Author: Zhoushan Rhine Machinery Manufacturing Co. Hulin Jun slewing gear is an important component on hydraulic excavators and cranes and other construction machinery rotary device. Because of its high frequency of use in the work, especially in the start or stop the movement bear greater impact load, so if the output pinion anti-loose device improper design, often in the operation of the output pinion off phenomenon, As a result, the whole machine can not work. In severe cases, the rotary support can also be damaged. At present, both domestic and foreign high-speed or medium-speed hydraulic motor drive, with a normally closed friction disc brake or brake with a normally open brake hoop rotary reducer, the rotary reducer output pinion locking device There are two main forms of structure. They each use countersunk head screw or shaft retaining ring as the main locking device. This structure is less susceptible to looseness, because when the reducer is frequently reversed or the machine to withstand greater impact, will lead to loose or loose ring countersunk head screw, causing reducer output pinion off ; Especially when there is a large gap between the spline on the output pinion and the connecting spline of the planetary carrier, the looseness of the countersunk head screw and the snap-off of the circling ring are faster; moreover, The pinion shaft is in the shape of big big and big small, so that the axial force is not uniform at each point. Once the gear on the output pinion is subjected to force, the locking device will bear a huge load due to the lever's action. Moreover, The gap between the splines is inevitable, so the carrier and the pinion inevitably exist in an instant in the process of positive and negative conversion in the opposite rotation; and axial clearance adjustment is not convenient. The above factors can lead to tooth shaft off. In order to prevent the output shaft of rotary reducer from falling off, our company improved the anti-loose device of output reducer output pinion. The improved device is shown in Fig. 3, that is, the lower part of the output pinion spline is machined out Threaded, assembly plus round nut 3 and washer washer 2, with a round nut to adjust the axial clearance of two single row tapered roller bearings. After the above improvements, compared with the slewing reducer structure, has the following advantages: 1, anti-loose device reliable, easy to appear loose phenomenon. 2, increased the axial distance between the two bearings. As the rotary reducer rotary bearing mainly by the two bearings to support the two bearing spacing increases, can increase the rotary speed reducer rotation stability and carrying capacity. Use round nut to adjust the axial clearance between the two bearings, easy to adjust and reliable. More to ensure the normal operation of slewing reducer. 3, the structure is simple, and the output of the lower spline shaft thread is processed in the output of the gear shaft once completed, the coaxiality of the two parts are guaranteed. The use of standard round nut to ensure that the output pinion and bearing and wheel frame with the rotation, so production, easy installation. Rotary reducer output pinion anti-drop device improvements 4, long service life. Improved anti-loose device has been used for more than two years, so far found no output gear shaft loss caused by reducer failure. The device has been national patent (patent number: zl.3)
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