To prevent the stop of an engine caused by an engine stall.
This hydraulic drive type working vehicle includes main circuits (20, 30) to which swash plate type hydraulic pumps (21, 31) driven by an engine (15), and hydraulic motors (24, 34) driven by operating oil pressure from the hydraulic pumps (21, 31), are connected; and a charge pump circuit (50) having a charge pump (51) driven by the engine (15), and servo cylinders (61, 62) with centering springs (6d) having pistons (6a) moved by introducing the operating oil pressure from the charge pump (51) as pilot pressure, to tilt swash plates (S) of the hydraulic pumps (21, 31). A bleed-off passage (66) having a bleed-off orifice (67) for leaking a part of operating oil from a main passage (52) is connected to the main passage (52) of the discharge side of the charge pump (51).
EGAWA FUMIAKI
SUGIMURA TAKEO
WATANABE TORU
| JPS63259180A | 1988-10-26 | |||
| JP2002188719A | 2002-07-05 | |||
| JPH02245572A | 1990-10-01 |
Hiroshi Takeuchi
Takahisa Shimada
Yuji Takeuchi
Katsumi Imae