Title:
HYDRAULIC CIRCUIT FOR OPERATING CLUTCH
Document Type and Number:
Japanese Patent JPS58225230
Kind Code:
A
Abstract:
A multiple plate clutch (33, 34) for a tractor PTO shaft (30) is engaged by an annular piston (37) when hydraulic fluid under pressure is supplied through a line (42). A pressure-responsive variable throttle valve (25) is included in the line (42) and is responsive to the downstream pressure applied via passages (51) to a spool (47) to register large and small grooves (50 and 53) respectively with a flow passage (45) when the said pressure is low and high respectively. This allows an initial rapid flow rate for taking up slack in the clutch but, by virtue of the narrow groove (53), limits the rate at which pressure builds up once the plates have started to engage. The clutch is thereby prevented from snatching. Another hydraulic line (43) feeds the annular piston (39) for a brake (38, 40, 41) on the PTO shaft 30. A two-way changeover valve selectively connects either of the hydraulic lines (42) and (43) to the pressure source and vents the other line to a sump.
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Inventors:
HANSUUYOERUGU HIRU
SABAA HARABIYA
SABAA HARABIYA
Application Number:
JP6681483A
Publication Date:
December 27, 1983
Filing Date:
April 15, 1983
Export Citation:
Assignee:
DEERE & CO
International Classes:
F16D48/02; F16D48/04; (IPC1-7): F16D25/14
Domestic Patent References:
| JP50071832B |
Attorney, Agent or Firm:
Kyozo Yuasa
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