The basic situation of the Worm Gear

   Worm gear shaft used to transmit motion between two staggered and motivation. Where between worm and worm gear and rack equivalent plane , the worm has a similar shape with the screw .
   Basic parameters
   Modulus m, pressure angle, worm diameter factor q, lead angle , worm head count, worm gear teeth , addendum coefficient ( take 1 ) and headspace coefficient ( , 0.2 ) . Wherein the modulus number m and the pressure angle is the angle of the worm shaft surface modulus and pressure angle, i.e. the end face of the worm wheel modulus and pressure angle, and are the standard values ​​; worm worm diameter coefficient (q) of the pitch circle diameter of its modulus the ratio of m.
   Properly engaged
    1.Intermediate plane of the worm and worm wheel modulus and the pressure angle are equal, that is the end surface of the worm gear worm modulus equal axial modulus and the standard value ; worm pressure angle of the end face of the worm shaft to be equal to the angle and is the standard surface pressure value, i.e.
== m, ==
   2.When the worm stagger angle too , the need to ensure , and worm and worm helix rotation must be the same .

Worm Gears Units

    Institutional characteristics
    You can get great gear ratio than the compact crossed helical gear mechanism
Two tooth surfaces in line contact , its carrying capacity is much higher than crossed helical gear mechanism
Equivalent helical worm gear drive for multi-tooth meshing , so the smooth transmission, noise is small
With self-locking . When the lead angle of the worm gear teeth meshing between the equivalent of less than the friction angle, with a self-locking mechanism , enabling reverse self-locking, which can only be driven by a worm worm , and not driven by a worm gear worm . Such as heavy machinery used in its self-locking worm gear , the reverse self-locking can play a security role
    Transmission efficiency is low, severe wear . Worm gear transmission , the meshing teeth relative sliding velocity between the large , so friction losses and low efficiency . On the other hand , the relative sliding velocity Ambassador severe tooth wear , severe fever , in order to reduce heat and wear, often using more expensive antifriction material with good abrasion resistance and good lubricating device , and thus higher costs , greater axial force worm

   Attention problems
    Worm lead angle on the worm helix indexing cylinder tangent angle between the end of the worm , and the relationship between the helix angle of the screw , worm spiral angle is large then the transmission efficiency is high, when engagement between the teeth is less than the equivalent friction angle , institutional self-locking.
Coefficient (q) into the worm diameter worm hob in order to limit the number , the pitch diameter of the worm is standardized m is constant , q large then large , the rigidity and strength of the worm shaft increases accordingly ; constant , q smaller the lead angle increases, the transmission efficiency is increased accordingly.
   Worm Head recommended value is 1,2,4,6 , when to take a small value, the transmission ratio, and has a self-locking ; when taking large value, high transmission efficiency .
   Cylindrical gear with different institutions worm worm gear ratio is not equal to the center distance institutions .
   The worm gear worm gear shift determination method , according to the direction of engagement at the point K , the direction ( parallel to the tangent of the helix ), and should be perpendicular to the axis of the worm wheel velocity vector Videos.

   Triangles to determine ; also available " right-handed worm left hand , right hand left worm , four fingers thumb " to determine.
   Application
   Worm and worm wheel is often used two axes staggered, transmission ratio, transmission power is small or intermittent occasions.
    Chinabase Machinery is a group of manufacturing facilities, offering one-stop solution for mechanical power transmissions products in China. We can supply a full-range of power transmission products, such as chains,Transmission Chain, sprockets and plate wheels,Agricultural Chain, pulleys, gearboxes, motors, couplings,Chain Coupling, gears and racks. Our product range also covers locking assemblies (clamping elements/locking device), Linear Bearing,taper bushes, QD bushes, bolt-on hubs, torque limiters, shaft collars, motor bases and motor slides, chain detachers, chain guides, universal joint, rod ends and yokes.