subject: Guide for Gear Selection [print this page] Guide for Gear Selection Guide for Gear Selection
Gears are very important mechanical parts, and they can be applied in many places. A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit torque. The gears in a transmission are analogous to the wheels in a pulley. An advantage of gears is that their teeth can prevent from slipping.
Although gears themselves are not so complicated, it is still very difficult for people to select the right and exact gears that matches their expectations, requirements and criteria. Except that people are quite familiar with the application of gears and their functions, selecting the satisfactory gears is a very hard task for most people. There are many factors which will affect people's choice of right gears. Highlighted here are some of the basic parameters that go a long way in selecting the right gear.
One point is that choosing gears should base on gear strength. This is a most vital step and consists of a thorough comprehension of the following points: the first point is the bending strength. The permissible bending strength of a gear is referred to the allowable tangential force of the pitch circle. The principle working behind it is the mutually allowable root stress of two gears meshing under load. The second point is the surface durability. It is actually the allowable tangential force of a pitch circle. It permits a safe force transmission of force without any occurrence of surface failures. The third one is the torque load. This can be performed with the help of the catalogues that is made available by the manufactures of different gears.
The other point is that the selection of gears should base on the gear application. It is a simple way to make a right choice. Of course, there are also many criteria people should follow. The first one is high speed rotation. In the case of high speed gear drives, many applications need noise and vibration reduction. In such situation, it will be very wise for people to choose the ground spur gears. The second one is the high reduction ratios. They can be obtained by forming of effective planetary gear systems by applying spur and internal gears. The third criterion is the compact design. The size of gear is generally proportional to the load capacity. For making the design compact alloys can be used with the help of heat treating. Addition to the above elements, there are still many other points. For instance, backlash considerations are also very important. In order to minimize the backlash, it is recommended to use high precision parts that have ability to adjust the center distances.
Since gears are necessary parts in the industries, the right choice of them becomes very important. The above content will be useful when you choose gears.
