公开(公告)号：US20220234710A1

公开(公告)日：2022-07-28

申请号：US17203275

申请日：2021-03-16

Applicant: HITACHI ASTEMO, LTD.

Inventor： Xing SUN ,  Hayato TSUTSUI

IPC: B63H20/12 ,  B63H25/22 ,  B63H25/30

Abstract: A steering device includes: a flow passage forming member including a first flow passage connecting to a first chamber and a second flow passage connecting to a second chamber; a movable member movable relative to the flow passage forming member; a seal member configured to seal a space between the movable member and the flow passage forming member when the seal member is in contact with the movable member and the flow passage forming member; an operation part capable of rotating an outboard motor; and a resistance reducing part configured to reduce a flow resistance so that a fluid flows between the first and second flow passages even with a pressure generated in the first chamber or the second chamber due to an operation of the operation part by a load equal to or lower than a predetermined load, when sealing is not made by the seal member.

公开(公告)号：US20220234709A1

公开(公告)日：2022-07-28

申请号：US17203089

申请日：2021-03-16

Applicant: HITACHI ASTEMO, LTD.

Inventor： Xing SUN ,  Hayato TSUTSUI

IPC: B63H20/12 ,  F15B13/02 ,  F15B11/024 ,  F15B15/14

Abstract: A steering device includes: a cylinder demarcated into first and second chambers by a piston; a main valve having first and second shuttle chambers; a hydraulic source having first and second discharge ports; a first oil passage configured to connect the first chamber and the first shuttle chamber; a second oil passage configured to connect the second chamber and the second shuttle chamber; a third oil passage configured to connect the first shuttle chamber and the first discharge port; a fourth oil passage configured to connect the second shuttle chamber and the second discharge port; and a tank connected to the main valve via the third oil passage and the fourth oil passage. One of the first shuttle chamber and the second shuttle chamber of the main valve is in an opened state when the hydraulic source is stopped.