The damage of drum gear coupling and the requirement of drum curve

Causes of damage to the drum gear coupling:

XNUMX. The main reason is that the vibration damper of the main engine has sunk, which makes the shafting of the coupling appear asymmetry, thereby increasing the additional torque, which makes the coupling heat up during use There was a fracture accident.

XNUMX. When using couplings, the equipment in the shafting system, such as diesel engines, gearboxes, shafting and couplings, must complement each other in design and use, and the level of design and manufacturing is relatively good. This design The quality of the ship coming out is also very high.

Drum-shaped gear coupling has the characteristics of high rigidity and flexibility. It is not suitable for equipment that requires vibration reduction and strict cushioning. Let's briefly understand its advantages.

15. Carrying.Under the same outer diameter of the inner gear sleeve and the outer diameter of the coupling, the carrying capacity of the drum gear coupling is on average 20-XNUMX% higher than that of the straight gear coupling.

XNUMX. The drum-shaped tooth surface enables the contact conditions of the inner and outer teeth to avoid the disadvantages of squeeze the edge of the straight tooth and stress concentration under the condition of angular displacement. At the same time, it reduces the friction and wear of the tooth surface, reduces noise, and maintains The cycle is long.

1. Large amount of angular displacement compensation.When the radial displacement is equal to zero, the allowable angular displacement of the spur gear coupling is 1º, and the allowable angular displacement of the drum gear coupling is 30º50, which is increased by XNUMX%. When wide, the angular displacement of the drum-shaped gear is larger than that of the straight tooth.

XNUMX. The tooth end of the outer gear sleeve is in the shape of a horn, which makes the assembly and disassembly of the inner and outer gears convenient.

When the drum gear coupling is working, the two shafts and the stainless steel coupling diaphragm produce relative angular displacement. The tooth surfaces of the inner and outer teeth periodically slide relative to each other in the axial direction, which will inevitably cause tooth surface wear and power consumption. Therefore, the teeth Type couplings need to work in a good and sealed state.Gear couplings have small radial dimensions and large load-bearing capacity. They are often used in shaft transmissions under low-speed and heavy-duty conditions. The dynamically balanced gear couplings can be used for transmissions, such as gas turbine shaft transmissions.Because the angular compensation of drum gear couplings is greater than that of straight gear couplings, drum gear couplings are commonly used. Straight gear couplings are obsolete products, and those who choose it should try not to use them.

The drum gear coupling is a rigid-flexible coupling. The gear coupling is composed of an internal gear ring with the same number of teeth and a flange half coupling with external teeth.The external teeth are divided into two types: straight teeth and drum teeth. The drum gear coupling allows large angular displacement (compared to the straight tooth coupling), which can change the contact conditions of the teeth and improve the ability to transmit torque. ,Extended service life.

Drum gear couplings are rigid-flexible couplings, with radial, axial and angular axis deviation compensation capabilities. Compared with CL type straight gear couplings, it has a compact structure, small turning radius, The advantages of large carrying capacity, low noise and long maintenance period.

What are the requirements of the drum gear coupling on the drum curve?

The drum-shaped tooth surface of the non-conjugated tooth surface is formed by stacking different end sections with gradual displacement. The dashed line formed by the displacement and the axial coordinate is called the drum curve. The drum curve is the drum-shaped gear coupling. An important geometric parameter.The bulge curve is mostly one arc, and there are also three arcs. These circles are called bulge circles. In the arc bulge curve, there are bulge circles whose center is on the axis of the gear, and others are not on the axis; There are those where the center of the bulge circle coincides with the center of the sphere of the tooth surface, and there are others that do not coincide. Usually, the design is based on experience. In general, the drum gear coupling should meet the following requirements:

XNUMX. There will be no edge contact when the inclination angle between the shafts is large;

XNUMX. The smaller the gear tooth's concentrated load, the better, and the curvature of the tooth surface is proportional to the circumference of the drum, so the drum radius is as large as possible.The curvature radius of the bulge curve is proportional to the single-sided thinning of the internal tooth, so the bulge circle radius should be as large as possible.The radius of curvature of the drum curve is proportional to the single-sided thinning of the internal tooth, that is, it is related to the meshing gap of the tooth. Insufficient thinning may cause interference, and excessive thinning will weaken the strength of the tooth, and the backlash will be large. .