The Metal Slider Coupling

The Metal Slider Coupling

The material of the slider coupling parts can be 45 steel, and the working surface needs to be heat treated to improve its hardness. When the requirements are low, Q275 steel can also be used without heat treatment. In order to reduce friction and wear, oil should be injected from the oil hole of the intermediate disc for lubrication during use. Since the half-coupling and the intermediate disc form a moving pair, relative rotation cannot occur, so the angular velocity of the driving shaft and the driven shaft should be equal. However, when there is relative displacement between the two shafts, the intermediate disc will generate a large centrifugal force, thereby increasing the dynamic load and wear. Therefore, when selecting, it should be noted that its working speed should not be greater than the specified value. This kind of coupling is generally used for speed n<250r/min, the shaft has high rigidity, and there is no severe impact.

The sliding block and the shaft sleeve are matched with a slight pressure, which can make the coupling operate with zero clearance during the operation of the equipment. As the use time increases, the slider may lose its non-recoil function due to wear and tear, but the slider is not expensive, and it is easy to replace, and it can still play its original performance after replacement. Slider couplings are often used in common motors, and can also be used to connect servo motors in individual occasions. During use, the relative displacement is corrected by sliding the slider. Because it is the friction between the slider and the bushing that resists the relative displacement, the bearing load between them will not increase due to the increase of the relative displacement.

Unlike other couplings, the slider coupling does not have an elastic element that can work like a spring, so the bearing load will not increase due to the increase in the relative displacement between the shafts. In any case, compared with this series of couplings, the ability to choose sliders of different materials is the advantage of this coupling. According to the specific requirements of customers, a variety of raw material sliders can be selected to suit different applications. Generally speaking, one type of material is suitable for zero clearance, high torque rigidity and high torque, and the other type of material is suitable for low precision positioning without zero clearance, but has the function of absorbing vibration and reducing noise. The non-metallic slider also provides electrical insulation and can act as a mechanical fuse. When the sliding block of engineering plastic is damaged, the transmission function will be terminated, so as to protect the precious mechanical parts. This design is suitable for large parallel relative displacements. The split three-part design of the slider coupling limits its ability to compensate for axial misalignment, such as in push-pull applications. At the same time, because the slider is floating, the two-axis motion slider will not fall off.

The Difference Between Slider Coupling and Quincunx Elastic Coupling

The relative displacement of the two shafts of the quincunx elastic coupling is within the rated allowable range of the coupling. Install the two bushings onto the shaft with the tenoned sides facing each other. Use a wrench to fully tighten the screws on one side of the sleeve to the recommended seating torque. Insert the quincunx spacer into the fixed sleeve so that the claws can touch the bottom of the groove of the sleeve. Insert a bushing into the quincunx spacer so that the prongs can touch the bottom of the groove in the bushing. It will take some force to complete the insertion, which is normal. The distance between the two shaft sleeves makes the metal of the two shaft sleeves not directly contact. Tighten the screws fully to their seating torque to secure the bushings on the shafts.

The relative displacement of the two shafts of the slider coupling is within the rated allowable value of the coupling. Install the two bushings onto the shaft with the tenoned sides facing each other. Rotate the two shaft sleeves so that the driving tenon with tenon surface is at an angle of 90°, align the groove of the slider with one of the tenons, and insert the slider into the tenon by hand. Put the axial stop washer into the groove bottom of the slider. Tighten the screws according to the in-position torque to fix the two shaft sleeves on the shaft. Take out the gasket to make the gap between the two shaft sleeves and the slider respectively, so as to balance the axial relative displacement.