Skip to main content
SpringerLink
Log in

Novel Self-Clamping Clutch Mechanism for Micro Electric Vehicle Transmission

  • Published:
International Journal of Automotive Technology Aims and scope Submit manuscript

Abstract

This paper deals with a novel clutch mechanism for transmission applications, which aims at easy application of the transmission as the micro-electric vehicle models expand in variety. The new mechanism actuated by the torque and rotational inertia of the traction motor instead of the conventional hydraulic or electronic actuator and features a simple structure compared to the conventional mechanism. The operating principle, structure and mathematical modeling of the new clutch mechanism are presented, and verification of mathematical modeling was done through comparison of experimrntal and analytical results. To investigate the automotive suitability of the new clutch mechanism, the shift characteristics are analyzed by longitudinal directional vehicle dynamic model applying new clutch mechanism. As a result of the analysis, it was confirmed that the shift shock absorbing ability and required time for shifting are applicable to the vehicle transmission.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Abbreviations

A v :

front projected area of the vehicle

C D :

damping coefficient of the clutch shock absorber

C R :

rolling resistance coefficient

C T :

damping coefficient of the tire

F :

force acting perpendicular to the tooth surface of the worm

F n :

worm lead angular component of the axial component of F

F a :

Axial component of force acting on tooth surface.

F t :

pitch circle tangential component of force acting on tooth surface

J i :

moment of inertia of the power input part

J o :

moment of inertia of the power output part

J m :

moment of inertia of traction motor

J gm :

moment of inertia of gear gm

J L1 :

moment of inertia of gear L1

J H1 :

moment of inertia of gear H1

J gf :

moment of inertia of gear gf

J L2 :

moment of inertia of gear L2

J H2 :

moment of inertia of gear H2

J D :

moment of inertia of differential gear case

J W :

moment of inertia of the rim, half drive shaft and half tire

J v :

moment of inertia of vehicle equivalent rotational mass

K C :

torsional stiffness of the clutch mechanism

K R :

coefficient of virtual rotation spring

K l :

coefficient of clutch disk clamping spring

K D :

stiffness of the clutch shock absorber

K H :

stiffness of the drive shaft

K m :

stiffness of the motor shaft

K T :

stiffness of the tire

K RH :

virtual torsion spring coefficient of clutch mechanism CH

K RL :

virtual torsion spring coefficient of clutch mechanism CL

S D :

air resistence coefficient

T i :

torque acting on the power input part

T o :

torque acting on the power output part

T c :

transmitted torque by clutch mechanism

T cc :

transmitted torque by friction clutch disk

T cw :

transmitted torque by worm tooth contact

T m :

input torque of traction motor

T CL :

transmitted torque through clutch mechanism CL

T CH :

transmitted torque through clutch mechanism CH

T v :

running resistance torque applied to the vehicle wheel

a :

road slope angle

m v :

vehicle mass

p :

relative angular displacement of the clutch mechanism at stick condition

r c :

effective radius of friction clutch

r w :

pitch circle radius of worm

r t :

tire radius

α :

worm lead angle

β :

torsional damping coefficient of the clutch mechanism

ϕ i :

angular displacement of power input part

ϕ o :

angular displacement of power output part

ϕ R :

relative angular displacement of power input/output part

ϕ T :

maximum elastic deformation angle in the rotational direction of the clutch mechanism

ψ :

pressure angle of worm tooth

μ c :

friction coefficient of clutch disk multiplied by contact surface number

μ w :

friction coefficient of worm & worm gear contact surface

γ L1 :

ratio of radius of gear gm and gear L1

γ H1 :

ratio of radius of gear gm and gear H1

γ L2 :

ratio of radius of gear gf and gear L2

γ H2 :

ratio of radius of gear gf and gear H2

ϕ m :

angular displacement of traction motor

ϕ gm :

angular displacement of gear gm

ϕ gf :

angular displacement of gear gf

ϕ D :

angular displacement of differential gear case

ϕ W :

angular displacement of rim

ϕ v :

angular displacement of tire

ϕ rL :

relative angular displacement of power input/output part of clutch mechanism CL

ϕ rH :

relative angular displacement of power input/output part of clutch mechanism CH

ρ air :

air density

References

  • Duncan, J. R. and Wegscheid, E. L. (1985). Determanants of off-road vehicle transmission ‘shift quality’. Applied Ergonomics 16, 3, 173–178.

    Article  Google Scholar 

  • Haessig, D. and Bernard, F. (1990). On the modeling and simulation of friction. J. Dynamic Systems, Measurement, and Control, 1482, 1256–1261.

    Google Scholar 

  • Khurmi, R. S. and Gupta, J. K. (2005). A Textbook of Machine Design. Eurasia Publishing House (Pvt.), Ltd. New Delhi, India.

    Google Scholar 

  • Kim, Y., Lee, H., Kim, B., Kim, H., Byeon, S. and Park, J. (2011). A feasibility study on 2 step shift system for EV. Spring Conf. Proc., Korean Society of Automotive Engineers, 2193–2196.

    Google Scholar 

  • Kulikowski, K. and Szpica, A. D. (2014). Determination of directional stiffnesses of vehicles’ tires under a static load operation. Eksploatacja i Niezawodnosc — Maintenance and Reliability 16, 1, 66–72.

    Google Scholar 

  • Nicola, F. D., Sorniotti, A., Holdstock, F. and Viotto, F. (2012). Optimization of a multiple-speed transmission for downsizing the motor of a fully electric vehicle. SAE Int. J. Alternative Powertrains 1, 1, 134–143.

    Article  Google Scholar 

  • Oh, J. W., Choi, S. B. and Kim, J. S. (2014). Driveline modeling and estimation of individual clutch torque during gear shifts for dual clutch transmission. Mechatronics 24, 5, 449–463.

    Article  Google Scholar 

  • Park, S. U., Kim, J. Y. and Yang, I. S. (2017). Rotation Velocity Synchronization Device for Transmission. Korea Patent. 10-1728440-0000.

    Google Scholar 

  • Sorniotti, G., Pilone, G. L., Viotto, F. and Bertolotto, S. (2011). A novel seamless 2-speed transmission system for electric vehicles: Principles and simulation results. SAE Int. J. Engines 4, 2, 2671–2685.

    Article  Google Scholar 

  • Ren, Q., Crolla, D. A. and Morris, A. (2010). Effect of transmission design on electric vehicle (EV) performance. J. Energy and Power Engineering 4, 3, 46–51.

    Google Scholar 

  • Wu, G., Zhang, G. and Dong, Z. (2013). Impacts of twospeed gearbox on electric vehicle's fuel economy and performance. SAE Paper No. 2013-01-0349.

    Google Scholar 

  • Walker, P., Zhu, B. and Zhang, N. (2017). Powertrain dynamics and control of a two speed dual clutch transmission for electric vehicles. Mechanical Systems and Signal Processing, 85, 1–15.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. School of Mechanical, Aerospace & System Engineering, KAIST, Daejeon, 34141, Korea

    Seung-uk Park & Kyung-woong Kim

  2. Energy System R&D Center, Korea Automotive Technology Institute, 303 Pungse-ro, Pungse-myeon, Dongnam-gu, Cheonan-si, Chungnam, 31214, Korea

    Seung-uk Park, Byung-chul Na & Jin-yong Kim

Authors
  1. Seung-uk Park
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Kyung-woong Kim
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Byung-chul Na
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Jin-yong Kim
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Kyung-woong Kim.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Park, Su., Kim, Kw., Na, Bc. et al. Novel Self-Clamping Clutch Mechanism for Micro Electric Vehicle Transmission. Int.J Automot. Technol. 20, 147–156 (2019). https://doi.org/10.1007/s12239-019-0014-y

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s12239-019-0014-y

Key words

Search

Navigation