Why are bevel gears so expensive?

The choice between Worm gear units and bevel gear units has a major influence on efficiency and operating costs. In this article we would like to give you the most important advantages of worm and bevel gear units so that you can determine which one is the most suitable for your application. If you still have any questions, please do not hesitate to contact us: Contact form

Goto Kexin to know more.

Further information on worm and bevel gear units.

Frequent applications of angular gearboxes

Worm and bevel gears are often used to transmit motion at right angles or when other properties are required.

• Conveyor belts
• Crane
• Elevators
• Mixer
• Beverage industry
• Many other applications

Worm gear

Worm gears. Image source: © roostler ' Fotolia. com

A worm gear unit consists of two parts: a worm shaft with worm gears and a worm wheel. The two components are often made of two different materials (steel worm shaft and bronze worm wheel). Worm gears transmit the movement force at right angles via a sliding effect instead of a rolling movement.

Advantages

• Worm gears are mainly used when a large gear ratio is required. With a worm gear unit, a large overall ratio can be achieved with only a few stages. This means that a smaller, less expensive gearbox can be used.
• The highest ratio of a worm gear unit is about 100:1.
• High self-locking due to the sliding effect of the worm shaft makes an additional brake either obsolete or it is only necessary to install a small, less expensive brake. However, this property depends on the angle of inclination and the friction angle.
• More favourable than bevel gear
• Hollow shaft possible

Schematic diagram of a worm gear unit

Disadvantages

• The sliding contact of the gears causes strong friction, which results:
  • one High operating temperature
  • one Low efficiency
• High wear on the worm wheel, which is mostly made of bronze. (Only through bronze production a relative efficiency is possible. The friction would be much higher with steel on steel.)

Bevel gears

4 types of bevel gears

• Spiral
• Straight
• Cerol
• Skew Tooth

Bevel gear sets are composed of two parts, the bevel pinion and bevel gear, which transmit movements at right angles.

Bevel gears use angular gear teeth. As the gears rotate, the entire tooth width of the interlocking teeth is used to transmit the force. In addition, several teeth interlock at the same time. This results in the following advantages.

Advantages

• Quiet Operating noise (Quiet operation is particularly advantageous in environments such as theatres or airports.)
• Increased torque capacity compared to worm gears of the same size.
• High efficiency (rolling of bevel gears is very efficient compared to the sliding effect of worm gears (98.5%). The metal bevel gear teeth never come into direct contact with an oil film.)
• Hollow shaft possible

Bevel gearbox with 1:1 ratio. Image source: © roostler ' Fotolia.com

Disadvantages

• High costs.
• Bevel gears are manufactured in pairs. For maintenance and repair, both gears must be replaced.
• In order to achieve high efficiency, bevel gear sets must be positioned exactly, so the shafts must be adjusted very precisely.
• Limited translation range. Maximum ratio of 6:1 per bevel gear set. Spur gear stages are necessary in order to achieve a higher overall gear ratio.
• Bevel gears are not recommended for high-speed reduction. At high speed, a bevel gear unit generates noise.

Further information

Do you have any questions?

Please contact us: Contact form

Rating

You liked this article? We are looking forward to your feedback or comments.

Comments

We are looking forward to your feedback, suggestions, criticism, wishes for topics (of course also via contact form).

Bevel gearboxes can be realized using bevel gears with straight, helical or spiral teeth. The axes of bevel gearboxes usually intersect at an angle of 90 degrees, whereby other angles are also basically possible. The direction of rotation of the drive shaft and the output shaft can be the same or opposing, depending on the installation situation of the bevel gears.

The simplest type of bevel gearbox has a bevel gear stage with straight or helical teeth. This type of gearing is cheaper to manufacture. However, since only small profile coverage can be realized with gearwheels with straight or helical teeth, this bevel gearbox runs quietly and has less transmittable torque than other bevel gear teeth. When bevel gearboxes are used in combination with planetary gearboxes, the bevel gear stage is usually realized with a ratio of 1:1 in order to maximize the transmittable torques.

Another version of bevel gearboxes results from the use of spiral gearing. Bevel gears with spiral teeth can be in the form of spiral bevel gears or hypoid bevel gears. Spiral bevel gears have a high degree of total coverage, but are already more expensive to manufacture than bevel gears with straight or helical teeth because of their design.

The company is the world’s best Spiral Bevel Gear for Trains supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

The advantage of spiral bevel gears  is that both the quietness and the transmittable torque can be increased. High speeds are also possible with this type of gear teeth. Bevel gearing generates high axial and radial loads during operation, which can only be absorbed at one side because of the intersecting axes. Particularly when it is used as a rapidly rotating drive stage in multi-stage gearboxes, special attention must be paid to the service life of the bearing. Also, unlike worm gearboxes, self-locking cannot be realized in bevel gearboxes. When a right angle gearbox is needed, bevel gearboxes can be used as a low-cost alternative to hypoid gearboxes.

The advantages of bevel gearboxes:

1.Ideal for limited installation space

2. Compact design

3.Can be combined with other types of gearbox

4.Fast speeds when spiral bevel gears are used

5.Lower cost

The disadvantages of bevel gearboxes:

1.Complex design

2.Lower efficiency level than planetary gearbox

3.Noisier

4.Lower torques in single-stage transmission ratio range

If you are looking for more details, kindly visit Medical Equipment Gears.