## Testing standard of bicycle pedal

Posted On 24th January 2017 at 1:03 pm in Uncategorised

Pedal, what is it? That is, on certain machines or parts of machinery that are designed for footing. The most common bike is. Texture is generally nylon plastic, but there are professional bicycle which is used in aluminum, magnesium alloy, etc. Foot pedal is divided into bearing and ball-type pedal Do not look at this stuff is very small, in fact, it is an equal arm lever. It is the middle of the axis is divided into two parts, the distance on both sides of the same buy drill machine, so that the human foot in the case of non-stop pedal rotation is still able to maintain a want to state before and after hard, do not adjust the foot back and forth position. Incidentally, this part is the most solid on the bike, and every time you get off the taxi, the body’s weight is pressed on top, can imagine the degree of solid foot pedal. Gear ratio: the ratio of the number of teeth of the driven wheel to the driven wheel is the gear ratio.

If the two gears have the same number of teeth, then pedal a week. The two gears and the rear wheels rotate one each. If the number of teeth of the driven gear is greater than the number of teeth of the driven gear, then the number of revolutions of the driven gear per revolution is greater than one week, and the speed is increased. Therefore, the gear ratio is proportional to the number of teeth of the drive wheel and inversely proportional to the number of teeth of the driven gear. G represents the gear ratio, C represents the number of gear teeth, F represents the number of passive gear teeth, the relationship between them expressed by the formula, namely: g = c / f For example: the car is 49 teeth, the flywheel is 14 teeth, into the formula can be obtained gear ratio: g = c / f = 49/14 = 3.5 In other words, pedaling a week, flywheel three and a half weeks. Transmission ratio (transmission coefficient): Gear ratio multiplied by the diameter after the ring, is the transmission ratio. D represents the gear ratio, b represents the diameter of the back circle, the relationship between them with the formula that: d = c / f × b = gb It can be seen, the gear ratio is determined, the transmission ratio is proportional to the diameter of the back ring.

For example: 49 teeth, flywheel is 14 teeth, the back ring diameter of 27 (usually used in English), generation formula can be obtained transmission ratio: D = C / F × b = 49/14 × 27 = 3.5 x 27 = 94.5 Transmission stroke, each pedaling a week, the car forward movement distance is the transmission, travel, also known as the speed ratio of travel. It is calculated by multiplying the gear ratio by the pi. Where M is the transmission stroke, π is the ratio of the circumference (this is a constant, π = 3.14), and the relationship between them is expressed by the formula. That is, M = D? = C / F? B? Bicycle rear wheel diameter measurement commonly used in English, while the trip is generally used to calculate the metric system, so in the calculation need to convert the British metric system. One hour = 2.54CM, with K to represent, namely: K = 2.54CM. Into the formula, namely: M = G / F × B × π × k For example, the car is 49 teeth angle work machine, the flywheel is 14 teeth, the true diameter of the rear wheel when the bishop of Huang cnc bending machine, seeking it distance, find it distance, generation formula: M = C / F × b × π × k = 49 / 14 x 27 x 3.14 x 2.54 = 754 cm The above data is bike pedaling a week, the car forward for 745cm, or 7.54m.