Matters needing attention for maintenance of coupling types

Water pump coupling is mainly rigid coupling, tooth coupling and elastic coupling, are described as follows: Rigid coupling is generally used in small power centrifugal pump, repair first remove the connecting bolt and rubber elastic ring, the temperature is not high liquid, two half coupling plane gap is 2.2~4.2mm, when the temperature is higher, should be larger than the shaft cuting 1.55~2.05 mm. The rubber elastic ring of the coupling should be 0.15~ 0.35mm smaller than the diameter of the perforation. At the same time, special tools are needed to keep smooth and clean, and no scratches are allowed. Toothed coupling has good flexibility and automatic alignment performance.

There are hundreds of varieties of tooth coupling, but the basic form is two kinds: 1, inner tooth and outer tooth combination; 2. End teeth combination type. All other forms are variations on these two foundations. The internal and external teeth of the tooth clutch transmission torque is relatively large, the design takes into account the different needs of users, deliberately designed to be on both sides of the tooth shaft end length is not consistent, so that users can choose the installation direction according to the need. So, there's no rule about which end faces which way. When installing, pay attention to: 1, if it is the original equipment replacement, then generally should be consistent with the original direction, if it is the new design and manufacture of equipment, so to not interfere with other parts around the premise, according to the internal and external teeth combined surface more reliable principle installation.
1, check the coupling tooth surface meshing situation, the contact area along the tooth height is not less than 50%, along the tooth width is not less than 70%, tooth surface shall not have serious pitting, wear and crack. 2. The full-circle runout of the outer gear ring of the coupling is not more than 0.03mm, and the end-face runout is not more than 0.02mm. 3. If the gear ring must be removed, special tools must be used, not to knock, so as not to bend or damage the shaft. When reloading, the gear ring should be heated to about 200℃ and then installed on the shaft. Interference between outer ring and shaft is generally 0.01~0.03mm. 4. Assemble the indirect cylinder or other parts according to the original mark and data. 5. Tighten the bolts evenly with a torque wrench.

Wheel coupling is divided into convex and concave two categories, convex is divided into three types with a skeleton integral, boneless integral and radial notch. Wheel coupling is divided into convex and concave two categories, convex is divided into three types with a skeleton integral, boneless integral and radial notch. Their common feature is that the tire ring is bolted to connect the two halves of the coupling to achieve the connection of the two shafts. The inner side of the tire ring is bonded with the steel skeleton by vulcanization method, and the bolt holes on the skeleton are welded with nuts. Assembly bolts and two and a half coupling flange connection, rely on the screw down the bolt to make the friction between the tires and flange end face to transmit torque, tyre ring occur torsional shear deformation at work, so the tyre coupling of high elasticity, the compensation ability of two axes relative displacement is larger, and has a good damping, and simple structure, without lubrication, installation and maintenance are convenient. Its disadvantage is that the bearing capacity is not high, the size is large, with the increase of the relative torsion Angle of the two shafts make the tire shape twisted, the axial size is slightly reduced, will produce a larger additional axial force on the two shafts, so that the bearing load increases and reduces the life. When the tire coupling runs at high speed, the tire outer edge expands outward due to the centrifugal force, which will further increase the additional axial force. Therefore, when installing the coupling, measures should be taken to make the direction of stress in the tire and the direction of stress generated when working in the opposite direction, in order to offset part of the additional axial force, to improve the coupling and the conditions of the two bearings. `

Diaphragm type elastic coupling :1, cleaning and checking the surface of the two half coupling, there should be no crack, wear, and the interval sleeve with the surface should be smooth, no burr, the coaxiality deviation of the two half coupling should be less than 0.003mm. 2, clean and check the spring sheet, there should be no crack, deformation. 3, clean and check the bolt, its surface should not crack, wear, deformation. 4, alignment requirements: axial ±0.03mm, radial ±0.05mm.