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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Täpsem kirjeldus Brand Module Number Of Teeth Material Bore Diameter Hub Diameter Pitch Diameter Face Width
RS PRO Steel 16 Teeth Spur Gear, 24mm Pitch Diam. , 20mm Hub Diam. , 8mm Bore Diam. RS Pro 1.5 16 Steel 8mm 20mm 24mm 17mm
RS PRO 30 Teeth Spur Gear, 30mm Pitch Diam. , 15mm Hub Diam. , 6mm Bore Diam. RS Pro 1 30 - 6mm 15mm 30mm 9mm
RS PRO 15 Teeth Spur Gear, 15mm Pitch Diam. , 9mm Hub Diam. , 4mm Bore Diam. RS Pro 1 15 - 4mm 9mm 15mm 9mm
RS PRO Steel 40 Teeth Spur Gear, 40mm Pitch Diam. , 25mm Hub Diam. , 10mm Bore Diam. RS Pro 1 40 Steel 10mm 25mm 40mm 15mm
RS PRO Steel 15 Teeth Spur Gear, 22.5mm Pitch Diam. , 18mm Hub Diam. , 8mm Bore Diam. RS Pro 1.5 15 Steel 8mm 18mm 22.5mm 17mm
RS PRO Steel 15 Teeth Spur Gear, 15mm Pitch Diam. , 12mm Hub Diam. , 6mm Bore Diam. RS Pro 1 15 Steel 6mm 12mm 15mm 15mm
RS PRO 20 Teeth Spur Gear, 20mm Pitch Diam. , 9mm Hub Diam. , 4mm Bore Diam. RS Pro 1 20 - 4mm 9mm 20mm 9mm
RS PRO Steel 20 Teeth Spur Gear, 20mm Pitch Diam. , 16mm Hub Diam. , 8mm Bore Diam. RS Pro 1 20 Steel 8mm 16mm 20mm 15mm
RS PRO 12 Teeth Spur Gear, 12mm Pitch Diam. , 9mm Hub Diam. , 4mm Bore Diam. RS Pro 1 12 - 4mm 9mm 12mm 9mm
RS PRO Steel 30 Teeth Spur Gear, 30mm Pitch Diam. , 20mm Hub Diam. , 8mm Bore Diam. RS Pro 1 30 Steel 8mm 20mm 30mm 15mm
RS PRO 15 Teeth Spur Gear, 30mm Pitch Diam. , 18.5mm Hub Diam. , 8mm Bore Diam. RS Pro 2 15 - 8mm 18.5mm 30mm 15mm
RS PRO 25 Teeth Spur Gear, 37.5mm Pitch Diam. , 19mm Hub Diam. , 8mm Bore Diam. RS Pro 1.5 25 - 8mm 19mm 37.5mm 12mm
RS PRO Steel 30 Teeth Spur Gear, 45mm Pitch Diam. , 30mm Hub Diam. , 12mm Bore Diam. RS Pro 1.5 30 Steel 12mm 30mm 45mm 17mm
RS PRO 15 Teeth Spur Gear, 22.5mm Pitch Diam. , 14mm Hub Diam. , 6mm Bore Diam. RS Pro 1.5 15 - 6mm 14mm 22.5mm 12mm
RS PRO 18 Teeth Spur Gear, 27mm Pitch Diam. , 17mm Hub Diam. , 8mm Bore Diam. RS Pro 1.5 18 - 8mm 17mm 27mm 12mm
RS PRO 40 Teeth Spur Gear, 40mm Pitch Diam. , 18mm Hub Diam. , 8mm Bore Diam. RS Pro 1 40 - 8mm 18mm 40mm 9mm
RS PRO Steel 20 Teeth Spur Gear, 30mm Pitch Diam. , 25mm Hub Diam. , 8mm Bore Diam. RS Pro 1.5 20 Steel 8mm 25mm 30mm 17mm
RS PRO 16 Teeth Spur Gear, 16mm Pitch Diam. , 9mm Hub Diam. , 4mm Bore Diam. RS Pro 1 16 - 4mm 9mm 16mm 9mm
RS PRO 16 Teeth Spur Gear, 24mm Pitch Diam. , 14mm Hub Diam. , 6mm Bore Diam. RS Pro 1.5 16 - 6mm 14mm 24mm 12mm
RS PRO 30 Teeth Spur Gear, 21mm Pitch Diam. , 12mm Hub Diam. , 6mm Bore Diam. RS Pro 0.7 30 - 6mm 12mm 21mm 6mm
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