In engineering machinery, mining machinery, construction machinery, etc., often using low speed high torque motor to drive the walking or promotion agencies. There are a few of low speed high torque motor is axial plunger, majority is radial plunger, radial piston hydraulic motor as to balance the part or all of the effect on its rotor under high and low pressure chamber of hydraulic force and size and quality of this kind of motor, so it is the characteristics of the torque is big, can be operated under high power output at low speed. So often don't need or use very simple reduction gear can be connected to the work mechanism, so as to simplify the machine.
At present, the industrial and mining enterprises using the radial plunger type low speed high torque motor many varieties and types, according to its working principle and structure form can be divided into the crankshaft connecting rod type, static balance type and inner curve of acting several more.
Curve within the role type hydraulic motor with big transmission torque, torque ripple is small, quality is small, compact structure, start the advantages of higher efficiency. Therefore, it is the most widely used low speed high torque hydraulic motor. Therefore, this article within curve, with emphasis on the role type hydraulic horse, to discuss the use of low speed high torque hydraulic motor and maintenance.
Motor in normal use, should first of all, should guarantee the low speed high torque motor have enough oil return back pressure. Back pressure should be to guarantee the stability of hydraulic motor when no-load operation, the minimum output pressure. Usually should be with the increase of rotational speed, the corresponding increase oil return back pressure value of the motor. Secondly, hydraulic motor due to the bad wear or seal the ageing seal leakage increase, or mechanical friction resistance is too large, hydraulic motor flow instability, torque ripple, causing the appearance of the crawling phenomenon. Operation don't long time at the lowest stable speed in the following work. Because, when entering the motor at low speed flow less, leakage for a larger proportion, cause the volumetric efficiency is reduced, leading to crawl. General type hydraulic motor curve more action within the lowest stable speed can reach 0.1 1 r/min.
Again, for the continuous operation of the hydraulic motor, in order to avoid the motor shell in continuous operation in the high temperature caused by friction pair wear gap is too big, cause of large discharge, casing pressure, leakage to the outside of the shell. Thus cause the reduce of volumetric efficiency, must be cooled flushing, flushing oil can take away the motor internal impurities, and the radial sealing ring has a cooling effect. Flush loop should be independent of the system