1/25/2024 0 Comments Small motorbikeSo, from left to right, you see the rpm, and from down to top, you see the torque. The place on the x-axle shows at which rpm that torque is delivered. The height of that line shows the amount of torque. The torque curve shows an x and y axle and a line. The gearbox transmits the rotation of the crank onto (ultimately) the wheels.īMW R1100GS: the lines above show the torque the lines below the power (different scale) Torque curve ![]() The rpm where the maximum torque is delivered, is the rpm where the fuel is burned most efficiently: it is at that rpm that the piston delivers the maximum torque on the crank. And when your motorcycle has more than one cylinder, the torque of the individual pistons add up. The torque at a certain rpm is the average torque that the piston delivers during the revolution stroke. Maximum torqueĪ piston, therefore, delivers a varying amount of torque. In technical specifications of motorcycles, you often see a number for the maximum torque, and the numer of revolutions per minute at which that torque is delivered (in rpm, revolutions per minute). The amount of torque is expressed in Newton meters: Nm. See for instance the How Stuff Works site. The distance between the pedal to the rotation point is comparable to the distance between the crank and the middle point of the crankshaft, and in the same way as in the bicycle example, the distance "counts" for 100% when the point of the crank that is connected to the rod has an angle of 90 degrees with the direction of the piston, and for 0% when that point is in the highest or the lowest position. The force that you apply to the pedal, with your leg muscles, is comparable with the force that is applied by the piston on the crank. When you try to compare that system to the bicycle example, you would compare the rotation point between connecting rod and crankshaft with the bicycle pedal. The piston moves up and down, and the force for that comes from the fuel that is burned.Ĝonnected to the piston is a rod, the connecting rod, and that rod is connected (with the ability to turn) to the crankshaft. OK, you say, but where is the torque in a motorbike? Twice a piston and a crank: long stroke versus short stroke Piston and crank ![]() The distance counts for 100% when the pedal points forward, and counts for 0% when the pedal is at the lowest point, or at the highest point. The distance is related the distance between the pedal and the axle, but things are slightly more complicated: The rotation point is the axle of the pedal. In this case, the force is the force you apply to the pedal, with your leg muscles. Pedals on a bicycleĬycling on a bicycle also has to do with torque. In short: torque (or moment) is force times moment arm. Two people on a seesaw are in balance if the torque has the same amount at both sides: the force is formed by their weight and gravity, and the torque is formed by that force, multplied by the distance to the middle of the seesaw. The solution tells something about torque: torque is a measure for the force that is applied on a lever, multiplied with the distance to the rotation point. If the person on one side weighs 200 pounds, and the person on the other side weighs 50 pounds, you have a problem which you can solve, as you probably still know from your life as a toddler: the heavier person has to sit closer to the middle of the seesaw to reach a balance.
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