Maintenance method of drum gear coupling

Drum-shaped gear coupling is an accessory used to connect mechanical equipment. It has a wide range of uses. What is the improvement plan for drum-shaped gear coupling? The following is the content brought about by the editor, and I hope Let us have a harvest!

Improvement Plan of Drum Gear Coupling

The basic parameters and dimensions of the elastic pin gear coupling are mainly for the diameter of the shaft hole ≧ 12mm and regular.However, there is no detailed reference on the basic parameters and primary dimensions of the coupling with the shaft hole diameter ≦ 12mm.In practice, couplings with a shaft hole diameter of less than 12mm are sometimes used, which requires us to plan for non-standard couplings.A small elastic pin gear coupling is used between the motor and the output shaft. The original structure sometimes forms the load transfer time effect of the motor. We analyzed the detailed reasons and made a half-coupling structure for the motor coupling failure. Plan from scratch.

1 The structure and principle before the improvement The connection between the motor and the coupling before the improvement is: the cooperation part of the motor and the half coupling 4 is 6mm, the length is 32mm, there is no keyway on the shaft, and the torque transmission of the key connection cannot be completed. According to the motor The installation requirements of the motor and the half-coupling hole selection transition cooperation, the torque is mainly transmitted by the two M5 set screws fixed on the half-coupling. During use, this structure has the following deficiencies: (1 ) There is a line surface touch between the motor shaft and the set screw, the touch surface is very small, and the transmission torque is very limited. (2) The threaded connection does not have the function of preventing loosening. After several times of disassembly and long-term operation, the relative rolling and axial movement of the half coupling shaft and the motor shaft will be formed, making the equipment unable to operate.

2 Improved structure and operating principle In view of the above situation, we have improved the structure of the half coupling. First, the half coupling 4 is processed into a product, and then the position of the machine tool along the center of the shaft diameter is cut with a line. Divided into two parts, the main part is the half coupling body and the attachment is the locking block. After the improvement, the main part of the half coupling is far away from the motor end, and the inner hole is intact, ensuring the coaxiality requirements of the motor shaft, motor shaft, main body and lock The tightening block is connected by the hexagon socket screw and the spring washer. Because the locking block half coupling is cut after processing the product, it will not affect the coaxiality requirements of the main body of the half coupling and the motor after assembling.With this structure, the original line and surface touch in the torque transmission part becomes the surface and surface touch, and the length of the touch along the axial direction increases, which in turn increases the touch area of ​​the motor and the coupling, and can also transmit large When the torque is applied, the spring washer between the hexagon socket screw and the locking block has an anti-loosening effect. When the coupling rotates at a high speed, the hexagon socket screw will not loosen.The coupling with this structure can be used to verify the torque transmission well. In other small coupling structures, this structure can also achieve many good effects.

Maintenance method of drum gear coupling

Outstanding smoothness ensures the reliable operation of the drum gear coupling and also reduces wear.

The drum gear coupling is composed of an internal gear ring with the same number of teeth and a flange half coupling with external gears.The external teeth are divided into straight teeth and drum teeth. The so-called drum teeth means that the external teeth are made into a spherical surface. The center of the spherical surface is on the gear axis. The tooth side clearance is larger than that of ordinary gears. Drum-shaped gear couplings It can allow larger angular displacement (relative to the straight tooth coupling), can improve the touch condition of the tooth, improve the ability of transmitting torque, and extend the service life.Touch along the width of the tooth when there is angular displacement.

Outstanding smoothness ensures the reliable operation of the drum gear coupling and also reduces wear.

Under the condition that the tooth root bending strength and tooth surface touch strength are satisfied, the tooth width should be determined with a larger degree of coincidence, and the tooth width should not be added blindly to avoid the increase of structural dimensions.The general tooth width factor is 8-14.The small tooth width should be determined by the agreed tooth root stress, and the width required for the displacement of the force point along the tooth width caused by the inclination angle between the shafts should also be considered.

An important way to improve the service life of drum gear couplings.The tooth width coefficient affects the tooth root bending strength and the tooth surface touch strength of the tooth. The larger the tooth width coefficient, the greater the strength of these two items. The tooth width coefficient affects the degree of coincidence. 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 effect on the increase of the coincidence degree. Regarding the drum-shaped gear coupling of the arc drum curve, the tooth width is still It is a parameter to determine the bulge circle radius and backlash. The larger the tooth width, the larger the bulge circle radius and the larger the backlash required. Therefore, the following highlights are required:

The smaller the gear tooth's collective load is, 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 teeth, 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. The lack of thinning may cause interference, and the excessive thinning will weaken the strength of the tooth, and the backlash will be very large. Big.

The drum-shaped tooth surface of the drum-shaped gear coupling improves the touch conditions of the inner and outer teeth, avoiding the disadvantages of kneading the edge of the straight tooth and the stress concentration under the condition of angular displacement, and simultaneously improving the tooth surface. Conflict, wear and tear, reduce noise, and long repair 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.

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