Title:
VARIABLE DISPLACEMENT PUMP
Document Type and Number:
WIPO Patent Application WO/2021/054137
Kind Code:
A1
Abstract:
According to the present invention, a discharge port (26), which is a concave arc-shaped discharge part, is notched in a bottom surface (13a) of a pump accommodation part (13) of a variable displacement pump. Furthermore, a first low-pressure chamber (281) is formed, on an attachment surface (1b) of a housing body (1), at a position radially overlapping a pump structure including a drive shaft (3), a rotor (4), and each vane (5). A drain hole (28b) connected to a low-pressure part outside the housing body (1) is formed in a bottom surface (28a) of the first low-pressure chamber (281) to pass through the pump structure (14) along a direction of a rotation axis (O1). The low-pressure part has a pressure that is equal to or lower than the oil pressure of oil discharged from the discharge port (26). The oil from the discharge port (26) having a pressure higher than that of the first low pressure chamber (281) flows into the first low-pressure chamber (281) due to a pressure difference between the discharge port (26) and the first low-pressure chamber (281).
Inventors:
NAGANUMA ATSUSHI (JP)
Application Number:
PCT/JP2020/033450
Publication Date:
March 25, 2021
Filing Date:
September 03, 2020
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
F04C14/22
Foreign References:
| JP2012122389A | 2012-06-28 | |||
| JP2016098767A | 2016-05-30 | |||
| JP2013057326A | 2013-03-28 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
Download PDF: