Bevel gear is also available for us to produce. Usually our bevel gear is including straight bevel gear and spiral bevel gear. They both can be made with Gleason type and Klingelnberg type.
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Bevel gears are gears where the axes of the two shafts intersect and the tooth-bearing faces of the gears themselves are conically shaped. Bevel gears are most often mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well. The pitch surface of bevel gears is a cone.
Our main bevel gear type is including straight bevel gear and spiral bevel gear. They both can be produced with Gleason type and Klingelnberg type.
Straight bevel gears have conical pitch surface and teeth are straight and tapering towards apex.
Spiral bevel gears have curved teeth at an angle allowing tooth contact to be gradual and smooth.
1. Pitch Diameter (D)
The pitch diameter is the diameter of the pitch circle, where the teeth of two meshing gears come into contact.
For bevel gears, the pitch diameter is often referred to as the base diameter, and it is determined based on the gear ratio and the number of teeth.
The formula for the pitch diameter for a bevel gear is:
D=N/diametral pitch (P)
Where N is the number of teeth, and P is the diametral pitch (which is the number of teeth per unit of diameter).
Number of Teeth (N)
The number of teeth is one of the key defining factors in bevel gear design.
The number of teeth on each gear is usually designed based on the desired gear ratio. Bevel gears typically have a higher tooth count on the driven (larger) gear.
3. Pressure Angle (α)
The pressure angle is the angle between the line of action (the line connecting the contact points of the teeth) and the tangent to the pitch circle.
Common pressure angles for bevel gears are 14.5°, 20°, or 25°.
A larger pressure angle increases the strength of the teeth but also increases the axial forces and friction.
4. Pitch Cone Angle (θ)
The pitch cone angle is the angle between the axis of the gear and the line connecting the apex of the cone (the point where the axes of the two gears would intersect if extended) to the pitch circle.
For straight bevel gears, this angle is equal to the angle between the axes of the two shafts. For spiral bevel gears, the pitch cone angle can be varied for better meshing.
5. Backlash
Backlash is the small gap between the teeth of the two meshing gears. It is necessary to ensure that the gears do not bind due to manufacturing tolerances and thermal expansion.
Typically, the backlash for bevel gears is around 0.1–0.3 mm depending on the size of the gears and the application.
6. Face Width (b)
The face width is the width of the gear teeth along the axis of rotation. For bevel gears, this is measured along the width of the tooth from the root to the tip.
The face width typically ranges from 1/2 to 1 times the pitch diameter for most bevel gears. A larger face width can increase the strength and load-carrying capacity of the gear.
7. Root and Tip Diameter
The root diameter is the diameter of the base of the tooth, and the tip diameter is the diameter at the top of the tooth.
These diameters determine the tooth's height and geometry. The addendum is the height of the tooth above the pitch circle, and the dedendum is the depth of the tooth below the pitch circle.
8. Tooth Thickness (s)
The tooth thickness is the width of the tooth at the pitch circle, which is critical in ensuring proper meshing.
The standard tooth thickness is based on the module or diametral pitch. For bevel gears, it is adjusted to match the specific gear ratio and geometry.
9. Transverse Contact Ratio (εt)
The contact ratio refers to the number of teeth in contact at any given time. For bevel gears, a typical contact ratio is 1.2 to 1.5, but the specific value depends on the tooth design, especially for spiral bevel gears.
10. Axial Distance (L)
The axial distance is the distance between the axes of the two gears, which can be important for ensuring proper alignment and meshing of the teeth.
For spiral bevel gears, the axial distance is a key factor in determining the correct offset between the gear shafts.
11. Spiral Angle (β)
For spiral bevel gears, the spiral angle (often referred to as the helix angle) is the angle of the teeth relative to the axis of the gear.
Spiral bevel gears have teeth that are curved in the direction of rotation, which leads to smoother engagement and higher efficiency compared to straight bevel gears.
The spiral angle is typically between 15° and 35°, depending on the design.
12. Gear Ratio (i)
The gear ratio is the ratio of the number of teeth on the driven bevel gear to the driving bevel gear. For bevel gears, the ratio is typically less than 4:1 but can be higher in some cases.
The gear ratio influences the size of the gears and the dimensions of the teeth.
13. Material Selection
Bevel gears are often made from steel, stainless steel, or cast iron for strength and durability.
The material choice is based on factors like the operating conditions, load, speed, and environmental considerations.
Shape and Structure:
Bevel gears have a conical surface as the base, and their teeth are cut along the cone's surface.
The apex of the cone lies at the intersection of the shafts.
Applications for Angular Transmission:
Bevel gears are used when power needs to be transmitted between shafts that intersect, making them ideal for changing the direction of rotation.
Types of Bevel Gears
Straight Bevel Gears
Have straight teeth cut along the cone's surface.
Simple design but can produce more noise at higher speeds due to abrupt engagement.
Spiral Bevel Gears
Teeth are curved and oriented diagonally, providing smoother and quieter operation.
Handle higher speeds and loads better than straight bevel gears.
Zerol Bevel Gears
A special type of spiral bevel gear with zero curvature.
Combines some benefits of straight and spiral bevel gears.
Hypoid Gears
Similar to spiral bevel gears but with shafts that do not intersect.
Often found in car differentials due to their compact and strong design.
Material
Commonly made from materials such as steel, cast iron, or brass, depending on the application.
Heat-treated or hardened steel is often used for high-strength applications.
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