Soft Motion
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Rotary Damper
Rotary damper is a rotational device to slow down an objective’s movement.
The temperature-resistant oil generates fluid resistance to achieve the desired soft-closing or soft-opening force, either one-way or two-way. The gentle movement and mute effect make your product feel luxurious and safer, and also offers a brilliant user experience. Click to know more: What is a rotary damper?
Rotary Damper Category
Peir, a rotary damper manufacturer, is working with many world-class companies globally. With a manufacturing base in China and service branches across North America, Europe, South America, and Asia, Peir offers an extensive collection of dampers, ensuring easy and reliable solutions for diverse product designs. These dampers can categorize into different types; they are:
- By rotate angle: Infinite or Finite.
- By working directions: one-way or two-way.
- By design/shape: Vane damper, Gear Damper, Disc Damper, Barrel Damper, etc.
- Torque can be big or small if the size or material changes.
Also, the minimum lifecycle is 30,000, some models can achieve up to 60,000 cycles.
Product Family
Vane Damper (Limited Angle & Infinite Angle)
- Diameter 10 to 22mm
- Torque up to 90KGF.CM
- Max rotate angle:360 degree
- One way or two way damping
- Lifecycles up to 30,000
Gear Damper
- Diameter 10 to 25mm
- Torque up to 4500GF.CM
- Max rotate angle: 360 degree
- One way or two way damping
- Lifecycles up to 60,000
Barrel Damper
- Diameter 8 to 20mm
- Torque up to 23,000GF.CM
- Max rotate angle: 360 degree
- One Way or two way damping
- Lifecycles up to 60,000
Disk Damper
- Diameter 47 to 57mm
- Torque up to 6.0 Nm
- Max rotate angle: 360 degree
- One way or two way damping
- Lifecycles up to 50,000
Keeping Damper
- Diameter 10mm to 16mm
- Torque up to 35KGF.CM
- Max angle 270°
- Two way damping
- Lifecycles up to 25,000
Hydraulic Damper
- 20-35KG rotating body
- Max angle 150°
- One way damping
Spiral-linear Damper (With assist force)
- Diameter 16mm to 21mm
- Torque up to 50KGF.CM
- Max angle 110°
- Two way damping
- Lifecycles up to 30, 000
Driving Motor
- Diameter 28mm
- Torque up to 50KGF.CM
- Max angle 125°
- Lifecycles up to 11,000
Rotary Damper Structure Feature
Vane Damper
Vane dampers operate by rotating attached blades along the axis of rotation.
This movement compresses the silicone oil in the chamber, causing it to flow into the gap between the blade and the body.
The pressure of the silicone oil, combined with the blade area, generates resistance, creating a damping torque on the rotating shaft and blade.
The torque depends on
①the grease viscosity
②vane compression area
③clearance between the vanes and the body.
Working Angle:
Typically used for rotations of less than 180°, vane dampers find applications in various products like lids (e.g., washing machines, toilets, trash cans).
Continuous Rotary Damper
Continuous Rotary Damper (Including barrel damper, gear damper, disc damper)
Continuous Rotary Damper operates by rotating axis.
*As the axis moves, the shell end cover forms a sealed oil chamber, allowing silicone oil to flow into the gap between the rotating body and the shell.
*The viscosity of the silicone oil creates a consistent damping force during axis movement.
The torque generated during shaft rotation is influenced by
①the oil’s viscosity
②the oil chamber’s size
③the gap between the rotating body and the shell.
Working Angle:
This damper type is not restricted by rotation angles and is utilized in various rotary mechanisms.
It is often combined with springs in applications such as shades, screens, and blocking belts.
Spiral Linear Damper
Spiral Linear Damper generates a combined force from hydraulic pressure and the spring, resulting in decelerated rotation and increased resistance.
A spiral ramp on the rotation axis that conveys torque to a piston slider housed inside. The slider, in turn, exerts pressure on a spring, while a check valve ensures closure.
Working Angle:
Typically used for rotations of less than 180°.
Advantage:
1. With small activate angle. (Let’s say for example, even lid is opened less than 20°， the lid can soft close very well)
2. With lift assistant force. ( let’s say for example, when the lid is 5kgf, user can lift the lid easily with less than 2kgf.)
Can’t find the perfect match? We are happy to support you.
Where are Damper Used?
Rotary dampers are used in the interior of vehicles, washing machines, refrigerators, coffee machines, toilet covers, furniture, and much more device with a lid or hinge that requires frequent, quiet, and smooth opening and closing.
How does a rotary damper work?
How do rotary dampers work? Rotary dampers work by rotation around a single axis. The oil inside the damper produces a damping torque on the movement of the moving parts.
How Do I Choose a Rotary Damper( Selection Guide)
1.Select the Rotary Damper by the Movement
Horizontal max 110° to 0°
Vertical from max positive 20° to minus 90°
Vertical from Max positive 90° to minus 90°
Horizontal & Vertical
Continuous rotation
Locate at any angle of the circumference
2.Select the Rotary Damper by the Torque
The torque of the rotary damper mainly depends on the viscosity of the grease, the compression area of the vanes, and the clearance between the vanes and the body.
Torque Calculation：
Example 1:
It shows a tradtional soft closing lid, like toilet seat or top-load washer lid.
To select an appropriate torque, the length and the weight or the centre of gravity of the flap have to be known.
Controlled slow closing down.
Showed on the right figure, the flat starts to close down from position of less than 90 to horizon position.
Example (90°~0°）
M=2kg, L=300mm
Fmax=2*9.8*3.3/2=2.94N.m
Fdamper=3.0N.m
Example 2:
It shows a continuous rotating mechanism or the mechanism with spring, like shade, soft-opening lid)
The interaction between load, spring, and damper, and the rotation torque curve of load acting on damper:
Example:
M=2Kg,d=10mm
Fload=2×9.8×0.01=0.196Nm
F spring=0.3 Nm
F damper=F spring – F load=0.1Nm
Torque Calculation
Damper torque calculation in various senarios.
Controlled slow closing down.
Showed on the right figure, the flat starts to close down from position of less than 90 to horizon position.
T=(W*g)*(L/2)*(cos a)
Temperature & Speed Characteristics
Speed Characteristics
The torque of the rotary damper varies according to RPM. The torque increases if the RPM goes up; the torque decreases if the RPM goes down. In addition, the starting torque slightly differs from the nominal torque.
Normally, torque value indicated in the product spec is measured at 20RPM.
Find Us to Meet Your Customization!
Gas springs can be made in a range of sizes, to meet your design demand.