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.
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.
Click Here to Select Screw Gears
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.
Click Here to Select Screw Gears
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.
Click Here to Select Screw Gears
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.
Click Here to Select Screw GearsRelated 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