Hydraulic system for heavy equipment option apparatus

Abstract

The present invention is directed to controlling an operation oil supplied to an option apparatus without changing a design of a control valve assembly which controls an operation oil supplied to a traveling motor, etc. when additionally engaging an option apparatus to a small size excavator. In a hydraulic system for a heavy equipment which includes a plurality of hydraulic pumps, a main control valve which is switched by a pilot signal pressure and controls an operation oil supplied to a left and right side traveling motor and a work apparatus, and a pilot pump which supplies a pilot signal pressure to the main control valve, there is provided a hydraulic system for a heavy equipment option apparatus which includes a straight traveling control valve which combines an operation from a plurality of the hydraulic pumps and supplies to the left and right side traveling motors and disconnects an operation supplied to the traveling motor when the same is switched by a pilot signal pressure, and an option apparatus control valve which is switched concurrently with the straight traveling control valve by a pilot signal pressure and controls an operation oil supplied from one side hydraulic pump to an additional option apparatus.

Description

technical field [0001] The present invention relates to a hydraulic system for an option apparatus (option apparatus) of heavy equipment, when an additional apparatus (referred to as a brake) is additionally installed on a small excavator, the hydraulic system uses a conventional linear motion control valve, which can be switched by switching An attachment that performs a certain job; in particular, the invention relates to a hydraulic system for a heavy equipment attachment that does not change the control provided to a travel motor or work implement in the event an attachment is additionally mounted to a small crawler excavator The structure of the control valve assembly of the working oil, the hydraulic system can control the working oil supplied to the additional device through the switching device switched together with the linear motion control valve. Background technique [0002] Such as figure 1 As shown, the conventional hydraulic system of heavy equipment includes...

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Problems solved by technology

[0004] However, in the case of operating with operating oil from the third hydraulic pump P3 by additionally installing an additional device on a small excavator suitable for a conventional hydraulic system, since the additional switching device that can supply operating oil to another additional device Connected to the front or rear of the linear motion control valve C4, or since the structure of the control valve assembly should be changed, the size of the corresponding parts is increased, and the working steps are increased, so that the manufacturing cost is increased

[0005] In addition, in order to install a control valve assembly having a large external dimension in a small excavator, a considerable space is required, and the workability of installing a large control valve assembly in a small space of a small excavator is reduced

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