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Screw Gears

Screw Gears Used for Non-Intersecting Shafts

Screw gears, also sometimes called crossed helical gears, are helical gears used in motion transmission between non-intersecting shafts. The helical gears used in parallel shafts have the same helix angle but in the opposite directions. For shaft angles other than parallel, an arbitrary helix angle can be chosen, and, assuming no profile shift, the intersecting angle of the shafts is the sum of the respective helix angles. Helical gears have point contacts and have lower efficiency than parallel or perpendicular shaft gears and cannot transmit heavy loads.

Also, if the same material is used in screw gears, it could lead to friction and galling. Therefore, KHK recommends the use of different materials in a pair. Besides, unlike bevel gears, there are no restrictions on the numbers of teeth combinations and the speed transmission ratio becomes the number of teeth of the driving gear divided by the number of teeth of the driven gear. Please consult the “Gear Applications” pages for the actual working of screw gears.

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SN_steel_screw_gears

SN

Steel Screw Gears

Module : 1 – 4
Material : S45C
Hardening : None
Tooth finish : Cut (non-ground)
Grade : JIS N9

Popular screw gears. Additionally, gear tooth induction hardening second-ary operations can be performed. J Series products are also available.

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SUN_ScrewGears

SUN

Stainless Steel Screw Gears

Module : 1 – 3
Material : SUS303
Hardening : None
Tooth finish : Cut (non-ground)
Grade : JIS N9

Suitable for food machinery due to SUS303’s rust-resistant qualities.

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AN_ScrewGears

AN

Aluminum Bronze Screw Gears

Module : 1 – 3
Material : CAC702 (AlBC2)
Hardening : None
Tooth finish : Cut (non-ground)
Grade : JIS N9

Aluminum bronze made products have excellent wear resistance.

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PN_ScrewGears

PN

Plastic Screw Gears

Module : 1 – 3
Material : MC901
Hardening : None
Tooth finish : Cut (non-ground)
Grade : JIS N9

Light-weight products made of MC Nylon can be used without lubrication.

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Related links :
Technical Information of Screw Gears
Helical Gears– Main page of helical gears
Equivalent tables of each standard relating to raw materials and precision grades of gears
Plastic Gears– A page of plastic gears
交错轴斜齿轮 (螺旋齿轮) – 中文页

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