Development of the Inner Spherical CVT for a motorcycle

Park, NG; Ryu, JH; Lee, HW; Jeon, YH; Zhang, N

Development of the Inner Spherical CVT for a motorcycle

Park, NG Ryu, JH Lee, HW Jeon, YH Zhang, N

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Publication Type:: Journal Article
Citation:: International Journal of Automotive Technology, 2009, 10 (3), pp. 341 - 346
Issue Date:: 2009-06-01

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Field	Value	Language
dc.contributor.author	Park, NG	en_US
dc.contributor.author	Ryu, JH	en_US
dc.contributor.author	Lee, HW	en_US
dc.contributor.author	Jeon, YH	en_US
dc.contributor.author	Zhang, N https://orcid.org/0000-0001-6408-0044	en_US
dc.date.issued	2009-06-01	en_US
dc.identifier.citation	International Journal of Automotive Technology, 2009, 10 (3), pp. 341 - 346	en_US
dc.identifier.issn	1229-9138	en_US
dc.identifier.uri	http://hdl.handle.net/10453/9257
dc.description.abstract	An Inner Spherical CVT (ISCVT) transfers engine power by utilizing the traction force of the lubricant fluid film on the contact point between concave and convex spherical rolling bodies. Since the concave and the convex contact surfaces of the ISCVT are exactly spherical parts, they have a large circular (not elliptic) contact area, and the ISCVT mechanism has a larger torque capacity, less spin loss, and better stability than other traction drive mechanisms. The IVT (Infinitely Variable Transmission) performances also can easily be embodied in the ISCVT. In this work, we developed a prototype of the ISCVT for a motorcycle with a 125cc single cylinder engine having a maximum torque of 13.73 Nm at 8,000 rpm. The design parameters were determined, and the transmission performances were evaluated by optimal design procedure. The transmission efficiency, the life time, the maximum severe stresses on each part of the ISCVT, and the work needed for varying speed ratio were theoretically investigated, and the efficiency performances were experimentally measured. The manufactured prototype was installed in an actual motorcycle, which was fixed on the test-bench equipped with a dynamometer. The parasitic loss of the prototype and the cross-sectional road load performance were tested. The power efficiency of the simulated prototype was between 87̃92%, and the life span was more than 50,000 hours. The tested overall power efficiency was around 70̃92% under frequent driving conditions, which is an impressive performance in a motorcycle transmission despite the small difference from the simulation. © 2009 The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg GmbH.	en_US
dc.relation.ispartof	International Journal of Automotive Technology	en_US
dc.relation.isbasedon	10.1007/s12239-009-0039-8	en_US
dc.subject.classification	Automobile Design & Engineering	en_US
dc.title	Development of the Inner Spherical CVT for a motorcycle	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	10	en_US
utslib.for	091302 Automation and Control Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	closed_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	10	en_US

Abstract:

An Inner Spherical CVT (ISCVT) transfers engine power by utilizing the traction force of the lubricant fluid film on the contact point between concave and convex spherical rolling bodies. Since the concave and the convex contact surfaces of the ISCVT are exactly spherical parts, they have a large circular (not elliptic) contact area, and the ISCVT mechanism has a larger torque capacity, less spin loss, and better stability than other traction drive mechanisms. The IVT (Infinitely Variable Transmission) performances also can easily be embodied in the ISCVT. In this work, we developed a prototype of the ISCVT for a motorcycle with a 125cc single cylinder engine having a maximum torque of 13.73 Nm at 8,000 rpm. The design parameters were determined, and the transmission performances were evaluated by optimal design procedure. The transmission efficiency, the life time, the maximum severe stresses on each part of the ISCVT, and the work needed for varying speed ratio were theoretically investigated, and the efficiency performances were experimentally measured. The manufactured prototype was installed in an actual motorcycle, which was fixed on the test-bench equipped with a dynamometer. The parasitic loss of the prototype and the cross-sectional road load performance were tested. The power efficiency of the simulated prototype was between 87̃92%, and the life span was more than 50,000 hours. The tested overall power efficiency was around 70̃92% under frequent driving conditions, which is an impressive performance in a motorcycle transmission despite the small difference from the simulation. © 2009 The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg GmbH.

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http://hdl.handle.net/10453/9257