Worm gear case for land leveler and land leveler

Abstract

The invention relates to a worm gear case for a land leveler. The worm gear case is used for transmitting power of a motor to a rotation gear which controls the rotation angle of a shovel blade. The worm gear case comprises a case body, a worm, a worm wheel, an output shaft and a brake device, wherein the worm is rotationally disposed in the case body, and a first end of the worm is in power connection to the motor; the worm wheel is rotationally disposed in the case body, and self-locking does not occur when the worm wheel and the worm are in engaged transmission; one end of the output shaftis connected with the worm wheel in a transmission mode, and the other end of the output shaft is in power connection to the rotation gear; and the brake device is disposed at a second end of the worm, can selectively brake the worm and can bear the impact load which is transmitted to the worm wheel by the rotation gear. The worm gear case has the advantages of being high in self-locking capacityand transmission efficiency, the occupied space of the braking device is small, the wear degree of parts is small, and the service life is long.

Description

technical field [0001] The disclosure relates to the field of engineering machinery, in particular to a worm gear box for a grader and a grader. Background technique [0002] When the motor grader is leveling the road surface, the turning circle that controls the rotation angle of the blade does not move, and the blade maintains a certain angle to level the road surface. At this time, the worm gear box needs a braking device to lock the blade. The power required for the rotation of the grader blade is provided by the worm gear box. Therefore, when the grader is moving, when the blade is subjected to a large impact, the impact load may pass through the transmission mechanism of the grader to the gear transmission in the worm gear box. The mechanism or the worm gear mechanism will cause damage, so the worm gear box needs to be equipped with a protective device to prevent the worm gear from being too impacted. [0003] For impact loads, most of the current schemes use the self...

AI Technical Summary

Problems solved by technology

The relevant protective device is installed on the worm wheel and the output shaft, and its function is to prevent the impact of the blade from damaging the worm gear. However, due to the large torque acting on the worm wheel, the protective device needs to provide a large protective torque, so there are often friction plates Severe wear and tear, requiring frequent replacement of friction linings

There are also some protective devices that use hydraulic motors for braking, but this will make the structure of the hydraulic system more complicated, and increase the torque and impact carried by the hydraulic motors

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