Spur Gears

The most common type of gears are spur gears, also known as straight-cut gears, and can be found in a multitude of applications. They have been specifically designed to transmit large amounts of power by placing them on parallel shafts which rotate in opposite directions.
Spur gears have an involute profile with straight teeth which project radially and are parallel to the rotation of the axis. This allows for a smoother operation between each gear and permits greater mounting distances. Spur gears can have a central hub or be hubless.
The standard pressure angles in spur gears are 14.5, 20 and 25 degrees, and refer to the angle that force is transmitted between the meshing gears.
Spur gears are capable of meshing with other gears, with many gears being used to create large gear reductions. When they are meshed the gear with the most teeth is referred to as the “gear”, whereas the one with smaller teeth is referred to as the “pinion”.
So what are the advantages?
• High transmission efficiency
• Compact and very easy to install
• Constant velocity ratio
• No slippage – unlike belt drives
• Highly reliable
• Can transmit large amounts of power
Types of spur gears
Plastic spur gears are commonly made from acetal or nylon and have many positive characteristics including being lightweight, non-rusting and quiet. They enable low cost and large production capabilities, and are also able to operate without lubrication. For hygiene reasons, plastic spur gears are an excellent choice for use in industries dealing with food production and medical equipment.
Metal spur gears have more strength, load-carrying capacity and heat resilience than their plastic counterpart. They are more dimensionally stable compared to plastic and can be made from many metals such as aluminium, brass and stainless steel.
Common applications
• Metal cutting machines
• Power plants
• Marine engines
• Mechanical clocks and watches
• Fuel pumps
• Washing machines
• Gear motors and gear pumps
• Rack and pinion mechanisms
• Material handling equipment
• Automobile gear boxes
• Steel mills
• Rolling mills
Spur gears are however very loud and so will not be found in vehicles. When the teeth collide with each other there is an impact noise which is really loud compared to the helical gears found in cars.

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Description Price Module Number of Teeth Material Bore Diameter Hub Diameter Pitch Diameter Face Width
RS庫存編號 521-6395
BrandRS PRO
HK$47.13
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1.5 12 Steel 8mm 21mm 18mm 15mm
RS庫存編號 521-7225
BrandRS PRO
HK$34.33
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0.5 80 POM 6mm 14mm 40mm 3mm
RS庫存編號 521-6452
BrandRS PRO
HK$112.71
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1.5 24 Steel 8mm 28mm 36mm 15mm
RS庫存編號 521-6373
BrandRS PRO
HK$273.40
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1 60 Steel 10mm 35mm 60mm 10mm
RS庫存編號 182-7888
BrandRS PRO
HK$130.36
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0.5 32 Steel 4mm 12mm 16mm 4mm
RS庫存編號 182-7930
BrandRS PRO
HK$114.91
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1.5 28 - 8mm 19mm 42mm 12mm
RS庫存編號 521-7398
BrandRS PRO
HK$28.77
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0.8 56 POM 6mm 14.5mm 44.8mm 4mm
RS庫存編號 521-7483
BrandRS PRO
HK$26.15
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1 16 POM 5mm 10mm 16mm 6mm
RS庫存編號 521-7203
BrandRS PRO
HK$32.32
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0.5 72 POM 6mm 14mm 36mm 3mm
RS庫存編號 521-6446
BrandRS PRO
HK$92.54
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1.5 20 Steel 8mm 24mm 30mm 15mm
RS庫存編號 521-6345
BrandRS PRO
HK$153.00
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1 44 Steel 10mm 35mm 44mm 10mm
RS庫存編號 521-7679
BrandRS PRO
HK$87.10
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1 70 POM 8mm 18mm 70mm 6mm
RS庫存編號 182-7849
BrandRS PRO
HK$417.62
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1.5 55 Steel 15mm 60mm 82.5mm 17mm
RS庫存編號 521-7534
BrandRS PRO
HK$41.88
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1 28 POM 5mm 11.7mm 28mm 6mm
RS庫存編號 182-7911
BrandRS PRO
HK$37.66
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0.7 36 - 6mm 15mm 25.2mm 6mm
RS庫存編號 521-7146
BrandRS PRO
HK$28.16
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0.5 50 POM 5mm 12mm 25mm 3mm
RS庫存編號 521-7685
BrandRS PRO
HK$92.92
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RS庫存編號 182-7958
BrandRS PRO
HK$240.43
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RS庫存編號 182-7804
BrandRS PRO
HK$62.76
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1 15 Steel 6mm 12mm 15mm 15mm
RS庫存編號 521-6430
BrandRS PRO
HK$72.88
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1.5 18 Steel 8mm 22mm 27mm 15mm