Advanced SearchSearch Tips
Improved Design of Hydraulic Circuit of Front-end Loader for Bump Shock Reduction of an Agricultural Tractor
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : Journal of Drive and Control
  • Volume 13, Issue 2,  2016, pp.10-18
  • Publisher : Korea Society of Fluid Power & Construction Equipments
  • DOI : 10.7839/ksfc.2016.13.2.010
 Title & Authors
Improved Design of Hydraulic Circuit of Front-end Loader for Bump Shock Reduction of an Agricultural Tractor
Cho, Bong Jin; Ahn, Seong Wook; Lee, Chang Joo; Yoon, Young Hwan; Lee, Soo Seong; Kim, Hak Jin;
  PDF(new window)
A front-end loader (FEL) mounted on an agricultural tractor is one of the most commonly used implements to mechanize routine agricultural tasks. When the FEL is used with a loaded bucket, careful operation is required to maintain safety and avoid spillage when the tractor passes a bump because a change in the gravity center of the tractor due to varied loadings can affect the stability of the tractor. Use of a boom suspension system consisting of accumulators and orifice dampers can be instrumental in reducing pitching vibrations while increasing the handling performance of the FEL-mounted tractor. The objective of this research was to reduce bump shocks by adding an orifice and a flow control valve to the original hydraulic circuit composed solely of accumulators. A simulation study was performed using the SimulationX program to investigate the effects of an accumulator and an orifice-throttle damper on bump shocks. Results showed that the peak pressure on a boom cylinder and the vertical acceleration of a bucket were significantly affected by use of both an accumulator and an orifice damper. In a field test conducted with a 75-kW tractor, the peak pressure of the boom cylinder, and the root mean square (RMS) vertical acceleration of the bucket and seat were reduced by on average, 23.0, 42.2, and 44.9% respectively, as compared to those measured with the original accumulator system, showing that an improved design for the accumulator hydraulic circuit can reduce bump shocks. Further studies are needed to design a tractor suspension system that includes the effects of cabin suspension and tires as well as dynamic analysis.
Accumulator;Shock reduction;Flow control valve;Front-end loader;Boom suspension;
 Cited by
P. A. Hansson, "Working Space Requirement for an Agricultural Tractor Axle Suspension", Biosystems Engineering, Vol. 81, No. 1, pp. 57-71, 2002. crossref(new window)

W. Bauer, "Hydropneumatic Suspension Systems", Springer Science and Business Media, pp. 19-66, 2010.

S. W. Ahn, H. J. Kim, S. S. Lee, D. S. Choi, "Study on Driving Shock Reduction of a Front End Loader by Accumulator", Korean Society for Agricultural Machinery, Vol. 19, No. 1, pp. 91-92, 2014.

C. L. Giliomee, and P. S. Els, "Semi-active Hydropneumatic Spring and Damper System", Jouranl of Terramechanics, Vol. 35, No. 2, pp. 109-117, 1998. crossref(new window)

S. Sarami, "Development and Evaluation of a Semi-active Suspension System for Full Suspension Tractors", Diss, Technical University of Berlin, 2009.

L. B. Janis, P. Vilnis, K. Eriks, M. R. Aivars, and M. Maris. "Hydropneumatic Suspension for Tractor Implement", Proceeding of International Scientific Conference, Engineering for Rural Development, pp. 372-376, 2012.

S. Yanhua, Z. Junfeng, Y. Jue, H. Xiaxu 2011, "Research on Test and Simulation of Hydro-pneumatic Suspension", IEEE Int. Conference on Consumer Electronics, Communications and Networks(CECNet), pp. 678-681, 2011.