What is gear?
The gears are a type of mechanical element whose teeth are
cut around a cylindrical or conical surface with the same space. It is used for
the rotation and transmission of force from the drive shaft to the driven shaft
when coupling a pair of elements. The gears can be classified into spiral,
cycloid and trochoidal gears according to their shape. It can also be
classified as parallel shaft gear, transverse shaft gear and non-parallel and
non-transverse shaft gear depending on the position of the shaft.
Various Types Of Gears:- They are different types of gears such as
spur gears, helical gears, bevel gears, internal gears which are classified
depend on the positions of the axes, such as parallel axes, transverse axes and
non-transverse axes.
To achieve the required force transfer in the mechanical
design, it is necessary to understand exactly the differences between the types
of gears. It is important to take into account factors such as dimensions
(module, dimension, helix angle, face width, etc.), precision standards (ISO,
AGMA, DIN) and tooth sharpening requirements after choosing a common type.
Gear Rack:- The teeth of the same size, cut to the same
distance along a flat surface or straight bar, are called gear rack. The rack
is a cylindrical gear with an infinite pitch radius. Converts the rotary
movement into linear motion when coupled with a cylindrical pinion. Gear frames
can be roughly divided into straight tooth frames and spiral frames, but both
have straight lines. You can connect the end of the gear racks to the end of
the gear rack by machining the end of
the gear rack.
Helical Gear:- The helical gears are cylindrical gears that
are used with parallel shafts similar to the spur gears and have winding teeth.
They have a better teeth grip than spur
gears, have excellent low noise and can carry higher loads, which makes them
suitable for high speed applications. When helical gears are
used, thrust bearings must be used because they generate thrust in the axial
direction. The helical gears come with turns of the right and left hand that
require the gear of the opposite hand to engage.
Bevel gear:- The bevel gears have a conical shape and are
used to transmit forces between two intersecting axes at a point (intersection
axis). The bevel gear has a cone on its step surface and its saw teeth are cut
along the cone. Types of bevel gears include straight bevel gears, helical
bevel gears, spiral bevel gears, bevel gears, angular bevel gears, bevel gears,
null bevel gears and hypoidal gears.
Spiral Bevel Gear:- The
spiral bevel gear is a bevel gear with a serrated tooth. Due to the high
contact rate of the teeth, efficiency, strength, vibration and noise are
superior to straight bevel gears. On the other hand, they are more difficult to
produce. In addition, since the tooth is bent, the thrust is generated in the
axial direction. The zero conical gears with a turning angle of 0 in a helical
bevel gear are called null bevel gears.
Screw Gear:- The screw gears are a pair of hand gears with a
45 ° angle of rotation on parallel axes that do not intersect. Since the
contact of the tooth is a point, the load capacity is low and is not suitable
for a high power transmission. Since the force is transmitted by the sliding of
the tooth surface, it is necessary to pay attention to the lubrication when
using the screw gear. There is no limit to the number of tooth combinations.
Miter Gear:- The miter gear is a bevel gear with a speed
ratio of 1. It is used to change the direction of the power transmission
without changing the speed. Miter straight and spiral miter gear. When using
helical miter gears, the thrust bearings
generate a pulse in the axial direction and must be considered for use. In
addition to a common miter gear with a 90 ° shaft angle, a miter gear with a
different shaft angle is called an angle miter gear.
Worm Gear:- The screw
shape that is cut on the shaft is a worm, the mesh gear is a helical gear, and
the axes that do not intersect are called worm gears. The worm and worm wheels
are not limited to cylindrical shapes. There is a type of hourglass that can
increase the contact rate, but production becomes difficult. It is necessary to
reduce the friction due to the sliding contact of the gear surface. For this
reason, a hard material is generally used for the worm, and a soft material for
the worm wheel. The rotation is smooth and quiet even if the efficiency is low
due to the sliding contact. If the angle of advance of the worm is small, an
automatic block is created.
Internal Gear:- The internal gears are teeth cut into a
cylinder or cone and paired with external gears. The main uses of the internal
gears are the planetary gears and the shaft couplings
of the gear type. Due to in-volute interference, trochoid interference and
cutting problems, there is a limit on the number of teeth between the
difference between internal and external gears. When the two outer gears are
engaged, the directions of rotation of the mesh of the internal and external
gears are the same but opposite directions.
