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Title:
HYDRAULIC CIRCUIT HAVING ROTARY TYPE PUMP AND BRAKE DEVICE USING THE HYDRAULIC CIRCUIT
Document Type and Number:
Japanese Patent JP3697880
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To prevent leakage of brake fluid from a rotary type pump when a pressure at the suction port of the rotary type pump is increased to a high value.
SOLUTION: A casing 50 incorporates outer and inner rotors 51 and 52 and has a central hole 50a in which a drive shaft 54 is fitted. The casing 50 is provided with ports 60 and 61 to suck and discharge brake fluid from and to the rotors 51 and 52 and a line J to guide leak oil in a central hole 50a to the outside of the casing 50 is provided. Oil leaking from the line J is returned to a spot situated upper stream from the rotary type pump. In this case, when a pressure in a spot situated upper stream from the rotary type pump is high, brake fluid is not returned, whereby a reservoir is provided to store brake fluid flowing through the line J. When a pressure in a spot situated upper stream from the rotary type pump is reduced to a low value, brake fluid is returned from the reservoir.


Inventors:
Yamaguchi, Takahiro
Morikawa, Toshiya
Application Number:
JP1998000003364
Publication Date:
September 21, 2005
Filing Date:
January 09, 1998
Export Citation:
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Assignee:
DENSO CORP
International Classes:
B60T7/12; B60T8/1766; B60T8/32; B60T8/40; B60T8/42; B60T8/44; B60T8/48; B60T13/16; B60T13/68; B60T17/02; F04C2/10; F04C14/00; F04C15/00; F04C15/06; F15B1/02; F15B7/10; (IPC1-7): F04C15/00; B60T8/48; F04C2/10
Domestic Patent References:
JP9014153A
JP8175351A
JP8268256A
JP49064903A
JP56156487A
JP1208585A
Attorney, Agent or Firm:
伊藤 洋二
三浦 高広