Miter gear – changes transmission direction only
Miter gears are one type of bevel gears where the two rotational axes intersect. When speaking of narrow definition of bevel gears with ability to increase or decrease speed, miter gears do not have that ability due to the pair’s same number of teeth. Their purpose is limited to the change in transmission direction. Because they are a type of bevel gears, the basic characteristic of bevel gears exist such as presence of gear forms of straight cut, spiral cut and zerol types.
Also, because the shafts can be set to any angle, there are miter gears with non-90 degree (non-perpendicular) angle called angular miter gears. KHK is capable of producing angular miter gears with shaft angles in the range of 45 to 120 degrees.
Because a pair of straight tooth miter gears has the same number of teeth, with the exception of minor differences such as set screw holes and key ways, the same two gears can mate with each other. However, in the case of spiral miter gears, even when the number of teeth are the same, the twisting directions are different. Therefore, the same gear cannot be meshed together, and it is necessary to pair the right and left handed pairs.
Also, to produce straight tooth miter gears. KHK utilizes Coniflex made by Gleason Company that allows the use of crowning method as in making bevel gears which creates final products superior in quietness.
Incidentally, originally the hat worn by Catholic bishop is called mitre and in woodworking the word miter joint is used.
Related links :
Technical Information of Miter Gears
Bevel Gears– Main page of bevel gears
Equivalent tables of each standard relating to raw materials and precision grades of gears
等径锥齿轮 – 中文页
SM
Steel Miter Gears
Module : 1 – 8
Material : S45C
Hardening : None
Tooth finish : Cut (non Ground)
Grade : JIS 3
Popular straight miter with many uses.
SMA / SMB / SMC
Finished Bore Miter Gears
Module : 1 – 8
Material : S45C
Hardening : Induction hardening
Tooth finish : Cut (non Ground)
Grade : JIS 4
Usable without re-machining, available in three bore sizes.
SMS
Spiral Miter Gears
Module : 1 – 8
Material : S45C
Hardening : Induction hardening
Tooth finish : Cut (non Ground)
Grade : JIS 4
Popular spiral miter gears with large selection of modules and numbers of teeth.
SMSG
Ground Spiral Miter Gears
Module : 2 – 5
Material : S45C
Hardening : Induction hardening
Tooth finish : Ground teeth
Grade : JIS 2
Reasonably priced ground gear, yet re-machinable except the gear teeth.
SMZG
Ground Zerol Miter Gears
Module : 2 – 3
Material : S45C
Hardening : Induction hardening
Tooth finish : Ground teeth
Grade : JIS 2
Spiral miter gear with less than 10 degrees helix angle. The force acting on the gear is the same as straight miter and is a high precision product.
MM
Curburized/Hardened Miter Gears
Module : 2 – 5
Material : SCM415
Hardening : Curburized
Tooth finish : Cut (non Ground)
Grade : JIS 4
Compared to SM miters, stronger and better abrasion resistant, secondary operation is possible.
MMS
Spiral Miter Gears
Module : 2 – 5
Material : SCM415
Hardening : Curburized
Tooth finish : Cut (non Ground)
Grade : JIS 4
Using SCM415 material, only teeth are induction hardened allowing secondary operations elsewhere.
MMSA / MMSB
Finished Bore Spiral Miter Gears
Module : 1 – 10
Material : SCM415
Hardening : Curburized
Tooth finish : Cut (non Ground)
Grade : JIS 4
Ready to use without performing secondary operations. Strong and abrasion resistant.
MMSG
Ground Spiral Miter Gears
Module : 2 – 4
Material : SCM415
Hardening : Curburized
Tooth finish : Ground teeth
Grade : JIS 1
High strength and superior abrasion resistance, high speed and high torque transmission allow for compact design.
Nissei KSP
Ground Spiral Miter Gears
Module : 1.5 – 6
Material : SCM415
Hardening : Curburized
Tooth finish : Ground teeth
Grade : JIS 0
Superior performance in high speed use with respect to noise and vibration.
SUM
Stainless Steel Miter Gears
Module : 1 – 4
Material : SUS303
Hardening : None
Tooth finish : Cut (non Ground)
Grade : JIS 3
Uses SUS303 material. Best suited for food machinery for its rust resistance.
SUMA
Finished Bore Stainless Steel Miter Gears
Module : 1 – 4
Material : SUS303
Hardening : None
Tooth finish : Cut (non Ground)
Grade : JIS 3
Usable without re-machining in stainless steel.
LM
Sintered Metal Miter Gears
Module : 0.8 – 1.5
Material : SMF5040
Hardening : None
Hardening : None
Tooth finish : Sintered
Grade : JIS 5
Mass produced low cost sintered gear. Small and lightweight products.
SAM
Angular Miter Gears
Module : 1.5 – 3
Material : S45C
Hardening : None
Tooth finish : Cut (non Ground)
Grade : JIS 3
Available in three types: 45, 60 and 120 degree shaft angles.
PM
Plastic Miter Gears
Module : 1 – 4
Material : MC901
Hardening : None
Tooth finish : Cut (non Ground)
Grade : JIS 4
Light products using MC Nylon, possible to use without lubrication.
DM
Injection Molded Miter Gears
Module : 0.5 – 1.5
Material : DURACON
Hardening : None
Tooth finish : Injection Molded
Grade : JIS 6
Injection molded mass produced item suitable for office machines.
BB
Sintered Metal Bushings