Helical gears or spur gears?
Gears
are a key component of mechanical motors and actuators. They increase the
output torque and control the direction or speed of rotation. CLR has extensive
experience in the manufacture of plastic and metal gears of various shapes and
sizes: spur gears, incandescent empty gears, planetary gears and helical gears;
Sprockets, bolts or other types of teeth. Among them, helical and spur gears
are generally the most widely used in many industrial applications? Would you
like to know more about the differences and characteristics? This article can
help.
Helical gear:
advantages and disadvantages.
Helical gears work smoother and quieter than spur gears.
This difference is due to the oblique way in which the teeth interact with
respect to the axis of rotation. These axes can be parallel or generally
intersect at 90 °. In the case of crossover, helical gears are applied together
with helical gears, but in this case two bevel gears can be used alternately.
When the two teeth move, contact is made gradually, starting
at one end of the teeth and continuing in contact with the gears, rotating
until they are in full contact. Typical helix angles are about 15 to 30
degrees. Thrust load, on the other hand, varies in direct proportion to the
size of the propeller angle tangent.
Finally, a closer look at the types available may highlight
the following:
·
Cross Shaft Worm Gear: The simplest within the
Worm Gear category. They act like a screw or wedge as a result of high slip
along the side of the tooth.
·
Parallel Shaft Helical Gears:
Consists of an infinite number of low thickness staggered spur gears. This will
angle each tooth along the side like a cylindrical helix. When in contact with
each other, the spiral angles must be the same, but the directions must be
opposite. As a result of the helix angle, there is an axial thrust in addition
to the load.
·
Double helix or "herringbone": a
combination of right and left helix. The axial thrust absorbed by the worm gear
bearings is a disadvantage.
Advantages of Helical
gear
·
Angle gears run more gradually, allowing
smoother, quieter gear operation compared to sprockets or tooth wheels.
·
Helical gears last longer and have more teeth in
contact, making them ideal for high load applications.
·
The load is always spread across multiple axes,
reducing wear.
·
It can transfer motion and forces between
parallel and perpendicular axes.
Disadvantages
·
One of the drawbacks of these gears is the
thrust that occurs along the gear axis, which must be accommodated by a
suitable thrust bearing. There is a higher level of sliding friction between
the teeth. This increases wear during operation and requires a lubrication
system.
·
The efficiency of the helical gear is low
because it generates axial thrust and heat due to the contact between the
teeth. The greater the energy loss, the less efficient it is.
·
Higher manufacturing cost than spur gears.
Spur gear: advantages
and disadvantages.
Spur
gears are the most common type of gear and are distinguished from other
gears because the gears are positioned along a parallel axis. They are used to
achieve large gear ratios, low and medium speeds. Spur gears are very useful
when you need to transfer motion from one axis to a close parallel axis.
Advantages of spur
gears
·
It can be used to transmit a significant amount
of power (up to about 50,000 kW).
·
They are very reliable.
·
This piece is the simplest piece to design and
manufacture. Job projects that contain spur gears can be implemented more
quickly.
·
They provide a constant and stable gear ratio.
·
Spur gears are more efficient compared to
helical gears of the same size.
·
No axial force is generated because the teeth
are parallel to the axis. Therefore, the gear shaft can be easily mounted by
ball bearings.
Disadvantages
· Low speed gear.
·
Power cannot be transferred between non-parallel
axes.
·
Spur gears make too much noise when running at
high speed.
·
The teeth of the wheel are under a great deal of
stress.
·
It cannot be used for long-distance power
transmission.
·
It is not elastic compared to other types of
gears.
For applications, it is common for applications where slow
motion is required and the noise level is not critical, such as in the vending
machine or security system industry. They also serve important applications by
transmitting motion within a planetary gear
motor.
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