Common Hypoid Gear Helical Bevel Pinion Gear With 90 Degree Right
Angle Bias
Hypoid gears are a type of spiral bevel gears that have an offset
shaft and non-intersecting axes. They are commonly used in various
applications where high torque transmission and compact design are
required.
In the terms of reduction ratio: Common hypoid gears generally have
moderate reduction ratios, typically ranging from 3:1 to 10:1.
These gears are designed to provide a moderate decrease in speed
and a corresponding increase in torque.
In the terms of application focus: Common hypoid gears are commonly
used in various applications where a moderate reduction in speed
and an increase in torque are required. They are found in
automotive differentials, power tools, and other machinery that
require a balance between speed and torque.
Hypoid gears are a special case of spiral bevel gears. The special
feature is that the axes of the two wheels are perpendicular but do
not intersect, and there is a certain offset distance, which is
technically called offset.
The hypoid gear counter axis has an offset distance, which makes
the transmission design arrangement more flexible and also improves
the strength of the small wheel. The small wheel of the hypoid gear
pair has a larger helix angle, which enables a greater degree of
coincidence when meshing, and the transmission is smoother. During
the transmission process, there is relative sliding along the tooth
length direction and tooth height direction, which makes the
workpiece grinding process better after heat treatment. However,
since the relative sliding force is larger than that of bevel
gears, the possibility of early wear is also greater, so attention
should be paid to the selection of lubricating oil.
Among the curved tooth lines, arcs and long epicycloids are the
most widely used, and arcs are mostly used. Curved teeth are easy
to grind, can achieve high precision, and can be used for
high-speed transmission. The long epicycloidal teeth are contoured
teeth and are cut continuously without intermittent tooth division.
The difference between this gear and a spiral bevel gear is that
the pinion shaft of this gear deviates from the axis of the gear
shaft to a certain extent. For gear meshing, in addition to spiral
bevel rolling, tooth line direction sliding is also used.
Therefore, compared with spiral bevel gears, this gear can drive
more quietly and smoothly.
Characteristics of hypoid gears:
Changes in the angle of transmitted torque
Able to withstand greater loads
The transmission is more stable and the noise is low
Adjustable offset
Transmission advantages of hypoid gears:
The axis of the small wheel is offset, which increases the
helix angle of the small wheel, resulting in a significant increase
in the diameter of the small wheel, thus enhancing the strength and
rigidity of the small wheel; and achieving a larger transmission
ratio than spiral bevel gears under the same conditions.
There is relative sliding along the tooth length direction and
tooth height direction, so the tooth surface wears evenly. Heat
treatment also facilitates grinding, improves contact areas,
improves tooth surface finish and reduces noise.
The axis offset allows greater freedom in the arrangement of the
transmission in space.
The axis is offset and can be crossed, and both wheels can be
supported by stable straddles.
The small wheel helix angle is increased, the strength is
significantly improved, and it can adapt to a larger transmission
ratio. Single-stage transmission can take more than 10.
Good lubrication conditions and high transmission efficiency.
Disadvantages compared to other types of staggered shaft drives:
The calculation and design are far more complicated than other gear
pairs.
Compared with general orthogonal spiral spur gears, the calculation
of tooth adjustment is more complicated, and the matching of the
contact area is also difficult.
The lubrication conditions are high and special hypoid gear
lubricants are required.
| Product | Common Hypoid Gear |
| Transmission Efficiency | 30.0-90.0 |
| Module(M) | ≤4 |
| Teeth Accuracy Grade | ISO 6-7 Grade |
| Service | Customized |
