The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2015
Filed:
Jun. 17, 2011
Takeshi Kobayashi, Kasumigaura, JP;
Ryouhei Yamashita, Tsuchiura, JP;
Hiroshi Matsuzaki, Tsukuba, JP;
Yoshinobu Kobayashi, Kasumigaura, JP;
Katsumi Ueno, Higashimatsuyama, JP;
Masaaki Andou, Tsuchiura, JP;
Takeshi Kobayashi, Kasumigaura, JP;
Ryouhei Yamashita, Tsuchiura, JP;
Hiroshi Matsuzaki, Tsukuba, JP;
Yoshinobu Kobayashi, Kasumigaura, JP;
Katsumi Ueno, Higashimatsuyama, JP;
Masaaki Andou, Tsuchiura, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
A boom control valve and a pulsation absorption control valve are provided in the halfway point of a center bypass line. The pulsation absorption control valve is arranged in a position downstream of the boom control valve. The pulsation absorption control valve is switched to a blockade position and a communication position by a pilot pressure from a remote control valve. The pulsation absorption control valve is constituted such that one main line out of a pair of main lines is communicated with or blocked off from an accumulator via one communication line and the other main line is communicated with or blocked off from the side of a tank via the other communication line. The accumulator is operated as a dynamic damper at the traveling of a vehicle. This arrangement enables the construction of the communication line to be simplified, thus improving operability at assembling.