Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
PUMP DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/054139
Kind Code:
A1
Abstract:
According to the present invention, a groove (38) is formed, which extends, from a starting end of a discharge port (36), in the reverse direction of the rotation direction of a vane (22). A first end section (38A) of the groove is connected to the starting end of the discharge port (36). When a vane (22) on the front side with respect to the rotation direction of a driving shaft (11) is at the starting end of the discharge port (36), a second end section (38B) of the groove (38) is positioned behind a vane (22) on the rear side in the rotation direction of the driving shaft (11), and communicates with a suction port. A portion of a working liquid in the preceding pump chamber (27) can escape to the subsequent pump chamber (27) that communicates with a suction port (35), and an excessive increase in the pressure in the preceding pump chamber (27) is suppressed to suppress a pulsation phenomenon.

Inventors:
SUNAGA, Yukichi (7-1, Onna 4-chome, Atsugi-sh, Kanagawa 10, 〒2438510, JP)
Application Number:
JP2018/030900
Publication Date:
March 21, 2019
Filing Date:
August 22, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HITACHI AUTOMOTIVE SYSTEMS, LTD. (2520, Takaba Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
International Classes:
F04C2/344; F04C14/22; F04C15/06
Foreign References:
JP2013032739A2013-02-14
JPH02169883A1990-06-29
JP2015059524A2015-03-30
JP2016017450A2016-02-01
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (Ekisaikai Bldg. 1-29, Akashi-cho, Chuo-k, Tokyo 44, 〒1040044, JP)
Download PDF: