Torque test tool for push back type torsion spring

Abstract

The invention relates to a tooling and fixture for testing torque of a reverse-thrusting torsion spring used in an automobile engine belt tensioning device. A torque testing tooling for the reverse-thrusting torsion spring comprises two coaxial tooling seats, cushion blocks are arranged in the centers of the tooling seats, the cushion blocks have helix angles, an outer sleeve is installed on each tooling seat, a positioning shaft is arranged between the two tooling seats, the two ends of the positioning shaft respectively penetrate through the outer sleeves and are fixedly arranged on the tooling seats at the two ends of the positioning shaft, the outer sleeves are installed on the tooling seats and braking bosses are arranged on the inner walls of the outer sleeves. The invention provides a tooling and fixture which can effectively prevent a testing result from being influenced by a reason that the two ends of the spring are firstly expanded during testing and can satisfy the demand of non-closed grinding of two end rings of the spring, and solves the technical problems that the torsional displacement of a middle working ring is changed and the torque of the spring cannot be accurately measured because the two ends of the spring are firstly expanded during reverse-thrusting spring torque testing in the prior art.

Description

Technical field [0001] The invention relates to a tooling fixture, in particular to a tooling used for testing the torque of a reverse thrust torsion spring used in a belt tensioner of an automobile engine. Background technique [0002] The reverse thrust type torsion spring is used in the belt tensioner of the automobile engine and is a key component of the belt tensioner. When in use, by adjusting the installation angle of the changing spring and the working torsion angle, the torsion spring can generate corresponding torque to achieve the function of adjusting the tension of the engine belt. [0003] In the published patent document, a device for fixing a spring used on a machine or instrument is disclosed, "Chinese Patent: A Fixing Device for Spring Torque Test (CN203231844U)", including a test base, a fixing device The first fixed support and the second fixed support on the test machine base; the first fixed support is provided with a movable disc, and the end surface of the ...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a tooling with simple structure, which can effectively prevent the test results from being affected by the first expansion of the two ends of the spring during the test, and satisfies the torsion test tool of the reverse push type spring whose coils at the two ends of the spring are not tightened and ground flat; it solves the problem of the existing There is a technical problem in the technology that when testing the torque of the reverse thrust spring, because the rings at both ends of the spring expand first, the torsional displacement of the middle working ring changes, and the torque of the spring cannot be accurately measured.

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