GEARS

Spur Gears   |   Internal Spur Gears   |   Helical Gears   |   Rack Gears   |   Bevel and Miter Gears   |   Worm Gears   |   Worm Wheel Gears

Anti Backlash Gears   |   Cluster Gears   |   Gear Blanks   |   Pinion Shafts   |   Ratchets and Pawls Gears   |   Spur Gear Stock   |   Spur Gears

W. M. Berg Inc, Cudahy, WI 53110, manufactures numerous styles of gears. Each gear has a specific purpose and serves its own particular application.
Engineering and application support is the heart of Berg. Our Engineering staff offers design and analysis services as well as after-sale technical support and troubleshooting.

Berg has been synonymous with quality for years, but the road to quality has been paved with numerous inspections and long lead times. Berg’s Six Sigma Quality Program is aimed at the goal of improving PROCESSES to ensure high quality.

How Gears Work | Why We Need Gears | Spur Gears | Internal Spur Gears

Helical Gears | Rack Gears | Bevel & Miter Gears | Worm Wheel Gears | Worm Gears | Ratchet Spur Gear & Pawl

How A Gear Works

Imagine two disks are placed side by side, tangent to each other (both touching), if one disk was rotated, due to friction (caused by surface roughness) the other disk would also rotate (in the opposite direction); however, slippage would be introduced due to variation in the surface roughness. Now if we were to increase that surface roughness by cutting the disks and forming teeth on the circumference (circular outer part) then slippage would be eliminated. As a result, we would have one of the most important fundamental mechanical devices, which can manipulate speed, torque and rotational axis. Almost all machines that involve rotation have gears. Gears are found in everything from cars to clocks.

Why We Need Gears?

Gears have neat characteristics which aid in the development of complex machineries:

1. Gears can reverse the direction of rotation

2. It can change the speed or torque (turning force) of rotation

3. It can transfer rotation to a different axis or translate rotational into linear motion or vice versa

Spur Gears

Definition: a gear having straight teeth cut on the rim, parallel to the axis of rotation

» Most common & cost-effective type of gear
» Designed to transmit motion & power between parallel shafts, which rotates in the opposite direction
» Plastic, brass, steel, & aluminum are the materials generally used for manufacturing
» Electric screwdrivers, oscillating sprinklers, windup alarm clocks, washing machines, clothe dryers & conveyors are just a few everyday machines where spur gears are used
» Spur gears are also used in construction equipments, machine tools, marine hoists, turbine drives, multi-spindle drives, indexing equipments & roller feeds

Note: in order for spur gears to work together (mesh) they must have the same diametral pitch (pitch) & pressure angle (PA)
more about spur gears

Internal Spur Gears

Definition: a gear having straight teeth cut on the inner rim, parallel to the axis of rotation

» Spur gear turned “inside out”, teeth are cut into the inside diameter
» Cost-effective & durable
» Designed to transmit motion & power between parallel shafts, which rotates in the same direction
» Ideal for light-duty applications
» Plastic, brass, steel, & aluminum are the materials generally used for manufacturing
» Electric screwdrivers, oscillating sprinklers, windup alarm clocks & pumps are just a few everyday machines where internal gears are used
» Internal gears are also used in positioning equipments, roller tools, indexing equipments & timing systems

Note: in order for internal & spur gears to work together (mesh) they must have the same diametral pitch (pitch) & pressure angle (PA)
more about internal spur gears

Helical Gears

Definition: a bar or rectangular gear (flat, no curvature) having straight teeth cut on the face, perpendicular to the axis of motion

» Spur gear teeth “curved”, teeth are cut at an angle
» Designed to transmit motion & power between either parallel or right angle shafts (90°, non-intersecting), which rotates in the opposite direction
» Durable & ideal for high load applications
» Plastic, brass, steel, & aluminum are the materials generally used for manufacturing
» Automobiles, elevators, conveyors, compressors & blowers are just a few everyday machines where helical gears are used
» Helical gears are also used in machine tools, turbine drives, feed drives, sand mullers, rolling mills & marine applications

Note: in order for helical gears to work together (mesh) they must have the same diametral pitch (pitch), pressure angle (PA) & helix angle
more about helical gears

Rack Gears

Definition: a bar or rectangular gear (flat, no curvature) having straight teeth cut on the face, perpendicular to the axis of motion

» Spur gear “opened” & “laid flat” on bore, teeth are cut on the face
» Designed to translate rotational into linear motion or vice versa
» Durable & ideal for high load applications
» Plastic, brass, steel, & aluminum are the materials generally used for manufacturing
» Automobiles, scales, lift mechanisms, shakers & guide mechanisms are just a few everyday machines where rack gears are used
» Rack gears are also used in construction equipments, X - Y axis tables, machine tools, marine hoists, multi-spindle drives & indexing equipments

Note: in order for rack & pinion gears to work together (mesh) they must have the same diametral pitch (pitch) & pressure angle (PA)
more about rack gears

Bevel & Miter Gears

Definition: a gear having teeth cut on the body, perpendicular to the axis of rotation

» Gear teeth are placed conically on the body
» Miter is a special type of bevel gear, whose dimensions are identical to its mating part (equal size gears)
» Designed to transmit motion & power between right angle shafts (90°, intersecting), which rotates in the opposite direction
» Durable & ideal for high load applications
» Plastic, brass, steel, & aluminum are the materials generally used for manufacturing
» Hand drills, printers, automobiles, locomotives, elevators & blowers are just a few everyday machines where bevel gears are used
» Bevel gears are also used in machine tools, material handlers, conveyors, cooling towers, power plants, rotorcrafts & marine applications

Note: in order for bevel gears to work together (mesh) they must have the same diametral pitch (pitch), pressure angle (PA) & face width
more about bevel and miter gears

Worm Wheel Gears

Definition: a shaft having helical cuts (threads) on the surface, perpendicular to the axis of rotation

» Similar to spur gear except teeth are “concaved in”
» Designed to transmit motion & power between right angle shafts (90°, non-intersecting), which rotates in the opposite direction
» Worm & worm wheel is the most compact type of gear system
» Smoothest & quietest form of gearing
» Plastic, brass, steel, & aluminum are the materials generally used for manufacturing
» Musical instruments, mechanical gates & conveyors are just a few everyday machines where worm wheels are used
» Worm wheels are also used in machine tools, torsen differentials, indexing equipments, packaging & food processing machinery

Note: in order for wheel & worm gears to work together (mesh) they must have the same thread, diametral pitch (pitch) & pressure angle (PA)
more about worm wheel gears

Worm Gears

Definition: a gear whose teeth are cut at a slant on the rim, parallel to the axis of rotation

» Shaft with screw threads, similar to ordinary screws
» Designed to transmit motion & power between right angle shafts (90°, non-intersecting), which rotates in the opposite direction
» Worm & worm wheel is the most compact type of gear system
» Smoothest & quietest form of gearing
» Plastic, brass, steel, & aluminum are the materials generally used for manufacturing
» Musical instruments, mechanical gates & conveyors are just a few everyday machines where worms are used
» Worms are also used in machine tools, torsen differentials, indexing equipments, packaging & food processing machinery

Note: in order for wheel & worm gears to work together (mesh) they must have the same thread, diametral pitch (pitch) & pressure angle (PA)
more about worm gears

Ratchet & Pawl Gears

» Ratchet is a spur gear with slanted teeth; pawl, its counter part, is a claw like structure which locks the ratchet in position
» Cost-effective & durable
» Designed to prevent reverse rotation (single-direction device)
» Durable & ideal for all types of applications
» Plastic, brass, steel, & aluminum are the materials generally used for manufacturing
» Clocks, cable ties, jacks, screwdrivers, wrench & turnstiles are just a few everyday machines where ratchets are used
» Ratchets are also used in hoists, spanners, jacks, capstans & winders

Note: in order for ratchets & pawls to work together (mesh) they must have the same diametral pitch (pitch)
more about ratchet and pawl gears