초록 ▼

A remote controlled hydraulic circuit of the type comprising a source of pressurized fluid, a number of hydraulic motors connectible to the source of pressurized fluid, and control means for connecting the source of pressurized fluid to the hydraulic motors, the control means being remotely piloted

A remote controlled hydraulic circuit of the type comprising a source of pressurized fluid, a number of hydraulic motors connectible to the source of pressurized fluid, and control means for connecting the source of pressurized fluid to the hydraulic motors, the control means being remotely piloted by a series of pressure signals each of which corresponds to the opening of the connection between the source of pressurized fluid and a respective hydraulic motor. The hydraulic circuit according to the invention includes selector means for establishing priority for supplying pressurized fluid to one or more preferential hydraulic motors. These selector means are intended to detect, when operatively active, pressure signals corresponding to the supply of pressurized fluid to the preferential hydraulic motors and, in this condition, to render inoperative the control means associated with the other hydraulic motors, should they already have been activated to effect the supply of these other hydraulic motors. The hydraulic circuit according to the invention is used, for example, in the control of a lifting arm or boom for the bucket of an earth-moving machine so as to ensure return movement of the bucket when the latter is operated simultaneously with or at the same time as the movement of the lifting arm.

대표청구항 ▼

A hydraulic circuit including: a source of pressurized fluid; a plurality of hydraulic motors connectible to the source of pressurized fluid, and control means for connecting the source of pressurized fluid to the hydraulic motors, the control means being remotely piloted by a series of pressure sig

A hydraulic circuit including: a source of pressurized fluid; a plurality of hydraulic motors connectible to the source of pressurized fluid, and control means for connecting the source of pressurized fluid to the hydraulic motors, the control means being remotely piloted by a series of pressure signals each of which corresponds to the opening of the connection between the source of pressurized fluid and a respective hydraulic motor, selector means for the priority supply of pressurized fluid to one or more preferential hydraulic motor chambers, the selector means being intended to detect, when they are active, the pressure signals corresponding to the supply of pressurized fluid to the preferential hydraulic motors and, in this condition, to render inoperative the control means associated with the other hydraulic motors, should they already have been activated to effect the supply of the other hydraulic motors, said selector means including a main selector valve comprising: a first inlet which, when at least one of the pressure signals corresponding to the supply of pressurized fluid to the preferential hydraulic motors is active, receives this pressure signal; a second inlet which, when at least one of the pressure signals corresponding to the supply of pressurized fluid into the non-preferential hydraulic motors is active, receives this pressure signal; an outlet which is supplied with pressurized fluid when the first inlet and the second inlet receive a pressure signal, actuator means which is activated by the pressurized fluid from said outlet, a first outlet communicating with a drain tank and a second outlet connected to the control means associated with non-preferential hydraulic motors, and in that the actuator means comprises piston means that puts the first outlet into communication with the second outlet when the outlet of the main selector valve is supplied with pressurized fluid.