HYDRAULIC DRIVE SYSTEM APPLIED BLATHER TYPE VOLUME COMPENSATOR AND PERFORMANCE TESTER FOR BLATHER TYPE VOLUME COMPENSATOR

摘要

The present invention relates to a bladder-type volume compensator, a hydraulic driving system and to a performance tester of a bladder-type volume compensator. The bladder-type volume compensator according to the present invention comprises: a bladder (13) expanding or contracting to compensate for the volume change of working oil in the inner space of a housing body (11) into which the working oil changing volume at temperatures lower or higher than room temperature is introduced. The bladder-type volume compensator is applied to a discharge-type hydraulic driving system (1), which is composed of a discharge-type volume compensator (10) to discharge the working oil to the outside, or is applied to a circulating hydraulic driving system (101), which is composed of a sealed volume compensator (10-1) to restore the working oil to an oil reservoir (3). Therefore, the hydraulic driving system is protected from mechanical damage or deterioration in sealing performance, which can be caused by the volume change of the working oil, and cavitation caused by a decrease in pressure. Also, the performance of the bladder (13) can be tested simply using a performance tester including a hydraulic piston assembly (100) for expanding or contracting the bladder (13) by varying the pressure of the working oil.