Title:
WORK VEHICLE
Document Type and Number:
WIPO Patent Application WO/2020/067029
Kind Code:
A1
Abstract:
The objective of the present invention is to provide a work vehicle capable of improving running performance only when a high running performance is required, while reducing fuel consumption.
A wheel loader 1 is provided with an engine 3, a variable displacement type hydraulic static transmission (HST) pump 41, a variable displacement type HST motor 42 connected to the HST pump 41 in a closed circuit, a pressure detector 72A, 72B for detecting a load pressure on the HST motor 42, and a controller 5, wherein, if a load pressure detected value P is determined to lie in a predetermined pressure range that is larger than a load pressure Pα corresponding to travel on level ground, and is smaller than a load pressure Pγ corresponding to an excavation operation, the controller 5 increases the maximum speed of rotation of the engine 3 provided that the load pressure detected value P remains within the predetermined pressure range.
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Inventors:
HYODO KOJI (JP)
TANAKA TETSUJI (JP)
AOKI ISAMU (JP)
NUKII MASAKI (JP)
AHIKO YUKI (JP)
TANAKA TETSUJI (JP)
AOKI ISAMU (JP)
NUKII MASAKI (JP)
AHIKO YUKI (JP)
Application Number:
PCT/JP2019/037307
Publication Date:
April 02, 2020
Filing Date:
September 24, 2019
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F02D29/04; E02F9/20; F02D29/00
Domestic Patent References:
| WO2010116853A1 | 2010-10-14 | |||
| WO2010116853A1 | 2010-10-14 |
Foreign References:
| JP2001295682A | 2001-10-26 | |||
| JP2015071976A | 2015-04-16 | |||
| JP2017115832A | 2017-06-29 | |||
| JP2008223307A | 2008-09-25 |
Other References:
See also references of EP 3822471A4
Attorney, Agent or Firm:
THE PATENT BODY CORPORATE TAKEWA INTERNATIONAL PATENT OFFICE (JP)
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