Papers by Author: Jing Xu

Abstract: In order to improve the join fastness of silent chain, a new silent chain assembly method is proposed. It increases the capability that the silent chain stands against transverse vibration, reduces the meshing noise of silent chain without changing the space size of silent chain, by replacing the installing of outer link plate and pin as a press-fit configuration, and taking wire lock on the joint. The result of extrusion force comparative experiment showed that the extrusion force of outer link plate press-fit configuration was 2.5 times than gasket press-fit configuration. Through the platform contrast test, a noise test of two types of silent chain were made at the same speed, the result showed that the new silent chain drive more smoothly than the traditional one, the average noise level was decreased by 1.5dB. The two test results verified that the new silent chain assembly method is validity.

Abstract: Evaluation and measurement of form errors distributed on 3D ground curved surface are proposed due to the difficulty of processing measured points of 3D ground curve surface in comparison with axisymmetric curved surface. First form curved surface grinding is conducted by arc-shaped diamond grinding wheel, second ground curved surface is measured by contact measurement to obtain 3D measuring data, next transfer mode from CNC grinding to measuring reference frames is established, then effective and applicable 3D compensation arithmetic for probe sphere error is introduced, finally 3D form errors are investigated in connection with reference frame transfer and probe sphere compensation. It is confirmed that form error PV of is improved form 203 m / 8 cm2 is obtained by using reference frame transfer and probe sphere compensation, enhancing measuring accuracy by about 29 %.