge path (31) and which leads to the hydraulic oil tank (15); a flow restriction (51) and a pressure control valve (52) which are provided to the branch path (41); and a discharge amount control pressure supply path (42) which is connected between the flow restriction (51) and the pressure control valve (52) of the branch path (41) and which supplies a discharge amount control pressure to the discharge amount control unit (5a).
Inventors:
KODERA, Hiroyasu (())
小寺 裕康 (())
小寺 裕康 (())
Application Number:
JP2011/001206
Publication Date:
September 15, 2011
Filing Date:
March 02, 2011
Export Citation:
Assignee:
KABUSHIKI KAISHA KCM (2680, Oka Inami-cho, Kako-gu, Hyogo 13, 〒6751113, JP)
株式会社ＫＣＭ (〒13 兵庫県加古郡稲美町岡２６８０番地 Hyogo, 〒6751113, JP)
HITACHI CONSTRUCTION MACHINERY CO., LTD. (2-5-1 Koraku, Bunkyo-ku Tokyo, 63, 〒1128563, JP)
日立建機株式会社 (〒63 東京都文京区後楽二丁目５番１号 Tokyo, 〒1128563, JP)
株式会社ＫＣＭ (〒13 兵庫県加古郡稲美町岡２６８０番地 Hyogo, 〒6751113, JP)
HITACHI CONSTRUCTION MACHINERY CO., LTD. (2-5-1 Koraku, Bunkyo-ku Tokyo, 63, 〒1128563, JP)
日立建機株式会社 (〒63 東京都文京区後楽二丁目５番１号 Tokyo, 〒1128563, JP)
International Classes:
F01P7/04; E02F9/00; F01P5/04
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (3rd Fl, Bo-eki Bldg. 123-1 Higashimachi, Chuo-ku, Kobe-sh, Hyogo 31, 〒6500031, JP)
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Claims:
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