QD-Buchsen

QD bushings, or quick-disconnect bushings, are indispensable in the industrial power transmission and agricultural sectors for a wide array of applications including sprockets, sheaves, pulleys, and synchronized drives. At AGKNX, our QD bushings are synonymous with superior holding power and unmatched strength across diverse applications. Crafted from high-grade steel and precision-machined for perfect fitment, our QD bushings offer reliability and durability that stand the test of time.

QD Bushing Dimensions

QD Bushing Dimensions
QD Bushing Dimensions
QD Bushing Dimensions
QD Bushing Dimensions
QD-Buchse
Typ
Dimensions(in)Bolzen
Circle
(In)
Cap Screws IncludedSet
Screw
Größe
ABDEFGLNEIN.FadenLänge
(In)
JA3/81.375211/169/161/81-1/161-21/32310-24110-24
SH7/161.8712-11/167/813/163/161-5/162-1/431/4-201-3/81/4
SDS1/22.1873-3/167/83/43/161-3/82-11/1631/4-201-3/81/4
SD1/22.1873-3/161-5/161-1/43/161-13/162-11/1631/4-201-7/81/4
SK9/162.8123-7/81-3/81-1/43/161-15/163-5/1635/16-1825/16
SF9/163.1254-5/81-1/21-1/41/42-1/163-7/833/8-1625/16
E3/43.83461-7/81-5/85/162-5/8531/2-132-3/43/8
F13/164.4376-5/82-13/162-1/23/83-5/85-5/839/16-123-5/81/2
J15.1487-1/43-1/23-3/163/84-1/26-1/435/8-114-1/25/8
M1-1/46.50095-1/25-3/163/86-3/47-7/843/4-106-3/43/4
N1-1/27.000106-5/86-1/47/168-1/88-1/247/8-98-1/23/4
P1-3/48.25011-3/47-5/87-1/41/29-3/81041-89-1/27/8
W210.437159-3/891/211-3/812-3/441-1/8-11.511-1/21
S3-1/412.12517-3/412-1/2121/215-3/41551-1/4-15.515-1/21-1/4

What are the QD Bushings?

QD bushings, or quick-disconnect bushings, are indispensable in the industrial power transmission and agricultural sectors for a wide array of applications including sprockets, sheaves, pulleys, and synchronized drives. At AGKNX, our QD bushings are synonymous with superior holding power and unmatched strength across diverse applications. Crafted from high-grade steel and precision-machined for perfect fitment, our QD bushings offer reliability and durability that stand the test of time. Designed for effortless installation and removal, our QD bushings feature a single split extending through the entire length, allowing for both conventional and reverse mounting styles to accommodate your precise needs. These innovative components excel even in the most demanding conditions and rugged applications worldwide. We maintain a comprehensive inventory of standard sizes and also offer custom QD bushings, including stainless steel options, upon request.

Geteilte Kegelbuchse

Key Benefits of QD Bushings

Quick disconnect (QD) bushings offer several advantages in industrial applications, particularly for mounting pulleys, sprockets, and sheaves onto shafts. Here are the key benefits:

1. Ease of Installation and Removal: QD bushings are designed for quick and straightforward mounting. They require only a few screws to secure or release, saving significant time compared to other bushing types like taper-lock, which are built for more permanent setups.

2. Strong Clamping Force: Their split design and gradual taper provide a tight, reliable grip on the shaft, ensuring components stay securely in place without slippage, even under high torque loads.

3. Versatility: QD bushings accommodate a wide range of bore sizes and shaft diameters, making them compatible with various sprockets, pulleys, and other components. This flexibility reduces the need for custom machining.

4. Time Efficiency: The quick-disconnect feature allows for rapid component changes, minimizing downtime during maintenance or reconfiguration of machinery.

5. Durability: Typically made from robust materials like steel or cast iron, QD bushings handle significant torque and wear, offering long-term reliability in demanding environments.

6. Reduced Shaft Damage: The design distributes load evenly, minimizing wear or scoring on the shaft, which can extend the lifespan of both the shaft and the bushing.

QD Bushing Benefits
QD Bushing Benefits

Applications of QD Bushings

1. Industriemaschinen

  • Fördersysteme: QD bushings are used to mount pulleys or sprockets in conveyor belts for material handling in industries like manufacturing, mining, and logistics.
  • Pumps and Compressors: They secure components in pumps and compressors, enabling efficient power transfer in HVAC systems, water treatment plants, and industrial processes.
  • Mixers and Agitators: QD bushings are employed in mixers for food processing, chemical production, and pharmaceuticals to ensure reliable torque transmission.

2. Landwirtschaftliche Geräte

  • Tractors and Harvesters: QD bushings are used in power take-off (PTO) systems and other driveline components to connect pulleys or gears for tasks like plowing, harvesting, or irrigation.
  • Grain Handling Systems: They mount sprockets in augers and conveyors for moving grain in silos or processing facilities.

3. HLK-Systeme

  • Gebläse und Lüfter: QD bushings are used to attach fan blades or pulleys in heating, ventilation, and air conditioning systems, ensuring smooth operation in commercial and industrial HVAC setups.

4. Power Transmission Systems

  • Belt Drives: QD bushings are commonly used with V-belt or timing belt pulleys in applications requiring variable speed or torque, such as in textile machinery or printing presses.
  • Kettenantriebe: They mount sprockets for chain-driven systems in packaging machines, bottling lines, and automotive assembly lines.

5. Mining and Quarrying

  • Crushers and Screens: QD bushings are used in heavy-duty equipment like rock crushers and vibrating screens to mount drive components, handling high torque and shock loads.
  • Conveyor Drives: They facilitate power transmission in belt or chain conveyors used to transport ore, coal, or aggregates.

6. Automobil- und Transportwesen

  • Belt and Pulley Systems: QD bushings are used in auxiliary systems like alternators, water pumps, or air conditioning compressors in heavy-duty vehicles.
  • Rail and Marine Applications: They secure components in propulsion systems or auxiliary machinery in trains and ships.

    7. Food and Beverage Processing

    • Packaging Equipment: QD bushings are used in conveyors, fillers, and capping machines due to their ability to be quickly swapped out for maintenance in hygienic environments.
    • Mixing and Grinding: They secure components in blenders, grinders, and slicers, supporting high-speed operations with minimal downtime.

    8. Erneuerbare Energiesysteme

    • Windkraftanlagen: QD bushings are used in gearboxes and generators to connect rotating components, allowing for easy maintenance in remote installations.
    • Solar Tracking Systems: They mount gears or pulleys in mechanisms that adjust solar panels for optimal sun exposure.
    QD-Buchse für Pumpen und Kompressoren

    Pumps and Compressors

    QD-Buchse für Riemen- und Riemenscheibensysteme

    Belt and Pulley Systems

    QD-Buchse für Fördersysteme

    Fördersysteme

    QD-Buchse für Traktoren und Erntemaschinen

    Tractors and Harvesters

    QD-Buchse für Brecher und Siebe

    Crushers and Screens

    QD Bushing for Wind Turbines

    Windkraftanlagen

    QD Bushing Installation Steps

    Conventional mounting involves inserting the bolts through the sprocket/sheave first, then threading them into the bushing. The assembly is then positioned onto the shaft with the bushing flange facing inward and the bolt heads facing outward, as illustrated in Figure 2.

    Reverse mounting, on the other hand, requires placing the bolts through the bushing first, and then threading them into the sprocket/sheave. The assembly is then placed onto the shaft with the sprocket/sheave facing inward and the bolt heads facing outward, as depicted in Figure 2. Conventional mounting is typically the preferred method.

    (1) Welle, Buchsenbohrung, Außenseite der Buchse und Nabenbohrung des Kettenrads/der Riemenscheibe gründlich reinigen, um Öl, Farbe und Schmutz zu entfernen. Zusätzlich alle Grate abfeilen.
    Note: Avoid lubricating the bushing taper, hub taper, bushing bore, or shaft to prevent the risk of sprocket/sheave hub fracture. DO NOT USE LUBRICANTS.

    (2) Zum Montieren von Kettenrad/Riemenscheibe und Buchse schieben Sie das Kettenrad/die Riemenscheibe auf die konische Buchsenfläche und achten Sie dabei auf die korrekte Ausrichtung. Richten Sie die gewindelosen Löcher in der Kettenrad-/Riemenscheibennabe mit den Gewindelöchern im Buchsenflansch aus. Ziehen Sie anschließend die Zylinderschrauben mit den Sicherungsscheiben handfest an. Montieren Sie nun die Kettenrad-/Riemenscheiben- und Buchsenbaugruppe auf der Welle. Positionieren Sie den Buchsenflansch je nach Ihren Anforderungen nach innen oder außen. Bei manchen Baugruppen ist auch eine umgekehrte Montage möglich, bei der der Buchsenflansch nach außen zeigt. Die Zylinderschrauben können dann weiterhin von außen angezogen werden.

    (3) Setzen Sie die Baugruppe mit der Passfeder in die Keilnut der Welle auf die Welle. Dabei ist eine leichte axiale Bewegung des Kettenrads/der Riemenscheibe während des Anziehens möglich. Alternativ kann es bei der Montage großer oder schwerer Teile in einer herkömmlichen Halterung einfacher sein, Passfeder und Buchse zuerst auf der Welle zu montieren. Setzen Sie dann das Kettenrad/die Riemenscheibe auf die Buchse und richten Sie die Bohrungen entsprechend aus.
    Note: When mounting sprockets/sheaves on a vertical shaft, take precautions to prevent the sprocket/sheave and/or bushing from falling during installation.

    QD-Buchse einbauen

    Figure 2

    (4) Alternativ können die Kappenschrauben nacheinander so weit angezogen werden, bis Kettenrad/Riemenscheibe und Buchsenkegel vollständig ineinandergreifen. Verwenden Sie dabei etwa die Hälfte des in Tabelle 2 angegebenen empfohlenen Anzugsmoments.

    (5) Überprüfen Sie die Ausrichtung und den axialen Rundlauf (das Taumeln) des Kettenrads/der Riemenscheibe und nehmen Sie gegebenenfalls Anpassungen vor, um eine korrekte Ausrichtung zu gewährleisten.

    (6) Ziehen Sie die Zylinderschrauben abwechselnd weiter an, bis die in Tabelle 2 unten angegebenen empfohlenen Drehmomentwerte erreicht sind. Überschreiten Sie nach Erreichen des empfohlenen Drehmoments dieses nicht mehr.
    Hinweis: Zu hohes Anzugsmoment der Schrauben kann zu Beschädigungen an Kettenrad/Riemenscheibe und/oder Buchse führen. Bei korrekter Montage muss ein Spalt zwischen dem Buchsenflansch und dem Kettenrad/der Riemenscheibe vorhanden sein.

    (7) Falls vorhanden, ziehen Sie die Stellschraube fest, um den Schlüssel während des Betriebs sicher an seinem Platz zu halten.

    Caution: Excessive bolt torque can lead to sprocket/sheave and/or bushing breakage.
    Note: To ensure proper drive performance, it is recommended to achieve full bushing contact on the shaft.

    (8) When available, tighten the set screw to securely hold the key in place during operation.

    Bushing StyleSchrauben (in)Drehmomentschlüssel
    Menge.Größelb-ftlb-in
    H21/4×3/47.995
    JA310-24×14.554
    SH & SDS31/4-20×1 3/89.0108
    SD31/4-20×1 7/89.0108
    SK35/16-18×215.0180
    SF33/8-16×230.0360
    E31/2-13×2 3/460.0720
    F39/16-12×3 5/875.0900
    J45/8-11×4 1/2135.01620
    M43/4-10×6 3/4225.02700
    N47/8-9×8300.03600
    P41-8×9 1/2450.05400
    W41 1/8-7×11 1/2600.07200
    S51 1/4-7×15 1/2750.09000

    Tabelle 2 – Anzugsmomente für die Schrauben der QD-Buchse

    QD Bushing Remove:

    (1) Alle Befestigungsschrauben lösen und entfernen.

    (2) Setzen Sie die Kappenschrauben in alle Gewindebohrungen der Wagenheberschrauben ein.

    (3) Lösen Sie die Buchse, indem Sie zuerst die Schraube, die am weitesten vom Sägeschlitz der Buchse entfernt ist, festziehen und anschließend abwechselnd die übrigen Schrauben. Ziehen Sie die Schrauben in kleinen, gleichmäßigen Schritten weiter fest, bis sich das konische Kettenrad/die Riemenscheibe und die Buchse voneinander lösen.
    Hinweis: Zu hoher oder ungleichmäßiger Druck auf die Schrauben kann den Buchsenflansch beschädigen, wodurch eine Demontage ohne Zerstörung des Kettenrads/der Riemenscheibe unmöglich wird.

    QD Bushing Remove
    QD Bushing Remove

    QD Bushing FAQ

    How Does a QD Bushing Work?

    The bushing’s tapered design grips the shaft tightly when cap screws are torqued, pulling the component into place. The split flange ensures even clamping force, enabling secure mounting and easy disassembly without damaging the shaft or component.

    What Materials Are QD Bushings Made From?

    Typically crafted from steel, cast iron, or ductile iron, QD bushings withstand high loads and harsh environments. Some applications use stainless steel or composites for corrosion resistance, with material choice depending on load, environment, and cost considerations.

    What Sizes Are Available for QD Bushings?

    Quick detachable bushings (or QD) feature a flange on the outside diameter which is often used to secure the bushing to a sprocket or pulley. More distinctly, QD bushings also feature a split through the flange and taper which makes installation and removal much easier while also improving the holding power by tightening cap screws. QD bushing sizes include: JA, SD, SK, SF, SDS, SH, J, F, E, M, N, P, W, and S.

    What Is the Difference Between a Taper Lock and a QD Bushing?

    The key contrast is in their outer design: the QD style bushing sports a flange around the outer diameter, while the taper lock bushing boasts straight sides for flush mounting. Despite this, both rely on a tapered wedging action for shaft locking, often colloquially dubbed as “taper lock”.

    What Is the Difference Between QT and QD Bushings?

    A QT bushing is a particular size variant of the quick detachable bushing, notable for its reverse mounting configuration. Unlike typical QD bushings, QT variants lack a set screw over the key. Additional QD bushing sizes encompass SD, SK, J, F, E, SF, SDS, SH, and JA.

    What Maintenance Do QD Bushings Require?

    Regularly inspect for wear, corrosion, or deformation. Ensure screws are tightened to the correct torque and check for shaft alignment. Avoid lubricants during installation to prevent slippage, and replace worn bushings to maintain system efficiency and safety.
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