Method and instrument for indirectly measuring pretightening force between conjugate bearings

Abstract

The invention discloses a method for indirectly measuring the pretightening force of matched bearings and a measuring apparatus and relates to the technical field of bearing measuring. The invention adopts an indirect measuring principle, applies continuously increased coaxial loads on the matched bearings to be measured through stepless loading, monitors the load exerted on the matched bearings to be measured through a pressure sensor and then judges whether an inner ring and an inner isolating sleeve of the matched bearings are contacted or not through a displacement sensor. The measuring apparatus consists of the displacement sensor (1), an upper locating seat(2), an outer isolating sleeve (4), the inner isolating sleeve (5), a locating mandrel (6), an air main shaft (7), a loading cylinder (8), a pressure regulating valve(9), the pressure sensor (10), a pedestal (11), a pedestal top plate (12) and an electrical system. The adoption of the measuring method and the measuring apparatus solves the measuring difficulty on the pretightening force of the matched bearings, provides reliable detecting and analyzing data for the assembly and use of the bearings and improves the assembly parameters and technique of the bearing components according to the data and improves the overall performances of the bearing components.

Description

Technical field [0001] The invention belongs to the technical field of bearing measurement, and particularly relates to a measuring method and a measuring instrument for indirectly measuring the preload of a pair of bearings. Background technique [0002] The pre-tightening force of the paired bearing is a very critical parameter, and its accuracy directly affects the performance of the paired bearing and even the host. The preload force is mainly used to produce a certain amount of pre-deformation during the original installation of the bearing, so that the bearing can skip the initial large stage of deformation in actual use and significantly improve the rigidity of the support. In addition, matched bearings are used in precision shafting, requiring high rotation accuracy, which can be met by applying preload. The preload tester can accurately and quantitatively measure the preload of the matched bearing to ensure that the stiffness, accuracy and speed of the bearing are in an ...

AI Technical Summary

Problems solved by technology

During the trial production and production process of the bearings, the pairing was performed only by measuring the protrusion of the bearings, and the pretightening force was applied by repairing the end face of the ring, but the actual pretightening force after pairing could not be tested and verified.

[0004] During the user's use, it reflects that the preload is not accurate enough, sometimes too large, sometimes too small; too large a preload affects the rotational flexibility of the shaft system, and too small a preload cannot meet the requirements of stiffness and rotation accuracy, so pairing The accuracy of the bearing preload has seriously affected the performance and reliability of the user's main engine, so domestic bearing manufacturers and bearing users urgently need to solve the problem of measuring the preload of paired bearings

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