Off-Road Chapter 1&2

Off-Road Chapter 1&2 - Chapter 1 Development of...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Chapter 1 Development of Off-Road Vehicles Types of Off-Road Vehicles Early off-road vehicles were powered by steam engines The first tractors were large and cumbersome ± Used for plowing and threshing ± Later adaptations allowed for use as a motor cultivator General-purpose tractor was then created to perform major farm operations Descriptive Classification ± Crawler ± Standard row-crop ± High-clearance ± Utility ± Orchard ± Lawn and garden ± Multipurpose ± Power tiller ± Tree skidder ± Skid-steer loader ± Four-wheel drive with smaller front steering wheels ± Four-wheel drive with equal-sized wheels and articulated frame steering • Based on steering method, arrangement of frame, and traction members
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Lawn Mower Riding Tractor Utility Tractor
Background image of page 2
3 Bull Dozer Tracked Tractor Skid Steer Loader
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Chapter 2 Engine Performance Measures Combustion Engines Two types: Spark Ignition (SI- gasoline), Compression Ignition (CI- diesel) Power in fuel ± Power from burning fuel ± Heating values measured by burning a sample of fuel in a calorimeter ± Less than ½ of fuel equivalent power is available at engine flywheel Power Flows in an Engine Engines may be rated by power, but power varies greatly depending on where it is measured. ± Tractors rated by their take-off (PTO) power ± If no PTO, then use drawbar power ± Large 4WD tractors
Background image of page 4
5 Power Distribution P fe is the fuel equivalent power P i is the indicated power P f is the power lost to friction P b is the brake power N it is the thermal efficiency N m is the mechanical efficiency Srivastava et. al., 1993, Eng. Principles of Agric. Machines, ASAE Fuel Equivalent Power Power embodied in the fuel: ± P fe = m f * H g / 3600 ± Where P fe = fuel equivalent power (kW) ± m f = fuel consumption rate (kg/h) ± H g = gross heating value of the fuel (kJ/kg)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 11/21/2011.

Page1 / 13

Off-Road Chapter 1&2 - Chapter 1 Development of...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online