Curved Tooth Gear Couplings - Toothed Couplings

The curved-tooth gear coupling is a specially designed advanced gear type coupling. Its outer teeth are made into a sphere, with the center of the sphere on the axis of the gear. The teeth clearance is slightly larger than the general products and can transfer a greater torque and allow greater angular displacement, enjoying excellent performance and longer life.

China National Toothed Couplings

ROD crown gear coupling is one of the transmission products with core technology independently developed by Rokee and has established and reported corporate technical standards in the country. By combining with the standard coupling technology of advanced countries such as Japan and Germany, we optimized many detailed dimensions, and adopted the toothed design with a large pressure angle and short shaft design for the shaft hole, which reduces the length-diameter ratio, and has a more compact structure and excellent speed performance. The bolts of similar types are standardized and the parts are universal. Compared with the national standard couplings, our standard couplings can transfer more torque, with greatly reduced mass and small moment of inertia. Brake drum gear coupling meets the European explosion-proof requirements and the comprehensive performance is greatly advanced. We highly recommend you to choose our products for better transmission performance.

ROD Series Curved Tooth Couplings

Curved Tooth Gear Couplings,Toothed Couplings

Gear coupling is a common mechanical transmission component widely used in various industrial equipment and vehicles.

The gear coupling is mainly composed of internal gear rings, flange half couplings with external teeth (external gear shaft sleeves), end caps, and sealing devices. Among them, the external teeth are divided into two types: straight teeth and drum teeth. Generally, small-sized gear coupling end caps and inner gear rings can form a monolithic structure.

The toothed coupling utilizes the meshing of inner and outer teeth to achieve the transmission of torque and rotational motion between the two halves of the coupling. It is suitable for connecting the transmission shaft system of two concentric shafts and has a certain compensation performance for the relative displacement of the two shafts. During operation, the two shafts generate relative displacement, and the tooth surfaces of the inner and outer teeth periodically slide axially relative to each other, thereby transmitting torque.

Curved Tooth Gear Couplings can be divided into the following three forms based on the different axial tooth profiles of their outer gear shaft sleeves:
Straight tooth coupling: The axial tooth blank of the outer gear shaft sleeve can be processed into two types: straight line and circular arc, while the indexing circle and tooth root circle are both straight lines. The meshing form of this coupling is exactly the same as that of the involute cylindrical gear, which compensates for the relative displacement between the two shafts by increasing the backlash between the inner and outer teeth, but the compensation amount is limited.
Drum gear coupling: The tooth tips of the outer gear shaft sleeve are machined into circular arcs, that is, the tooth blank is machined into spherical surfaces. This special drum shaped design is a key feature that distinguishes it from other toothed couplings. Drum shaped gear couplings allow for greater angular displacement, improve tooth contact conditions, enhance torque transmission capabilities, and extend service life. Its characteristics also include high load-bearing capacity, reasonable structure, reliable performance, good compensation performance, smooth operation, and low noise.
Special drum toothed coupling: This is a variation of drum toothed coupling with specific application scenarios and requirements.

Gear couplings have small radial dimensions and high load-bearing capacity, and are commonly used for shaft transmission under low-speed and heavy-duty conditions, such as metallurgy, mining, lifting and transportation industries. High precision and dynamically balanced gear couplings can also be used for high-speed transmission, such as shaft transmission in gas turbines.

When installing a tooth coupling, the following points should be noted:
Check the meshing of the coupling teeth to ensure that the contact area is not less than 50% along the tooth height and not less than 70% along the tooth width, and that there is no severe pitting, wear, or cracks on the tooth surface.
The full circle runout and end face circle runout of the outer gear ring of the coupling need to be controlled within a certain range.
If it is necessary to remove the ring gear, special tools must be used to avoid damaging the shaft or ring gear.
When reinstalling the intermediate connecting tube or other components, they should be assembled according to the original markings and data.
Use a torque wrench to evenly tighten the bolts.

In terms of maintenance, toothed couplings need to work in a well lubricated and sealed state to extend their service life. At the same time, the wear of the coupling should be checked regularly, and severely worn components should be replaced in a timely manner.

In the market, there are many varieties of gear couplings, and prices vary depending on factors such as model, material, and brand. When purchasing, users should choose the appropriate model and specifications according to their own needs, and pay attention to the quality and after-sales service of the product.

Gear couplings play an important role in mechanical transmission systems due to their unique structure and excellent performance. When selecting and using, one should fully understand its type, characteristics, and application scenarios to ensure the stable operation and extended service life of the equipment.