What are the main characteristics of drum gear couplings?

Published: 2020-11-16

Drum gear couplings are usually lubricated with lubricating oil. The tooth surface requires continuous lubrication. The lubricating oil should be drained smoothly, otherwise the temperature of the tooth surface will rise and accumulate moisture and dirt. The lubricating oil needs to be filtered by a high-precision oil filter. The filtration degree is less than 10 microns. Some important high-speed drum gear couplings can also adopt the structure of the oil collecting groove hole, that is, the oil collecting groove is machined in the external gear shaft hole, and the oil collecting groove is drilled at the bottom of the external gear tooth groove to communicate with the oil collecting groove. The oil hole of the drum-shaped gear coupling uses the centrifugal force generated by the high-speed operation of the drum gear coupling to spray oil into the meshing part of the inner and outer gears to make it fully lubricated.

improveDrum type gear couplingAn important way of service life.The tooth width coefficient affects the tooth root bending strength and tooth surface contact strength of the tooth. The larger the tooth width coefficient, the greater the strength of these two items. The tooth width coefficient affects the coincidence degree. When the tooth width coefficient is less than a certain value, its value The increase of φ has a greater impact on the increase of the coincidence degree, and when it is greater than this certain value, the increase of the device value has a smaller impact on the increase of the coincidence degree. For the drum-shaped gear coupling with a circular bulge curve, the tooth width is still Determine the parameters of the bulge circle radius and the backlash. The larger the tooth width, the larger the bulge circle radius and the larger the backlash required. Therefore, the following two requirements are required: Drum teeth for drum gear couplings The surface improves the contact conditions of the inner and outer teeth, avoids the disadvantages of edge extrusion and stress concentration of the straight tooth under the condition of angular displacement, and improves the friction and wear of the tooth surface, reduces the noise, and has a long maintenance cycle. .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 very convenient.

Drum-shaped gear couplings have a wide range of applications. Proper lubrication is very important for their extended life. Today, what are the main features of drum-shaped gear couplings?

1. Strong carrying capacity: When the outer diameter of the inner gear sleeve is the same and the outer diameter of the coupling is larger, the carrying capacity of the drum gear coupling is on average 15-20% higher than that of the spur gear coupling.

2. Large angular displacement compensation: when the radial displacement is equal to zero, the allowable angular displacement of the straight tooth coupling is 1-ordm; the allowable angular displacement of the drum-tooth coupling is 1-ordm; 30", an increase of 50%. In the same mold The allowable angular displacement of the drum gear is greater than that of the spur gear under the condition of the number of teeth, the number of teeth and the width of the teeth.

3. The drum-shaped tooth surface makes the contact conditions of the inner and outer teeth avoid the shortcomings of straight tooth edge extrusion and stress concentration under angular displacement conditions.At the same time, the friction and wear conditions of the tooth surface are reduced, the noise is reduced, and the maintenance cycle is long.

4. The tooth end of the outer gear sleeve is flared, which is convenient for the disassembly and assembly of the inner and outer teeth.

5. Fast transmission speed: Based on the characteristics of economy, drum gears have been widely used to replace straight gear couplings at home and abroad. The drum gear coupling produced by UMA has complete specifications and meets the corresponding standards.Drum gear couplings have the characteristics of rigidity, flexibility and inelasticity, and are not suitable for machinery that requires vibration damping, cushioning and biaxial alignment.

There are many types of couplings, and plum blossom couplings are more and more widely used. What are the tips for installing plum blossom couplings? Let’s take a look.

1. Before installation, first check whether the prime mover and the working machine are concentric, whether there are wrapping paper and scratches on the surface of the two shafts, whether there are debris in the inner holes of the two half couplings of the plum coupling, and the inner holes. Whether the edges are bruised, if any, the shafts and half couplings should be cleaned up, and the bruises should be treated with a fine file.Then check whether the inner hole diameter and length of the two half couplings are consistent with the diameter and shaft elongation of the prime mover and working machine.Generally, when selecting the type, it is better to make the length of the prime mover and the end half coupling of the working machine less than the extension of the shaft by 10-30mm.

2. In order to facilitate the installation, the two half couplings can be placed in a 120-150 incubator or oil tank for preheating, so that the size of the inner hole is enlarged and it is easy to install.After the installation, ensure that the shaft head cannot protrude from the end face of the half coupling, and it is better to be flush.Check the interval between the two coupling halves: take the average of the readings of 3--4 points measured along the two inner sides of the flange of the half coupling, and the sum of the measured dimensions of the extended section and the two diaphragm groups, two The error is controlled within the scale of 0-0.4mm.

3.找正：用百分表查看两半联轴节法兰盘端面和外圆跳动，当法兰盘外圆小于250mm时跳动值应不大于0.05mm；当法兰盘外圆大于250mm时，跳动值应不大于0.08。

4. Device bolt: Insert the bolt from the outside of the small hole in the flange, pass through the outside of the large hole of the other flange, put on the buffer sleeve, elastic washer, twist the nut, and tighten the nut with a wrench.If the device is unsuitable or removed and replaced, without damaging the shaft and the half coupling, it is better to roll freely after the device is over.

5. Instructions for operators: Before starting the equipment, check whether the nut of the torx coupling is loose or falling, and if necessary, tighten the nut with a wrench in time.