Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2020/202659
Kind Code:
A1
Abstract:
The present invention prevents a work machine (1) from advancing or retreating when an accelerator is not being operated. The work machine (1) is provided with: a traveling device; a traveling motor (51) that transmits power to the traveling device; a swash plate-type hydraulic pump (50) that supplies a working oil to the traveling motor (51); a motor that drives the hydraulic pump (50); a first servo cylinder (61) that sets the swash angle of the hydraulic pump (50); a charge pump (P1) that supplies a pilot oil to the first servo cylinder (61); a switching valve that can switch between a travel position where the pilot oil is supplied from the charge pump (P1) to the first servo cylinder (61) and a neutral position where the supply of the pilot oil to the first servo cylinder (61) is cutoff; a switching operation member that receives the switching operations in a travel mode and a neutral mode; and a control device (90) that switches the switching valve to either of the travel position or the neutral position, wherein the control device (90) maintains the switching valve at the neutral position until the rotation speed of the motor reaches a first predetermined rotation speed or higher after the switching operation member is operated to the travel mode.
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Inventors:
NISHIMOTO RYUKI (JP)
IWAMOTO TERUHIKO (JP)
AIZAWA TSUTOMU (JP)
NOGUCHI MAKOTO (JP)
IWAMOTO TERUHIKO (JP)
AIZAWA TSUTOMU (JP)
NOGUCHI MAKOTO (JP)
Application Number:
PCT/JP2019/049665
Publication Date:
October 08, 2020
Filing Date:
December 18, 2019
Export Citation:
Assignee:
KUBOTA KK (JP)
International Classes:
E02F9/22; F15B11/00; F16H61/4069
Foreign References:
| JPH0658407A | 1994-03-01 | |||
| JPH1194075A | 1999-04-09 | |||
| JP2011231821A | 2011-11-17 | |||
| JP2014190235A | 2014-10-06 |
Other References:
See also references of EP 3951098A4
Attorney, Agent or Firm:
YASUDA & OKAMOTO PATENT ATTORNEYS (JP)
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