Synchronization Performance Evaluation Method of Synchronizer Ring

Abstract

When evaluating the friction property of a synchronizer ring 14 by pressing the synchronizer ring 14 against a gear cone 13 in a synchro unit testing machine 10, the present invention finds the torque transmission force due to an oil film formed between the friction surface of the synchronizer ring 14 and gear cone surface prior to contact. As a method of finding the torque transmission force due to the oil film, the torque value and rotation rate during time (A) from after the generation of torque, prior to the synchro friction surface and the gear cone surface making contact, and until the contact with the gear cone, are integrated with respect to time to calculate the initial absorbed energy, which is divided by the time (A) to find the initial absorbed energy velocity. The synchronizer ring is evaluated by that initial absorbed energy velocity.

Description

technical field [0001] The present invention relates to a synchronization performance evaluation method of a synchronizer ring used when switching gear stages of a transmission of a vehicle. Background technique [0002] The 16-speed transmission used in large trucks has a 2-stage subtransmission of Hi and Low on the front side of the 4-stage main body, and a 2-stage range change (range change) of Hi and Low on the rear side. ×4×2=16 levels. Auxiliary transmissions Hi and Low use range changes to switch between even-numbered gears and odd-numbered gears, thereby switching between 1-8 speeds and 9-16 speeds. [0003] Because the driver is required to shift gears quickly so that the speed of the vehicle does not drop too much, the air drive will move the sleeve at a high speed for switching between the even and odd gears of the subtransmission. [0004] During this shift, the shafts and gears with different rotational speeds are in contact with the tapered surfaces of the ge...

AI Technical Summary

Problems solved by technology

[0005] As for normal gear shifting, after the gears are synchronized with the synchronizer ring, the sleeve engages with the dogtooth of the gear, and the gear shifting is completed, but because if the synchronization of the synchronizer ring and the gears is slow, before the synchronization is completed , the adapter sleeve is inserted into the cogs of the gear, and contacts are made in a state where there is a rotation difference, which causes gear noise

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