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Patent Searching and Data


Title:
PUMP DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/194933
Kind Code:
A1
Abstract:
A pump device is provided with a main pump (101) and a sub pump (102) for supplying hydraulic oil to a hydraulic machine (23), and a switching valve (40) for switching between supplying the hydraulic oil discharged from the sub pump (102) to the hydraulic machine (23), and circulating the hydraulic oil to an intake side. The main pump (101) and the sub pump (102) each have a rotor (2) linked to a shared drive shaft (1), a discharge port (9) to which hydraulic oil discharged from a pump chamber (7) is led, and an annular discharge-side notch (9b) formed from an open edge part of the discharge port (9) toward the direction opposite of the rotational direction of the rotor (2). The switching valve (40) makes a switch in accordance with the rotational speed of the drive shaft (1), and at least one of the discharge-side notches (9b) of the sub pump (102) is formed so that the resistance exerted on the hydraulic oil passing through is greater than in the discharge-side notches (9b) of the main pump (101).

Inventors:
AKATSUKA KOICHIRO (JP)
FUJITA TOMOYUKI (JP)
NAKAGAWA TOMOYUKI (JP)
KATOU FUMIYASU (JP)
GOMI HIROKI (JP)
Application Number:
JP2016/066137
Publication Date:
December 08, 2016
Filing Date:
June 01, 2016
Export Citation:
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Assignee:
KYB CORP (?1056111, JP)
International Classes:
F04C11/00; F04C2/344; F04C14/26; F04C15/06
Foreign References:
JP2010014101A2010-01-21
JPH11303773A1999-11-02
JP2003184759A2003-07-03
Other References:
See also references of EP 3306094A4
Attorney, Agent or Firm:
GOTO, Masaki et al. (?1000013, JP)
Masaki Goto (?1000013, JP)
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