Oldham coupling

   Introduction to Cross Slider Coupling:
   The Oldham slider coupling is also known as the metal slider coupling. The slider has a circular ring shape and is made of steel or wear-resistant alloy. It is suitable for transmissions with low speed and large transmission torque.
   The Oldham coupling is composed of two half couplings with grooves on the end faces and an intermediate disc with protruding teeth on both sides.
   Because the convex teeth can slide in the groove, the relative displacement between the two shafts during installation and operation can be compensated.
   The material of the coupling parts can be 45 steel, and the working surface needs to be heat treated to increase its hardness; Q275 steel can also be used when the requirements are lower, without heat treatment.
   In order to reduce friction and wear, oil should be injected from the oil hole of the middle plate for lubrication during use.Because the half-coupling and the intermediate disc form a moving pair and cannot rotate relative to each other, the angular velocity of the driving shaft and the driven shaft should be equal.However, when working with relative displacement between the two shafts, the middle disk will generate a large centrifugal force, which will increase the dynamic load and wear.Therefore, it should be noted that the working speed should not be greater than the specified value when selecting.
    This kind of coupling is generally used for speed n<250r/min, the rigidity of the shaft is relatively large, and there is no severe impact.

    Advantages of special coupling for cross slide:
    It is composed of two half couplings with grooves on the end faces and a middle disc with convex teeth on both sides.Because the convex teeth can slide in the groove, the relative displacement between the two shafts during installation and operation can be compensated.
    The material of this coupling part can be 45 steel, and the working surface needs to be heat treated to increase its hardness. The flange coupling is a rigid coupling, which uses ordinary flat keys to separate two flanged half couplings. Connect with the two shafts, and then use bolts to connect the two half couplings into one body to transmit movement and torque.

    There are two main structural forms of the Oldham coupling:
    ①The reaming hole uses bolts to realize the two-axis centering and the bolt rod to bear the extrusion and shear to transmit the torque.
    ②It is centered by matching the convex shoulder on one half coupling with the groove on the other half coupling.
    The bolts connecting the two half-couplings can be ordinary bolts of grade A and B, and the torque is transmitted by the frictional moment of the joint surface of the two half-couplings.

    The material of the Oldham coupling parts can be 45 steel, and the working surface needs to be heat treated to improve its hardness;
    Q275 steel can also be used when the requirements are lower, without heat treatment.In order to reduce friction and wear, oil should be injected from the oil hole of the middle plate for lubrication during use.
    Because the half-coupling and the intermediate disc form a moving pair and cannot rotate relative to each other, the angular velocity of the driving shaft and the driven shaft should be equal.
    However, when working with relative displacement between the two shafts, the middle disk will generate a large centrifugal force, which will increase the dynamic load and wear.
    Therefore, it should be noted that the working speed should not be greater than the specified value when selecting.This kind of coupling is generally used at a rotation speed n<250r/min, where the shaft stiffness is relatively large and there is no severe impact.Steel has good wear resistance, that is, the ability to resist wear.
    The steel rigid coupling can maintain its shape and size under the condition of considerable pressure and friction.
    Due to the different working conditions of various couplings, steel couplings also have some other properties, such as high temperature mechanical properties, thermal fatigue properties, thermal conductivity and corrosion resistance.

    十字滑块联轴器两轴径向相对位移不大于0.01d+0.25㎜(d为轴径),许用相对角位移为30ˊ,端面间隙S,当外径不大于190毫米时，应为O．5～O．8毫米；
    When it is larger than 190 mm, it should be 1 to 1 mm.

    The material of the flange coupling can be gray cast iron or carbon steel. The advantages of using cast steel or forged steel under heavy load or when the peripheral speed is greater than 30 m/s:

    However, due to the simple structure, low cost, and large torque transmission, it is often used when the speed is low, there is no impact, the shaft is rigid, and the neutrality is good.　　
    Flange coupling (also known as flange coupling) is to use bolts to connect two flange (flange) disc type half couplings. The two half couplings are respectively connected with two shafts by keys to realize two shafts. Connect, transmit torque and movement.
    The flange coupling is simple in structure, convenient to manufacture, low in cost, reliable in operation, easy in assembly and disassembly and maintenance, and has a large transmission torque, which can ensure high centering accuracy of the two shafts. It is generally used for stable load. High-speed or high-precision shafting transmission.
   The flange coupling does not have radial, axial and angular compensation performance. If the centering accuracy of the two shafts cannot be guaranteed during use, it will reduce the service life, transmission accuracy and transmission efficiency of the coupling, and cause vibration And noise.

   The bolts on the flange can all be bolts for reaming holes, or half of them can be bolts for reaming holes, and the other half can be ordinary bolts.