ENGINE-ASSIST DEVICE AND INDUSTRIAL MACHINE

Title:

ENGINE-ASSIST DEVICE AND INDUSTRIAL MACHINE

Document Type and Number:

WIPO Patent Application WO/2014/115645

Kind Code:

A1

Abstract:

Provided are a low-cost engine-assist device that can perform stable energy regeneration from an accumulator, and an industrial machine equipped with the engine-assist device. Directly coupled to an engine (6) are variable-capacity main pumps (7, 8), and a variable-capacity assist pump (16) having a motor function and a pump function. Return pressure fluid that has flowed out of fluid pressure actuators (3a, 9) is temporarily stored by a sub-accumulator (18) and supplied to an inlet of the assist pump (16), and the assist pump (16) provides increased pressure to main accumulators (17). A controller calculates and controls an assist pump swash plate angle by means of engine load torque, or of assist starting torque or charge starting torque set by an engine speed setting means, and the controller conducts the stored-pressure fluid discharged from the main accumulators (17) to the inlet of the assist pump (16) or conducts the increased-pressure fluid discharged from the outlet of the assist pump (16) to the main accumulators (17).

Inventors:

KAJITA SHIGEO (JP)
KISHIDA KOUJI (JP)
TADA SHOGO (JP)
YOSHINO TETSUYA (JP)
KANENAWA YUYA (JP)
MATOBA NOBUAKI (JP)

Application Number:

PCT/JP2014/050761

Publication Date:

July 31, 2014

Filing Date:

January 17, 2014

Export Citation:

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Assignee:

CATERPILLAR SARL (CH)
KAJITA SHIGEO (JP)
KISHIDA KOUJI (JP)
TADA SHOGO (JP)
YOSHINO TETSUYA (JP)
KANENAWA YUYA (JP)
MATOBA NOBUAKI (JP)

International Classes:

F15B21/14; E02F9/22

Foreign References:

JP2001253649A	2001-09-18
JPS63212699A	1988-09-05
JPS51392U	1976-01-06
JP2012102881A	2012-05-31
JP2011220390A	2011-11-04
JPH0771409A	1995-03-17
JP2011179457A	2011-09-15
JP2006322578A	2006-11-30
JP2006349092A	2006-12-28

Other References: