F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/69.13
F15B 21/00 (2006.01) E02F 9/22 (2006.01) F15B 11/17 (2006.01)
Patent
CA 1143252
"HYDRAULIC CIRCUITRY FOR A BACKHOE" ABSTRACT OF THE DISCLOSURE The invention relates to a hydraulic circuitry for a backhoe in which a hydraulic motor for driving one of right and left crawlers and a hydraulic cylinder for vertically oscillating a working arm assembly are connected in parallel to each other to a first pump through a multiplex valve assembly having a first center bypass, and a hydraulic motor for driving the other crawler, a hydraulic motor for slewing a platform, a hydraulic cylinder for flexing and stretching the arm assembly, a cylinder for actuating a bucket and a cylinder for actuating a dozer are connected in parallel to one another to a second pump through a further multiplex valve assembly having a second center bypass. The invention provides a circuit to permit fluid under pressure from the first pump to enter the circuit connected to the second pump to provide confluence therein, when the dozer actuating cylinder connected to the second pump, for example, is operated while the backhoe is running. When the motor and/or the cylinder connected to the first pump is (or are) at rest, the cylinders and motors connected to the second pump except the platform slewing motor are arranged to be accelerated.
361335
Kubota Ltd.
Marks & Clerk
LandOfFree
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