|
|
|
 |
|
||||||||||||||||||||
| Spiral Bevel Gears are the most complex form of bevel gear. Used where high load and high speeds are encountered, since they can be hardened, ground, and produced quite accurately. The teeth are curved and oblique resulting in higher overall contact ratios than are possible with straight bevel gears. Because of this improved contact ration and the resultant load sharing, spiral bevels have better load-carrying capacity and run more smoothly and quietly than straight bevel gears. The improved load capacity of spiral bevels allows them to be smaller in size for a given load capacity than an equivalent straight bevel gear. |
| Spur Gear has teeth on the outside of a cylinder and the teeth are parallel to the axis of the cylinder. |
|
Helical gears have teeth cut on a spiral that wraps around a cylinder. The teeth are cut at an angle to their axes of rotation. Helical teeth enter the meshing zone progressively and, therefore, have a smoother action than spur gear teeth and tend to be quieter. The load transmitted may be somewhat larger, or the life of the gears may be greater for the same loading, than with an equivalent pair of spur gears. Helical gears can be used to transmit power between parallel shafts or intersecting shafts. Split double helical gears combine to form anti-backlash gears.
Internal Gears - Teeth on the inside of a cylinder. The teeth may be either spur or helical. The teeth of an involute form internal gear have a concave shape rather than a convex shape. Internal gears are generally more efficient since the sliding velocity along the profile is lower than for an equivalent external set. The tooth strength of an internal gear is greater than that of an equivalent external gear. Another advantage of an internal gear is that it operates at a closer center distance with its mating pinion than do external gears of the same size. This permits a more compact design. The internal gear eliminates the use of an idler gear when it is necessary to have two parallel shafts rotate in the same direction. The internal gear forms its own guard over the meshing gear teeth. This is highly desirable for preventing accidents in some kinds of machines. |
|
Worm Gearing -
The most basic form of worm is a straight cylindrical worm in mesh with a simple helical gear. These gears can provide considerable higher reduction ratios than simple crossed axis gear sets, but their load capacity is low, and the wear rate is high. For light loads, this configuration can be an economical alternative. Worm gearing also provides braking capacity against reverse movement.
Better load capacity can be achieved with the Single-Enveloping Worm Gearing. The worm fits down farther into the gear to achieve greater tooth contact area and thus smoother operation and improved load capacity. The Double-Enveloping Worm Gear allows the worm to envelop the wheel as well. By getting more teeth into contact, they tend to provide higher load capacity than do cylindrical or single-enveloping worm sets. This is accomplished by changing the shape of the worm from a cylinder to an hourglass. |
| Our experience has been that Anti-Backlash Gears provide for doubling of machine speeds and significant reduction in vibration and internal stresses throughout the machine. Anti-backlash gears reduce shockloads, resulting in quieter running, smoother power transmission and higher torque capabilities. Split double helical gears combine to form anti-backlash gears. |
| Geneva mechanisms are motion control devices. |
| We design and build Gear Boxes as required. |
| Anti-Backlash Gear - Gear Box - Geneva Mechanism - Helical Gear Worm Gearing - Spiral Bevel Gear - Spur Gear - Straight Bevel Gear - Top of Page |
| Home | Capabilities | Products | Services | Company Info | Contact | Top |
|
© 2004 Moore Machine & Gears Inc
All Rights Reserved. |