Method for testing service life of friction clutch of torque backlash type gearshift mechanism

Abstract

The invention discloses a method for testing service life of a friction clutch of a torque backlash type gearshift mechanism. The method comprises the following steps of S1, detaching one or a plurality of members in a low-speed-gear driving tooth, low-speed-gear driven tooth and an overrunning clutch; S2, connecting an input shaft with a driving motor, and locking an output shaft; S3, setting a rotating speed parameter and a highest cycling number-of-times Nmax of the driving motor; S4, setting testing end conditions of a, time ratio of a period in which Tm is smaller than or equal with Tdn_min/i2 in a rotating speed increase period of the driving motor exceeds deltax, wherein Tm is the torque of the driving motor, Tdn_min is a gear shifting-down torque allowable range lower limit value,i2 is a high-speed-gear transmission ratio of the torque backlash type gearshift mechanism, and deltax is a preset value; b, the cycling number-of-times Nx of the driving motor satisfies a condition of Nx=Nmax; and S5, starting the driving motor, and ending testing when a random condition the step S4 is satisfied. The method according to the invention has advantages of simplifying a testing deviceand a testing flow, reducing testing cost, and improving testing efficiency and testing precision.

Description

technical field [0001] The invention belongs to the technical field of transmission testing methods, and in particular relates to a friction clutch life testing method of a torque return differential shift mechanism. Background technique [0002] The Chinese patent with the application number 201410269833.8 discloses a torque return differential shift mechanism, which is a new type of automatic shift mechanism applied to automatic transmissions. One of the main failure forms is the wear of the friction clutch The resulting downshift torque is reduced, therefore, during product development, it is necessary to test the life of the friction clutch. At present, transmissions using torque return differential shift mechanisms are mainly used in electric vehicles. The life test methods of friction clutches include road tests and bench tests. If the method of loading road tests is adopted, it will not only consume a lot of manpower and material resources, and the test cycle will be...

AI Technical Summary

Problems solved by technology

If the method of loading road test is adopted, it will not only consume a lot of manpower and material resources, and the test cycle will be longer, but also the consistency and reliability of the test results will be affected due to changes in the driver's operating habits and road traffic conditions.

If the bench test method is used, the existing conventional vehicle transmission test bench is designed to simulate the road conditions of the whole vehicle, which not only has a complex structure, high cost, but also consumes a lot of power, and the test efficiency is low.

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