Differential screwed loader main cone pretightening force measuring set and method

Abstract

The invention relates to a device and a method for measuring the pretightening force of a main cone of a loader based on differential speed tightening, which is characterized in that the measuring device is provided with a work top, a sleeve, an inner spline, a transmission line 1, a transmission line 2, and a pretightening moment measuring mechanism, wherein the work top is taken as a preassembling bench of the main cone and a bearing pedestal and a bearing pretightening moment measuring bench; the sleeve is matched with an opening of a locknut and used for screwing up the locknut; the inner spline is matched with an outer spline on the tail of the main cone and used for driving the main cone to rotate; the transmission line 1 takes a servomotor as a driving piece and the inner spline as a driven piece; and the transmission line 2 takes a servomotor as a driving piece and a sleeve as a driven piece. The method adopts the means of differential speed tightening to well realize detection of the starting friction torque.

Description

technical field [0001] The invention relates to a device and method for measuring the pretightening force of a main cone in the assembly process of the main cone assembly of a loader. Background technique [0002] figure 1 Shown is the main cone assembly in a loader final drive. The bearings in the main cone assembly are a pair of inverted tapered roller bearings. When the loader is moving forward, the axial force on the main cone is borne by the lower bearing 5, and there is a gap between the rollers of the upper bearing 3 and the inner and outer rings. Tendency of disengagement; when retreating, the axial force on the main cone is borne by the upper bearing 3, and there is a tendency of disengagement between the rollers of the lower bearing 5 and the inner and outer rings. [0003] In order to improve the rotation accuracy of the main cone assembly, a certain preload should be applied to the main cone bearing. However, if the preload is too large, the frictional torque ...

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Problems solved by technology

[0007] 2. Manually use a spring scale to pull the bearing seat to rotate the bearing seat, then observe the force measured by the spring scale, and then multiply the force by the force arm to obtain the pre-tightening torque. During this measurement process, manually pulling the spring scale cannot guarantee The bearing seat rotates at a constant speed, the line of action of the force of the spring balance cannot be guaranteed to be on the same plane as the rotation plane, and the line of action of the force cannot be perpendicular to the radius of rotation at the point of action. Obviously, this method of roughly measuring the preload torque Can not meet the requirements of high-precision assembly;

[0008] 3. When measuring with a torque wrench, the main cone cannot be rotated at a uniform speed, and it is also affected by the rotation accuracy of the bearing, so the pre-tightening torque of the bearing cannot be accurately measured.

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