The aligning principle of gear coupling and the application of universal coupling

The alignment principle of the gear coupling is to approximate the projection of the movable end face circle of the motor on the fixed end face as a perfect circle, because the distance from the center of the movable end to the fixed end face remains unchanged.If you want to achieve it at the same time, the axis of the movable end and the axis of the fixed end are on the same line, which is just an ideal alignment state.In actual alignment, set the allowable error first, and when the error generated during alignment is within the allowable error range, alignment ends.In many occasions, the lower detection point of the pump cannot be detected, and the alignment work cannot be performed.

When the coupling is aligned, it should be adjusted in the vertical direction.The thickness of the front and rear foot pads can be calculated from the three-point detection data to detect the offset of the two axes.The diameter of the outer edge of the movable end coupling plus the distance from the outer edge of the coupling to the center of the axial dial gauge rod hole; the distance from the end face of the movable end coupling to the center of the front foot bolt of the movable end; the front of the movable end, The distance between the center of the rear foot bolt.From the above data, the thickness of the front and rear foot pads can be known.If the motor is higher than the fixed end, shim should be reduced; if the motor is not higher than the fixed end, shim should be added.

The structure of the gear coupling is basically symmetrical, and the two outer gear sleeves can be press-fitted or hot-fitted to the shaft head through a key connection.The tooth surface of the outer gear sleeve is arc-shaped teeth along the length direction, which is processed by the template using the profiling method.

The teeth on the outer gear sleeve of the gear coupling are drum-shaped teeth viewed from the direction of the tooth tip, and the tooth thickness gradually decreases from the center to both sides.The teeth on the inner ring gear that mesh with it are linear teeth.Since the tooth tip and tooth surface of the external gear sleeve are arc-shaped, the entire coupling is double articulated and flexible, so that it can adapt to the large deflection angle between the two axes. Thin oil can be used. Lubrication or dry oil lubrication.

The gear coupling has a compact structure, small size, weight, volume and moment of inertia, all parts are round, and the unbalanced moment is also small.Common faults in the work of gear couplings are serious wear on the inner and outer tooth surfaces; the inner gear ring produces a large axial displacement and cannot even be meshed; the inner and outer teeth are broken; the counterpart bolt is broken.Insufficient or lack of oil in the coupling of lifting accessories, or improper use of grease, causes calcification of the grease, which prevents lubrication between the tooth surfaces.Poor lubrication will cause serious wear on the tooth surface. This situation can be avoided as long as the new grease is replaced and qualified grease oil is injected regularly to prevent oil leakage and sufficient oil.

The required connection form and specific installation dimensions at both ends of the universal coupling; whether there are special requirements such as mounting brackets; whether it is necessary to choose flange bushings.When necessary, provide detailed appearance and connection dimensions; after determining the specifications of the cardan shaft, which structure is to be selected.The universal coupling is a special spherical hinged four-bar mechanism, in which, except for the frame, the included angle between the two rotating secondary axes on each component is 90°.The common feature of universal joints is the large amount of angular compensation, and the angle between the two axes of universal joints of different structure types is different, generally ≤5°-45°.

The selection of universal coupling directly affects the normal operation of the main engine, so it is critical. However, since the correct selection of universal coupling is related to the prerequisites and various influencing factors, the specific issues and methods to be considered during the selection Not the same.Is there any restriction on the installation position of the universal coupling, what is the specific installation length, and whether it needs to be telescopic.When it is required to expand and contract, what is the outward elongation of the universal joint in the ultra-short state.For universal joints that do not require expansion or contraction, the compensation of axial dimensional errors should be considered, and the position for compensation in the system should be determined.

The universal coupling utilizes the characteristics of its mechanism to make the two shafts not on the same axis, and when there is an angle between the axes, it can realize the continuous rotation of the connected two shafts, and transmit torque and motion simultaneously.The universal coupling is characterized by its large angular compensation capability, compact structure and good transmission speed.In some metallurgical industries, cranes are needed. If the crane is used for too long, it will cause a significant increase in gear coupling failures.The universal coupling has good transmission speed and good performance. It can be used in high temperature, not high oil and corrosive working environment, and is suitable for various heavy machinery industries.

Universal couplings are widely used. In rear-drive cars, universal couplings are required to link the engine, clutch and transmission.Reduce vehicle vibration, reduce component damage and noise, and extend the service life of components.Universal couplings are commonly used components. Universal couplings can be seen in the metallurgical industry, petroleum industry, heavy construction machinery, automobile industry and precision machinery industry.