公开(公告)号：US11415218B2

公开(公告)日：2022-08-16

申请号：US17285004

申请日：2019-10-21

Applicant: KYB Corporation

Inventor： Kazuya Murota

IPC: F16H61/02 ,  F16H61/12

Abstract: A working fluid supply device is provided with: a first oil pump and a second oil pump driven by an engine; a third oil pump driven by an electric motor; a first unloading valve configured to shift the second oil pump to a no-load operation state; and a controller configured to control a supply state of working oil to an automatic transmission. The controller sets the supply state to a supply state selected from: a first supply state in which the working oil is supplied only from the first oil pump; a second supply state in which the working oil is supplied from the first oil pump and the third oil pump; a third supply state in which the working oil is supplied from the first oil pump and the second oil pump; and a fourth supply state in which the working oil is supplied from the first oil pump, the second oil pump, and the third oil pump.

公开(公告)号：US11820305B2

公开(公告)日：2023-11-21

申请号：US17756861

申请日：2020-10-13

Applicant: KYB Corporation

Inventor： Tsuyoshi Hironaka ,  Midori Nagashima ,  Ken Tsukui ,  Kazuya Murota

IPC: F15B11/17 ,  B60R16/08 ,  F16H61/66

CPC classification number: B60R16/08 ,  F15B11/17 ,  F16H61/66

Abstract: A working fluid supply system is provided with: a first oil pump and a second oil pump driven by an engine; a switching valve configured to cause a discharge passage of the second oil pump to communicate with at least one of a supply passage and a first drain passage; and a controller configured to switch the switching valve. The controller is configured to switch the switching valve by spending a switching time that is set in accordance with a degree of pressure variation predicted to be caused in the supply passage when the switching valve is switched instantaneously.

公开(公告)号：US12038001B2

公开(公告)日：2024-07-16

申请号：US17755763

申请日：2020-10-13

Applicant: KYB Corporation

Inventor： Tsuyoshi Hironaka ,  Midori Nagashima ,  Ken Tsukui ,  Kazuya Murota

IPC: F04C14/02 ,  F16H57/04 ,  F15B13/00 ,  F15B21/00 ,  F16H61/00

CPC classification number: F04C14/02 ,  F16H57/0439 ,  F15B13/00 ,  F15B21/001 ,  F16H57/0435 ,  F16H57/0441 ,  F16H61/0031

Abstract: A working-fluid supply system includes: a first pump and a second pump driven by an engine; a first switching valve capable of switching a supply target of the second pump to either one of the discharge side and the suction side of the first pump; a first switching control unit configured to perform a switching control of the first switching valve; and a first pressure control unit configured to perform a control such that pressure on the suction side of the first pump becomes a predetermined first pressure when the first switching valve is switched such that the supply target of the second pump becomes the suction side of the first pump.