Which types of tooth arrangement are used for bevel gears?
The teeth on bevel gears can be straight, spiral or “zerol”.
How do I figure out my tooth contact pattern?
Use gear marking compound to paint all of the ring gear teeth. Load the ring gear and run a full contact pattern check. Observe all gear teeth for proper contact pattern and a uniform pattern from tooth to tooth. The contact pattern on the drive side (convex) of the tooth is mostly towards the toe.
What is a bevel gear with straight teeth called?
The arrangement is called spur gearing. Spur gears have straight teeth and are parallel to the axis of the wheel.
When do you use bevel gears?
Bevel gears are used to connect shafts whose axes lie at an angle to each other, although in most applications the shafts are at right angles. The tooth profile is basically the same as used for spur gears except that the tooth gets progressively smaller as it approaches the apex of the projected cone.
How do I select a module of bevel gear?
To determine the value of module for a given gear, you measure the pitch length in millimeters and divide that value by π. For example, if the pitch length measured 9.425mm, this would be a module 3 gear. By incorporating π into the value of pitch, the metric dimensions of a spur gear are very simple to calculate.
How are bevel gears measured?
The diametral pitch of all bevel gears is conveniently measured at the outer or heel part of the tooth, while the pressure angle (and spiral angle of spiral bevels) is measured at mid-face on the tooth. The tooth dimensions are taken from the large end of the tooth.
What are the contact patterns of Novikov gear and duplex spiral bevel gear?
Instantaneous contact patterns on the concave surface of the pinion tooth for: (a) helical bevel Novikov gear and (b) duplex helical spiral bevel gear. For the conventional gear, the contact pattern clearly extends along the tooth line. In case of Novikov gear contact, the pattern extends along the tooth width but also along the tooth height.
What is the contact pattern in bevel and Hypoid gearings?
The discussion on contact pattern in bevel and hypoid gearings is briefly summarized as follows: The contact pattern cannot be measured similar to that (and with a corresponding accuracy) as other design parameters of a gear are measured, for example, as a bore diameter, a face width, a face angle, and so forth.
What is the best software for bevel gear design?
To support the design and manufacturing of such gears, leading bevel gear manufacturers such as Gleason or Klingelnberg have developed their own software (e.g. GEMS or KiMOS). The software features tooth contact analysis and geometry optimization modules permitting the user to obtain the correct contact pattern position (VHJ analysis) and strength.
What is a gear contact pattern?
Simply stated, the contact pattern is the area in which the gear teeth come in contact as they engage and disengage during their rotation. When a gear is installed in a gearbox and is powering the designated application, there are varying degrees of pressure, or load, on the gear teeth.