Establishment of Fuel Economy Estimation Method Focused on Transmission Efficiency of Rubber Belt Type CVT

Shirasuna, Takamori; Hatakeyama, Ryoh; Sakai, Yukio

doi:10.4271/2016-32-0036

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…Frictional loss in the transmission system of CVT driven scooter affects the fuel economy. The centrifugal clutch running with worn out friction liners plays vital role in decreasing fuel economy [12], [15]. The fuel economy tests have been carried out for the vehicle under test and comparative study between clutch with normal friction liner and clutch with grooved friction liner has been presented in Figure 12.…”

Section: Fuel Economymentioning

confidence: 99%

“…Since the friction characteristics of the clutch are controlled by acquired factors such as riding habits and the environment, it is difficult to predict ideal friction characteristics under all conditions. Further, centrifugal clutches play a vital role in dropping transmission efficiency and so as the fuel economy of CVT scooters [15]. The deteriorated condition of clutch friction liners affects the fuel economy drop with a contribution of 62.40% [12].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on Performance Characteristics of Dry Centrifugal Clutch with Grooved Friction Liners

Panchal

Patel

Gohil

2023

Int. J. Automot. Mech. Eng.

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The deteriorated condition of friction liners after prolonged use is one of the primary causes of judder in centrifugal clutches. The friction characteristics can be retained by generating specific textures or grooves on the friction liner. An attempt has been made to study the characteristics of centrifugal clutch using grooved friction liners. A test cycle for centrifugal clutch has been developed using a number of engagements as the basis. A vehicle test bench was used for the experiment where the developed test cycle was automated. The performance characteristics of the centrifugal clutch have been recorded and analyzed with normal friction liners and grooved friction liners for 100 test cycles. For this study, the groove area ratio was retained at 0.15, and the grooves were cut at 90°. After completing 100 test cycles, the clutch with a grooved friction liner exhibited better characteristics. After completing 100 test cycles, the surface roughness reduction at the leading section of the grooved friction liner and normal friction liner has been found to be 6.44% and 8.11%, respectively. The thickness reduction at the leading section of the grooved friction liner and normal friction liner has been reported to be 3.73% and 4.98%, respectively. Throughout the run of 100 test cycles, the higher clutch housing temperature has been witnessed in the case of a clutch with a grooved friction liner. At the 100th test cycle, the clutch torque with a grooved friction liner was 15.22% more than the clutch torque with a normal friction liner. Even after prolonged use, the clutch with grooved friction liner exhibited better judder characteristics and also provided higher fuel economy for vehicles.

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Section: Fuel Economymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Performance Characteristics of Dry Centrifugal Clutch with Grooved Friction Liners

Panchal

Patel

Gohil

2023

Int. J. Automot. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…Even after extensive design considerations, centrifugal clutches play vital role in dropping transmission efficiency and so as the fuel economy of scooters [3]. Deteriorated condition of clutch liners affects the fuel economy drop with a contribution of 62.40% [4].…”

Section: Figure 1 Centrifugal Clutchmentioning

confidence: 99%

Development of Test Cycle for Centrifugal Clutch of CVT Driven Scooters Intended for Urban Traffic Conditions

Panchal

Patel

2022

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The present study deals with the development of a test cycle for the centrifugal clutch of continuously variable transmission (CVT) driven scooters. Centrifugal clutch experiences different duty cycles during the usage of scooters in city traffic and highways during its lifetime. Since the friction characteristics of the centrifugal clutch are controlled by acquired factors, it is difficult to predict ideal friction characteristics under all conditions. The wear of friction lining increases due to heat generated in the clutch assembly because of the repeated “stick-slip” phenomena. Therefore, an attempt has been made for developing à new test cycle by keeping the engagement frequency as a reference. Road load data for three different riding conditions have been collected and analyzed. The developed test cycle has been automated on the centrifugal clutch test bench and a new set of clutch liners was tested thoroughly. The surface roughness, thickness, and wear of clutch liners have been observed and evaluated against the field vehicles. For the surface roughness, maximum deviations of 3.74%, 3.36%, and 2.16% have been observed for trailing, middle and leading sections of clutch liners respectively. For the thickness, maximum deviations of 3.06%, 2.59%, and 3.14% have been observed for trailing, middle and leading sections of clutch liners respectively. The developed test cycle demonstrates a good correlation with field use.

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Design and control of a hydro-mechanical transmission for all-terrain vehicle

Luo

Wei

et al. 2020

Mechanism and Machine Theory

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Establishment of Fuel Economy Estimation Method Focused on Transmission Efficiency of Rubber Belt Type CVT

Cited by 6 publications

References 5 publications

Experimental Investigation on Performance Characteristics of Dry Centrifugal Clutch with Grooved Friction Liners

Experimental Investigation on Performance Characteristics of Dry Centrifugal Clutch with Grooved Friction Liners

Development of Test Cycle for Centrifugal Clutch of CVT Driven Scooters Intended for Urban Traffic Conditions

Design and control of a hydro-mechanical transmission for all-terrain vehicle

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