Worm Gear Jack

Worm gear mechanism is often used to transfer the motion and power between two staggered shafts. Worm gear and worm are equivalent to gear and rack in its middle plane, and worm is similar to screw in shape. The gear reduction ratio of worm gear is generally 20:1, sometimes even as high as 300:1 or more.

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Ever-Power Group Co., Ltd. specializes in the production of all kinds of mechanical transmission and hydraulic transmission: planetary gearbox, worm gear reducer, in-line spiral gear reducer, parallel shaft spiral gear reducer, spiral bevel gear reducer, spiral worm gear reducer, agricultural gearbox, tractor gearbox, automobile gearbox, power output shaft, special reducer and related gear parts and components Other related products, chain wheel, hydraulic system, vacuum pump, hydraulic coupling, rack and pinion, chain, timing pulley, UDL transmission, V-belt pulley, hydraulic cylinder, gear pump, screw air compressor, low backlash worm reducer, etc. In addition, we can customize transmission, gear motor, motor and other hydraulic products according to customers’ drawings.

Institutional Features

If you want to get a larger gear reduction ratio, you need to use worm gear.

One

A large transmission ratio can be obtained, which is more compact than the staggered helical gear mechanism

Two

The meshing tooth surfaces of the two gears are in line contact, and their bearing capacity is much higher than that of the staggered helical gear mechanism

Three

Worm drive is equivalent to screw drive, which is multi tooth meshing drive, so the transmission is stable and the noise is very small.

Four

It is self-locking. When the lead angle of the worm is less than the equivalent friction angle between the meshing teeth, the reverse self-locking can be realized, that is, the worm can only drive the worm wheel, but not the worm wheel.

Five

The transmission efficiency is low and the wear is serious. When the worm gear is meshed, the relative sliding speed between the meshing teeth is large, so the friction loss is large and the efficiency is low.

Six

The axial force of worm is large. The reverse self-locking of the self-locking worm mechanism used in its heavy machinery can play a role of safety protection.

Basic Concepts

If you want to get a larger gear reduction ratio, you need to use worm gear.

Material Science

When the staggered angle of worm and worm is, it should be ensured, and the spiral direction of worm and worm must be the same.Cast tin bronze and aluminum iron bronze are commonly used for worm gear; cast iron can be used for low speed and unimportant transmission.Cast iron bronze: good friction, good gluing resistance, expensive, slightly low strength.Cast aluminum iron bronze: the friction reducing and gluing resistance are slightly poor, but the strength is high and the price is also high.Cast iron: gray; ductile. Aging treatment should be carried out to prevent deformation.

Correct engagement

In the middle plane, the modulus and pressure angle of worm and worm gear are equal respectively, that is, the end modulus of worm gear is equal to the axial modulus of worm and is the standard value; the end pressure angle of worm gear should be equal to the axial pressure angle of worm and is the standard value.

Southern Wedding

If you want to get a larger gear reduction ratio, you need to use worm gear. The gear reduction ratio of worm gear is generally 20:1, sometimes even as high as 300:1 or more.Many worm gears have an interesting feature that other gear sets don’t: the worm can turn the gear easily, but the gear can’t. This is because the protruding angle on the screw is very shallow. When the gear tries to rotate the screw, the friction between the gear and the screw will keep the screw in place.