A novel continuously variable transmission with logarithmic disc generatrix

Li, Qingtao; Li, Hua; Yu, Deping; Yao, Jin

doi:10.1016/j.mechmachtheory.2015.07.001

Cited by 21 publications

(16 citation statements)

References 15 publications

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“…By particular design, it can be inferred that the transmission ratio range of the Logarithmic CVT is as wide as that of the Toroidal CVT which is about 4.0 to 6.0 as mentioned in [4,[28][29][30]. This conclusion is different from that of [24] because the latter one is under the assumption of = /3.…”

Section: Determination Of the Geometrical Parametersmentioning

confidence: 83%

“…where , , and are the three parameters of the Logarithmic CVT: transmission ratio range, half-cone-angle, and conformity ratio, respectively. As (24) shows that the range of transmission ratio depends on the values of and , which is a particular characteristic of the Logarithmic CVT relative to the Toroidal CVT.…”

Section: Determination Of the Geometrical Parametersmentioning

confidence: 93%

“…However, because the low value of may cause a severe contact condition, = 0.5 is adopted. According to (24), we can obtain the expression for :…”

Section: Design Casementioning

confidence: 99%

“…Meanwhile, a new type of double roller Full-Toroidal variator, proposed by De Novellis et al [22], is proved to have a higher efficiency than that of the original Toroidal CVTs because it can decrease the magnitude of the spin losses. Although these studies have improved the efficiency to some extent, further improvement is difficult because the working surface of their input disc and output disc is a spherical surface which causes the spin losses that could not be totally eliminated in the full-transmission ratio range [23,24]. Recently, a Logarithmic CVT, which is able to eliminate the spin losses in the full-transmission ratio range, has been proposed by us [24].…”

Section: Introductionmentioning

confidence: 99%

“…Although these studies have improved the efficiency to some extent, further improvement is difficult because the working surface of their input disc and output disc is a spherical surface which causes the spin losses that could not be totally eliminated in the full-transmission ratio range [23,24]. Recently, a Logarithmic CVT, which is able to eliminate the spin losses in the full-transmission ratio range, has been proposed by us [24]. The novel CVT replaces the original working surface with the new surface derived from a differential equation and has been proved to have a better performance than the Half-Toroidal CVT.…”

Section: Introductionmentioning

confidence: 99%

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The efficiency of the original Toroidal continuously variable transmission (CVT) is limited due to the spin losses caused by the different speed distribution in the contact area. To overcome this drawback, this paper replaces the original working surface with a new surface derived from a differential equation and proposes a novel Logarithmic CVT. Equations and ranges of the transmission ratio range, half-cone-angle, and conformity ratio, which are essential geometrical parameters of the Logarithmic CVT, are derived. A set of geometrical parameters is further recommended. With such geometrical parameters, the transmission ratio range of the Logarithmic CVT is as wide as that of the Half-Toroidal CVT. The two types of CVTs are compared with each other in terms of efficiency based on a widely accepted computational model. The results show that efficiency of the Logarithmic CVT is higher than that of Half-Toroidal CVT except for some particular situations because of the thrust bearing losses.

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