![]() When the gears’ two shafts are not parallel or intersect (offset shafts).When the gears’ two shafts intersect each other (intersecting shafts).Generally they have a high transmission efficiency. Spur gear, rack, internal gear and helical gear, etc. When the gears’ two shafts are parallel (parallel shafts).Classification of types of gears from the point of positional relations of the attached shafts Aside from a sprocket, an item that looks somewhat like a gear is a ratchet, but its motiion is limited to one direction. Simply said, a gear meshes with another gear while a sprocket meshes with a chain and is not a gear. The difference between a gear and a sprocket Others / Involute Spline Shaft and Bushing, Gear Coupling, Pawl and Ratchet.Nonparallel, Nonintersecting Axes / Screw Gear, Worm, Worm Gear (Worm Wheel).Intersecting Axes / Miter Gear, Straight Bevel Gear, Spiral Bevel Gear.Parallel Axes / Spur Gear, Helical Gear, Gear Rack, Internal Gear.There are three major categories of gears in accordance with the orientation of their axes (Important Gear Terminology and Gear Nomenclature in this picture) The history of gears is old and the use of gears already appears in ancient Greece in B.C. Also, they can be classified by shaft positions as parallel shaft gears, intersecting shaft gears, and non-parallel and non-intersecting shaft gears. Gears can be classified by shape as involute, cycloidal and trochoidal gears. By meshing a pair of these elements, they are used to transmit rotations and forces from the driving shaft to the driven shaft. But in addition to these, there are other types such as face gear, herringbone gear (double helical gear), crown gear, hypoid gear, etc.Ī gear is a kind of machine element in which teeth are cut around cylindrical or cone shaped surfaces with equal spacing. It is best to start with the general knowledge of the types of gears as shown below. If it is difficult to view PDF, please consult these sections. has its own additional explanation regarding the respective gear type. In addition to the list below, each section such as worm gear, rack and pinion, bevel gear, etc. Even after choosing the general type, it is important to consider factors such as: dimensions (module, number of teeth, helix angle, face width, etc.), standard of precision grade (ISO, AGMA, DIN), need for teeth grinding and/or heat treating, allowable torque and efficiency, etc.īesides this page, we present more thorough gear technical information under Gear Knowledge (separate PDF page). It is necessary to accurately understand the differences among gear types to accomplish necessary force transmission in mechanical designs. These can be broadly classified by looking at the positions of axes such as parallel shafts, intersecting shafts and non-intersecting shafts. In our practice packs you will find everything you need in order to score high in your test: a large pool of questions in different levels of difficulty, answers with profound explanations, detailed information, formulas, and tips and advice.There are many types of gears such as spur gears, helical gears, bevel gears, worm gears, gear rack, etc. JobTestPrep provides varied practice packs with a complementary study guide, developed exclusively for the test you need to take. Mechanical aptitude tests require preparation and familiarity with certain topics. Our study guide can provide you with all the tools you need in order to solve these questions. Also, in some questions, cogwheels may be meshed with different toothed components, such as internal cogwheels or rack and pinion in others, you may be required to calculate velocities. This question’s level is easy, and more difficult questions may include a complex system with a larger number of wheels. Think you know the answer? add it as a comment below! In which direction would cogwheel 3 turn? Usually, you will be required to distinguish the direction and / or velocity of the portrayed cogwheels.įor example: In the following illustration, cogwheel 1 is turning in a counterclockwise direction. When one cogwheel is turning in a certain direction, the other cogwheel meshed with it will turn in the opposite direction. the circular movement of force) to an additional cogwheel. The cogwheel is designed to transfer the circular torque (i.e. What are Gears, Precisely?Ī gear, or a cogwheel, is a wheel on which circumference there are equally sized and spaced teeth. Without proper preparation, this topic may seem confusing however, with our study guide, you can easily gain all the knowledge required for your test. The topic of gears is very prevalent in mechanical aptitude tests. Familiarity with Gears is Important for Your Score
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |