Power transmission mechanism capable of independently automatically eliminating backlash

Abstract

The invention relates to a power transmission mechanism capable of independently automatically eliminating a backlash, which comprises a motor (2), an intermediate shaft (5), and two output shafts (9,23), wherein the motor (2) drives the intermediate shaft (5); two bevel wheels (33,34) on the intermediate shaft (5) drive the two output shafts (9,23) through sliding bevel wheels (16,24) on the two output shafts; and two output gears (11,22) arranged on the two output shafts (9,23) are meshed with a rack (32) for power transmission. The power transmission mechanism is characterized in that the two output shafts (9,23) are respectively provided with a group of spring backlash eliminated structure. The power transmission mechanism has the advantages that: the backlash or interference trend between two output shaft gears and the rack is separately compensated by pushing the sliding bevel gears through a disc spring on respective output shaft, additional rotation of the intermediate shaft cannot happen in the compensation process, additional ruleless interference cannot happen in the process that the servo motor drives the output shafts to work, and the transmission stability and the positioning accuracy of a working table are ensured.

Description

technical field [0001] The invention relates to a power transmission mechanism for moving a workbench of a gantry mobile numerical control machine tool processing center relative to a base, in particular to a power transmission mechanism capable of independently and automatically eliminating backlash. Background technique [0002] The gantry mobile machining center is used for rough and fine machining of large parts. It has the characteristics of strong bearing capacity, large stroke, and high precision. It can perform various processes such as milling, boring, drilling, and tapping. After completing multiple processes, it is also possible to perform three-dimensional processing on large molds, with high efficiency and good processing accuracy. The basic type of the machine tool is a fixed worktable for loading workpieces and a mobile gantry. The gantry is driven by two X-axis worktables to move synchronously. Since each X-axis has a long stroke, it is difficult to use ball ...

AI Technical Summary

Problems solved by technology

In this way, when the feed load of the workbench increases, the feed resistance will inevitably increase, and at the same time, the anti-backlash force will decrease accordingly, and the preload between the anti-backlash tooth surfaces will also decrease. When it is equal to the total force of the disc spring, the anti-backlash force will even be reduced to zero, and there is no preload between the anti-backlash tooth surfaces. At this time, the anti-backlash effect will disappear, and there will be a gap between the rack and pinion, which will seriously affect the Rigidity and stability of table movement

[0010] 3. The power of the reduction box is transmitted to the combined gear through the gear of the reduction box, and then drives the intermediate shaft to the two output shafts. The transmission chain is long and the transmission rigidity is affected to a certain extent.

Moreover, the anti-backlash structure of the combined gear is an axial rigid anti-backlash, which can only ensure that the minimum gap between it and the gear teeth of the reduction box is zero, and cannot guarantee that all the gaps between the two teeth are eliminated, so the transmission chain inside the transmission box There is a certain transmission gap, which cannot be eliminated by the intermediate shaft, which affects the stability of the entire transmission system, especially the backlash of the workbench.

Images