公开(公告)号：US20190003497A1

公开(公告)日：2019-01-03

申请号：US16069207

申请日：2016-01-29

Applicant: Komatsu Ltd.

Inventor： Shuuji Hori ,  Masato Kageyama ,  Mutsumi Ono ,  Hiroyuki Chikugo ,  Akira Hasebe ,  Junichi Fukushima ,  Shunsuke Koike

IPC: F15B13/04 ,  F15B11/10 ,  F15B13/043 ,  F15B13/042 ,  F16K31/06

Abstract: A hydraulic cylinder spool valve device, which extends and retracts a cylinder rod of a hydraulic cylinder, includes: a first spool valve having a first dead band and a first opening characteristic; a second spool valve having a second dead band and a second opening characteristic; and a controller performing communication with the hydraulic cylinder by using the first spool valve and positioning the second spool of the second spool valve within the second dead band and performing communication with the hydraulic cylinder by using the second spool valve and positioning the first spool of the first spool valve within the first dead band, and adjusting a characteristic of a switching dead band between the first opening characteristic and the second opening characteristic.

公开(公告)号：US10753376B2

公开(公告)日：2020-08-25

申请号：US16069207

申请日：2016-01-29

Applicant: Komatsu Ltd.

Inventor： Shuuji Hori ,  Masato Kageyama ,  Mutsumi Ono ,  Hiroyuki Chikugo ,  Akira Hasebe ,  Junichi Fukushima ,  Shunsuke Koike

IPC: F15B11/04 ,  F15B13/04 ,  F15B11/042 ,  F15B13/12 ,  F15B11/10 ,  F15B13/042 ,  F15B13/043 ,  F16K31/06 ,  E02F9/22

Abstract: A hydraulic cylinder spool valve device, which extends and retracts a cylinder rod of a hydraulic cylinder, includes: a first spool valve having a first dead band and a first opening characteristic; a second spool valve having a second dead band and a second opening characteristic; and a controller performing communication with the hydraulic cylinder by using the first spool valve and positioning the second spool of the second spool valve within the second dead band and performing communication with the hydraulic cylinder by using the second spool valve and positioning the first spool of the first spool valve within the first dead band, and adjusting a characteristic of a switching dead band between the first opening characteristic and the second opening characteristic.