Spur Gears

TOP>Spur GearsWhat is a spur gear ?

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 hJasa Hobbing and, 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 KHK 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.

Please enter part number here for a price and a drawing of the gear

NOTICE: Use of CAD DrawingsThe tooth profile detailed in the CAD drawing differs from that of the actual gear.Also, please note that thedetails of any chamfer, fillet,or slotted groove on the CAD drawing may differ from thetrue values or shape on the actual product.

With this technical data you can view comprehensive information regarding KHK spur gears such as their features and advice and warnings when selecting and using them.

DP : 4 Jasa Hobbing – 12Material : S45C (AISI/SAE 1045)Hardening : NoneTooth finish : Cut (non-ground)Grade : JIS N8 (equiv.to AGMA 8,9)

Spur Gears with inch based DP tooth pitch

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Module : 1 – 4Material : SCM415Hardening : Overall CarburizingTooth finish : Ground teethGrade : JIS N5

Fully hardened, ground and keyway machined gears with excellent accuracy, strength and abrasion Jasa Hobbing resistance.

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Module : 1 – 3Material : SCM440Hardening : Thermal refined, gear teeth induction hardenedTooth finish : Ground teethGrade : JIS N6

Gears that have been tempered, hardened and ground that have excellent accuracy, strength and abrasion resistance. Secondary operations can be performed except for the teeth. This product is ideal for the pinion of the KRGF rack.

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Module : 1.lima – tigaMaterial : S45CHardening : Thermal refined, gear teeth induction hardenedTooth finish : Ground teethGrade : JIS N7

Gears with shafts that have been tempered, hardened and ground. Secondary operations can be performed except for the teeth.

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Module : 0.5 – 10Material : S45CHardening : Gear teeth induction hardened (Please see details on PDF)Tooth finish : Ground teethGrade : JIS N7

Gears that have been hardened and ground with a good balance of accuracy, wear resistance and cost. Secondary operations are possible except for the teeth.

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Module : 2 – 3Material : S45CHardening : Gear teeth induction hardenedTooth finish : Ground teethGrade : JIS N7 equivalent

No rattling of shaft and gear when fastening

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Module : 1.lima – 6Material : S45CHardening : Gear teeth induction hardenedTooth finish : Ground teethGrade : JIS N7 equivalent

Products matching the mounting holes of the corresponding speed reducer series

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Module : 3 – 6 / CP : 10 – 20Material : S45C / SCM440Hardening : Gear teeth induction hardenedTooth finish : Ground teethGrade : JIS N7 / N6 equivalent

Perfect for Nabtesco Corporation’s GH Series

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Module : 1 – 6Material : S45CHardening : Gear teeth induction hardened (Please see details on PDF)Tooth finish : Ground teethGrade : JIS N7

Gears that have been hardened and ground with a good balance of accuracy, wear resistance and cost. Secondary operations are possible except for the teeth.

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Module : 1.5 – limaMaterial : SCM440Hardening : Gear teeth induction hardenedTooth finish : Cut (non-ground)

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Module : 1.5 – limaMaterial : SCM440Hardening : Thermal Refined onlyTooth finish : Cut (non-ground)Grade : JIS N8

Tempered gears with excellent bending strength. The teeth can be additionally hardened. This product is ideal for the pinion of the KRF rack.

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Module : 1, 1.5Material : S45CHardening : Thermal refined (Please see details on PDF)Tooth finish : Cut (non-ground)Grade : JIS N8 (Please see details on PDF)

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Module : 0.5 – 10Material : S45CHardening : NoneTooth finish : Cut (non-ground)Grade : JIS N8 (Please see details on PDF)

Many lineups are available at a low price. The teeth can be additionally hardened.

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Module : 1.5 – 3Material : S45CHardening : NoneTooth finish : Cut (non-ground)Grade : JIS N8 equivalent

No rattling of shaft and gear when fastening

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Module : 1 – limaMaterial : S45CHardening : NoneTooth finish : Cut (non-ground)Grade : JIS N8 (Please see details on PDF)

Many lineups are available at a low price. The teeth can be additionally hardened.

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Module : 2 – 3Material : S45CHardening : NoneTooth finish : Cut (non-ground)Grade : JIS N8 equivalent

No rattling of shaft and gear when fastening

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Module : 0.8, 1Material : S45CHardening : NoneTooth finish : Cut (non-ground)Grade : JIS N8 (Please see details on PDF)

Gears with narrow teeth. Suitable for light loads.

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Steel Hubless Thin Face Spur Gears

Module : 1Material : S45CHardening : NoneTooth finish : Cut (non-ground)Grade : JIS N8 (Please see details on PDF)

Gears with narrow teeth. Suitable for light loads.

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Module : 1 – 4Material : SUS303Hardening : NoneTooth finish : Cut (non-ground)Grade : JIS N8

Stainless steel gears with rust resistance.

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Module : 0.5 – 1Material : SUS303Hardening : NoneTooth finish : Cut (non-ground)Grade : JIS N8 (Please see details on PDF)

Stainless steel gears with rust resistance. Locking Hub allows easy attachment.

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