Product Details

SPUR GEARS

Spur gears are the most easily visualized common gears that transmit motion between two parallel shafts. Because of their shape, they are classified as a type of cylindrical gears. Since the tooth surfaces of the gears are parallel to the axes of the mounted shafts, there is no thrust force generated in the axial direction. Also, because of the ease of production, these gears can be made to a high degree of precision. On the other hand, spur gears have a disadvantage in that they easily make noise. Generally speaking, when two spur gears are in mesh, the gear with more teeth is called the “gear” and the one with the smaller number of teeth is called the “pinion”.

 

 

The unit to indicate the sizes of spur gears is commonly stated, as specified by ISO, to be “module”. In recent years, it is usual to set the pressure angle to 20 degrees. In commercial machinery, it is most common to use a portion of an involute curve as the tooth profile.

Even though not limited to spur gears, profile shifted gears are used when it is necessary to adjust the center distance slightly or to strengthen the gear teeth. They are produced by adjusting the distance between the gear cutting tool called the hobbing tool and the gear in the production stage. When the shift is positive, the bending strength of the gear increases, while a negative shift slightly reduces the center distance. The backlash is the play between the teeth when two gears are meshed and is needed for the smooth rotation of gears. When the backlash is too large, it leads to increased vibration and noise while the backlash that is too small leads to tooth failure due to the lack of lubrication.

All spur gears have an involute tooth shape. In other words, they are involute gears using part of the involute curve as their tooth forms. Looking generally, the involute shape is the most wide-spread gear tooth form due to, among other reasons, the ability to absorb small center distance errors, easily made production tools simplify manufacturing, thick roots of the teeth make it strong, etc. Tooth shape is often described as a specification in drawing of a spur gear as indicated by the height of teeth. In addition to standard full depth teeth, extended addendum and stub tooth profiles exist.

Advantages of the Right-Angle Gearboxes from KG

All spur gears have an involute tooth shape. In other words, they are involute gears using part of the involute curve as their tooth forms. Looking generally, the involute shape is the most wide-spread gear tooth form due to, among other reasons, the ability to absorb small center distance errors, easily made production tools simplify manufacturing, thick roots of the teeth make it strong, etc. Tooth shape is often described as a specification in drawing of a spur gear as indicated by the height of teeth. In addition to standard full depth teeth, extended addendum and stub tooth profiles exist.

SG GROUND SPUR GEAR

Material (ISO) : SCM435 or SCM440
Module : 0.5 – 3.0
Number of teeth : 14 to 120
ISO class N5

SG GROUND SPUR GEAR SHAFTS

Material (ISO) : SCM435 or SCM440
Module : 0.5 – 2.0
Number of teeth : 14 to 26
ISO class N5

SGE GROUND SPUR GEARS

Material (ISO) : S45C 
Module : 0.5 – 3.0
Number of teeth : 14 to 120
ISO class N7

SPUR GEARS

304 STAINLESS STEEL SPUR GEARS

Material (ISO) : SUS304
Module : 0.5 – 2.0
Number of teeth : 14 to 120
ISO class N9

Gears made out of 304 stainless steel providing better corrosion resistance than 303 stainless steel.

304 STAINLESS STEEL SPUR GEAR

Material (ISO) : SUS304
Module : 1.0 – 3.0
Number of teeth : 14 to 120
ISO class N9

Gears made out of 304 stainless steel providing better corrosion resistance than 303 stainless steel.

PLASTIC SPUR GEAR

Material : POM (White)
Module : 0.5 – 1.0
Number of teeth : 14 to 100
ISO class N9 – N10

Polyacetal (POM) gears have a lower water absorption rate and dimensional stability compared with nylon gears.