Title:
HYDRAULIC DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/049327
Kind Code:
A1
Abstract:
According to the present invention, a first torque control proportional electromagnetic valve (37) is connected to a third pressure-receiving chamber (32D) of a first torque control regulator (32) via a first torque control pipeline (41). A second torque control proportional electromagnetic valve (38) is connected to a third pressure-receiving chamber (35D) of a second torque control regulator (35) via a second torque control pipeline (42). The first and second torque control proportional electromagnetic valves (37, 38) are controlled by a controller (47). A switching valve (48) is provided between the first torque control pipeline (41) and the second torque control pipeline (42). When driving left and right traveling hydraulic motors (2B, 2C), the switching valve (48) supplies the output pressure of the first torque control proportional electromagnetic valve (37) to the third pressure-receiving chamber (35D) of the second torque control regulator (35).
Inventors:
TAKAHASHI KIWAMU (JP)
ISHIKAWA KOUJI (JP)
TSURUGA YASUTAKA (JP)
HOSHINO MASATOSHI (JP)
HIJIKATA SEIJI (JP)
ISHIKAWA KOUJI (JP)
TSURUGA YASUTAKA (JP)
HOSHINO MASATOSHI (JP)
HIJIKATA SEIJI (JP)
Application Number:
PCT/JP2017/032536
Publication Date:
March 14, 2019
Filing Date:
September 08, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
B62D11/04; F15B11/22; E02F9/22; F15B11/02
Foreign References:
| JP2010078047A | 2010-04-08 | |||
| JP2009299288A | 2009-12-24 | |||
| JPH11132202A | 1999-05-18 | |||
| JPH10159807A | 1998-06-16 | |||
| JP2011157790A | 2011-08-18 |
Other References:
See also references of EP 3495668A4
Attorney, Agent or Firm:
HIROWA PATENT FIRM (JP)
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