What do you need to know about gear ratio?
The gear ratio is the ratio of the number of turns the output shaft makes when the input shaft turns once. In other words, the Gear ratio is the ratio between the number of teeth on two gears that are meshed together, or two sprockets connected with a common roller chain, or the circumferences of two pulleys connected with a drive belt.
How is the torque of the gears reduced?
Therefore, the torque (turning force) is reduced by as much as the energy is lost as above. The ratio of input to output forces of gears is called “machine efficiency” and its approximate value is known according to the gear type. (Table 3-2)
What is the relationship between two gear shafts?
Relationship of two shafts Gear name parallel shaft spur gear parallel shaft helical gear parallel shaft double helical gear parallel shaft internal gear
What happens when you use too low a gear on a bike?
Continuing with the car example, using too low a gear at high speed would result in high fuel consumption. The same is true of your body pedalling a bike. So, quite simply, more gears means more scope to find your preferred pedalling speed.
How are profile shifted helical gears calculated in normal system?
That is because meshing of the helical gears in the axial direction is just like spur gears and the calculation is similar. Table 6-1 shows the calculation of profile shifted helical gears in the normal system. If normal coefficients of profile shift xn1, xn2 are zero, they become standard gears.
What is the linear displacement of a helical gear?
In the axial system, the linear displacement of the helical rack, l, for one turn of the helical gear equals the integral multiple of radial pitch. These helical gears are also known as spiral gears. They are true helical gears and only differ in their application for interconnecting skew shafts, such as in Figure 7-1.
How is the thrust load related to the hand of the gear?
The direction of the thrust load is related to the hand of the gear and the direction of rotation. This is depicted in Figure 7-1. When the helix angle is larger than about 20°, the use of double helical gears with opposite hands ( Figure 7-3a) or herringbone gears () is worth considering.
When to use double helical gears with opposite hands?
WT = axial thrust load, and Wt = transmitted load. The direction of the thrust load is related to the hand of the gear and the direction of rotation. This is depicted in Figure 7-1. When the helix angle is larger than about 20°, the use of double helical gears with opposite hands ( Figure 7-3a) or herringbone gears () is worth considering.