One measurement approach of tooth-tooth transmission error(TE) containing the meshed pitch deviation(MPD) was derived from the concept of the total transmission error in gear driving

and the TE offset formula of the effect of the MPD was proposed with the geometric relationship of the gear surface and the MPD.Then

the TE result of hypoid gears was obtained through the measurment experiments built on the platform of Y9550 type rolling tester.Finally

the TE curve was simulated by the MPD data gained by the JD45+gear measurement center

and the meshing state of gear teeth was analyzed.The effect of MPD on TE was verified by the contrast of the theory and practical TE curve.Experimental results show that the actual tooth-tooth TE curve can be replaced by the theoretical curve which includes the meshed pitch deviation at light loads

so as to lay the foundation for further study of the movement accuracy and stability of the gear transmission under actual working condition.