NDLI: Improvement of Transmittable Torque of CVT Using Hybrid V-Belt Under Lubricated Condition

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Asahi, Takayuki Okubo, Kazuya Fujii, Toru Sakanaka, Hiroyuki Kido, Ryuichi Takahashi, Mitsuhiko
Copyright Year	2007
Abstract	The purpose of this study is to show the effective method to increase the transmittable torque for continuously variable transmissions (CVT) using hybrid block V-belts under lubrication. The influence of belt geometry on the maximum transmittable torque of CVT was discussed while four types of belt were used, having different dimensions of either upper or lower arms of H-shaped blocks. The effect of lubrication between the belt and the pulley on the transmittable torque was investigated based on the Stribeck curve in order to examine the change of frictional state of contact surface and the power transmitting efficiency. The micro-grooving technique was also applied to the CVT blocks to obtain the high transmittable torque and stable lubrication. The test results suggested that the maximum transmittable torque was expected at a high belt velocity condition if the positive projection of the tension members exists for CVT even under the lubricating condition. The lubricant state between the belt and the pulley should be divided into three modes based on the Stribeck curve; boundary lubrication mode, mixed lubrication mode and hydrodynamic lubrication mode. Both higher transmittable torque and power transmitting efficiency are achieved if the boundary lubrication mode is kept. The micro-grooving technique applied to the contact surface of the blocks also contributed to increase the maximum transmittable torque for CVT using hybrid V-belts when CVT was operated at high belt velocity.
Starting Page	71
Ending Page	76
Page Count	6
File Format	PDF
ISBN	0791843106
DOI	10.1115/IMECE2007-41702
e-ISBN	0791838129
Volume Number	Volume 16: Transportation Systems
Conference Proceedings	ASME 2007 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2007-11-11
Publisher Place	Seattle, Washington, USA
Access Restriction	Subscribed
Subject Keyword	Geometry Torque Pulleys Lubricants V-belts Belts Dimensions Tension Lubrication Boundary lubrication
Content Type	Text
Resource Type	Article

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