Small-modulus gear backlash detection method

Abstract

The invention discloses a small-modulus gear backlash detection method. The method comprises the steps of rotating a driven gear till a test surface is in a horizontal state, determining an initial angle [theta] 0 to be 90 degrees, enabling a probe of a dial indicator to vertically abut against a test initial point on the surface of the test surface, recording the position data of the test initial point as (x0, y0), enabling the dial indicator to return to zero, enabling y0 to be equal to R at the moment, rotating the driven gear until one surface on a meshing tooth of the driven gear is meshed with a driving gear, recording the current data [delta]y of the dial indicator, substituting the known parameters R, [theta] 0, [delta]y and x0 into the formula, and solving the normal inclination angle [theta] 1 of the test surface; and by knowing the radius r of the reference circle of the gear, measuring the gear backlash l according to the following formula: I=r*abs([theta]1-[theta]0). According to the invention, the small-modulus gear backlash can be accurately measured without extending a probe of the dial indicator into the gear backlash, the implementation means is simple and convenient, too many auxiliary testing tools are not needed, to-be-measured parameters are few, and the cost is low.

Description

technical field [0001] The invention belongs to the field of gear detection, in particular to a method for measuring the backlash of small modulus gears. Background technique [0002] When the gears are engaged in transmission, in order to form a lubricating oil film between the meshing tooth profiles and avoid seizure due to heat and expansion of the teeth due to friction, there must be a gap between the tooth profiles. This gap is called the tooth side clearance, or side clearance for short. In order to ensure the formation of a normal lubricating oil film between the tooth surfaces and prevent gear teeth from being stuck due to thermal expansion and deformation caused by the increase in the working temperature of the gear, the gear teeth must have an appropriate backlash when meshing. Therefore, in the gear inspection project, it is often necessary to detect the gear backlash to ensure the normal transmission of the gear. [0003] At present, the conventional gear backla...

AI Technical Summary

Problems solved by technology

In this assembled gear pair, the method of fixing one gear and then measuring the circumferential sway of the other gear (in terms of the arc length on the indexing circle) has the existence that when the gear modulus is small, the gear tooth spacing is small, and the distance between the gear teeth is small. The meter probe is relatively large and cannot be inserted into the gear gap, or it can be inserted but the tooth surface is small, and it is impossible to accurately measure the runout at the indexing circle. Therefore, a method that can accurately measure the backlash of small modulus gears is needed

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