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Torque limiter
Torque limiter
Torque limiter
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from Wikipedia
A roller detent type torque limiter that uses springs to push rollers against a notched output plate

A torque limiter is an automatic device that protects mechanical equipment, or its work, from damage by mechanical overload. A torque limiter may limit the torque by slipping (as in a friction plate slip-clutch), or uncouple the load entirely (as in a shear pin). The action of a torque limiter is especially useful to limit any damage due to crash stops and jams.

Torque limiters may be packaged as a shaft coupling or as a hub for sprocket or sheave. A torque limiting device is also known as an overload clutch.

Disconnect types

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Disconnect types will uncouple the drive, with little or no residual torque making its way to the load. They may reset automatically or manually

Shear pin

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Main article: Shear pin

A shear pin type sacrifices a mechanical component, the pin, to disconnect the shafts. The use of shear pins as torque limiters has been well known since at least the early 20th century.[1]

Synchronous magnetic

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A synchronous magnetic torque limiter uses permanent magnets mounted to each shaft, with an air gap between. They are very fast acting, but may have more backlash than mechanical types. Because there is no mechanical contact between the two shafts, they are also used to transmit torque through a physical barrier like a thin plastic wall. On some models, the torque limit may be adjusted by changing the gap between the magnets.

Ball detent

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A ball detent type limiter transmits force through hardened balls which rest in detents on the shaft and are held in place with springs.[1] An over-torque condition pushes the balls out of their detents, thereby decoupling the shaft. It can have single or multiple detent positions, or a snap acting spring which requires a manual reset. There may be a compression adjustment to adjust the torque limit.

Many cordless drills incorporate this type of torque limiter in a planetary gearset. It may be a part of an assembly of multiple gearsets used to primarily reduce speed and multiply torque as well as perform ratio changes. The torque limiter is typically the last gearset in the transmission. It uses the planet carrier as the input with the sun gear as the output, and the annulus normally locked. A series of ball detents act on the annulus to lock it, allowing power to be transmitted from the planet carrier to the sun gear. When the torque transmitted through the gearset reaches a determinate amount, the torque acting on the annulus causes it to unlock from its ball detents and freely rotate, causing power to be diverted from the load on the sun gear to the annulus and thereby stalling the output until torque is reduced to an amount where the ball detents can lock the annulus again. This system equally limits torque in both directions of rotation and also works with the sun gear as the input. The compression of the ball detents (and therefore the amount of torque at which the limiter is utilized) is typically adjusted by means of a rotating collar accessible to the user which is indexed and held in place with its own separate ball detents.

Pawl and spring

[edit]

This mechanical type uses a spring to hold a drive pawl against a notch in the rotor. It may feature automatic or manual reset. A compression adjustment on the spring determines the torque limit.

Friction plate

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This type is similar to a friction plate clutch. Over-torque will cause the plates to slip. A simple example is found in a fixed-spool fishing reel, where the slipping torque is set by means of a large hand nut in order that the reel will turn and allow more line to unwind before the line breaks under the pull of a fish.

Magnetic particle

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A magnetic particle clutch can be used effectively as a torque limiter. The torque setting fairly approximates a linear relationship with the current passing through the windings, which can be statically or dynamically set depending on needs.

Magnetic hysteresis

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This type is non-synchronous in normal operation, so there is always some slippage.

See also

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References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Torque limiter

View on Grokipedia
from Grokipedia
A torque limiter is a mechanical device designed to protect systems and rotating machinery from damage caused by excessive , typically by slipping or disengaging when a predetermined torque threshold is exceeded. These devices, also known as overload clutches or slip clutches, transmit under normal operating conditions but interrupt power flow during overload events such as jams, shocks, or mechanical failures to prevent costly breakdowns. By limiting torque transmission, they safeguard components like motors, gearboxes, and conveyors, thereby minimizing downtime and maintenance expenses. The fundamental principle of operation for most torque limiters involves friction-based or mechanical mechanisms that allow controlled slippage. In friction disk models, is transmitted via compressed friction disks during standard loads; upon overload, the driven member slips relative to the driving member, and the system often resets automatically once the excess is removed. settings are adjustable, for example via spring tension in friction models or air pressure in pneumatic variants, enabling precise to specific machinery requirements, with limits ranging from low values in precision applications to high s in heavy industrial uses. This design ensures the device remains engaged without constant intervention, enhancing operational efficiency and safety. Torque limiters are categorized into several types based on their disengagement and reset mechanisms, broadly divided into disconnecting (which require manual or automatic reset) and non-disconnecting (slip-only) variants. Common applications span diverse industries, including , , , and , where torque limiters protect equipment in conveyors, shredders, generators, and servo systems from overloads. In automotive and , they prevent driveline damage during sudden loads, while in precision settings like textiles or , they ensure accurate torque control to avoid misalignment. Overall, their integration reduces repair costs, extends equipment lifespan, and supports compliance with safety standards by mitigating risks of mechanical overload.

Fundamentals

Definition and Purpose

A torque limiter is an automatic mechanical device designed to protect equipment or its workload from damage by interrupting or limiting the transmission of during overload conditions. It functions as a mechanism within systems, disengaging or slipping when exceeds a predetermined threshold to prevent in rotating components. The primary purpose of a limiter is to safeguard drivetrains, motors, and connected machinery from excessive spikes resulting from jams, blockages, or operational errors, thereby minimizing downtime, repair costs, and potential hazards to personnel. By acting as a "mechanical fuse," it dissipates overload energy without causing widespread system damage, allowing operations to resume quickly after the issue is resolved. Key characteristics of torque limiters include an adjustable torque threshold, which enables customization to specific application requirements, and automatic reset capabilities in certain designs that permit re-engagement without manual intervention once is cleared. These devices are typically integrated into elements such as shafts and couplings to ensure seamless incorporation into existing mechanical setups. Common examples of equipment protected by torque limiters include conveyors, pumps, mixers, and printing presses, where sudden overloads from material jams or process interruptions are frequent risks. , as the rotational analog of , underscores the need for such protection in these torque-intensive systems.

Historical Development

The development of torque limiters began with early mechanical overload protection ideas in the 19th century, where simple shear mechanisms were employed in industrial machinery during the Industrial Revolution to safeguard components like gears and shafts from excessive torque. These rudimentary devices, often using weak links or pins designed to fail under overload, represented the initial efforts to protect growing mechanized systems from damage, with shear pins as torque limiters well-documented since the early 20th century. A key milestone occurred in the mid-20th century, with the introduction of the first spring-loaded limiters in 1949 by Morse to overcome the limitations of brittle disconnect methods, such as shear pins, in the expanding field of and . Post-World War II advancements in the and introduced magnetic and particle-based limiters, exemplified by Jacob Rabinow's invention of the magnetic particle clutch in at the National Bureau of Standards, which enabled controlled slipping under overload for smoother operation. Companies like Zero-Max, founded in 1949, contributed to these developments by creating mechanical solutions tailored to the demands of manufacturing and automotive industries. From the 1970s onward, innovations focused on adjustable and resettable designs, such as Howdon Developments' founding in 1974 and their patented Wedgegard shearpin torque limiter in 1977, which improved reliability and ease of maintenance in high-torque applications. In the 2000s, torque limiters integrated digital monitoring for enhanced precision and compatibility with Industry 4.0 frameworks, allowing real-time data analysis and automated responses to overloads. These evolutions were driven by the proliferation of high-power machinery and adherence to safety standards, including ISO 13849-1, which mandates robust protective measures to minimize risks in mechanical systems.

Operating Principles

Torque Basics

, the rotational equivalent of linear , quantifies the tendency of a to cause about an axis. It is calculated as the magnitude of the of the position vector from the axis to the point of application and the vector itself, given by τ=F×r×sin⁡(θ)\tau = F \times r \times \sin(\theta), where τ\tau is the torque, FF is the applied , rr is the from the axis (lever arm), and θ\theta is the angle between the force vector and the lever arm. In engineering contexts, is measured in Newton-meters (N·m) in the (SI) or foot-pounds (ft-lb) in , with consistent application of these units essential to ensure accurate calculations and prevent errors in system design and analysis. in mechanical systems arises from sources such as electric , internal engines, or external loads like gravitational forces or frictional resistances; overload conditions emerge when the applied surpasses the system's design limits, often due to abrupt events such as sudden stops or material jams in machinery. Torque plays a central role in power transmission, where it is conveyed through components like shafts, gears, and couplings to drive machinery. Imbalances in torque distribution can induce excessive stress, vibrations, and eventual component failure, underscoring the need for protective devices like torque limiters to safeguard systems from overload damage.

Overload Detection and Response

Torque limiters employ several methods to detect excessive torque, ensuring timely intervention to protect mechanical systems from damage. Mechanical detection often involves monitoring deformation or engagement failure in components such as torque plates or ball-detent mechanisms, where overload causes displacement that activates a to signal the event. Friction-based detection relies on the relative slip between drive and driven elements when the applied torque surpasses the preset frictional force, allowing continuous monitoring without complete disengagement until necessary. Electromagnetic sensing, meanwhile, uses or electromagnets to detect torque spikes by measuring changes in or induced currents, providing precise and non-contact detection suitable for high-speed applications. Upon detecting an overload, torque limiters initiate protective responses that either abruptly disconnect the power transmission or allow controlled slippage to mitigate the excess load. Disconnection mechanisms, such as those using shear pins or ball-detent systems, halt transfer immediately by separating the input and output shafts, preventing further stress on downstream components. In contrast, slip-based responses enable gradual reduction through friction or , maintaining partial transmission at a safe level until the overload subsides. Reset processes vary, with automatic re-engagement occurring once the overload is removed in slip designs, while disconnection types may require manual intervention or remote signaling for safety. Threshold settings in torque limiters are adjustable to align with specific , typically via mechanical elements like springs or disc springs that control preload, magnetic fields for hysteresis-based limits, or electronic controls for dynamic . Incorporating —often achieved through magnetic or frictional —is crucial to prevent oscillatory "chatter" during marginal overloads, ensuring stable operation by introducing a small differential between activation and reset torques. Modern torque limiters frequently integrate safety features such as alarms or shutdown signals, where proximity sensors or limit switches detect the overload event and relay it to control systems for automated responses like emergency stops. These integrations enhance overall system reliability by enabling operator notification and preventing secondary failures from prolonged overload exposure.

Types

Disconnect Torque Limiters

Disconnect torque limiters are mechanical safety devices designed to physically interrupt by separating the input and output shafts when the torque exceeds a predetermined threshold, acting as a mechanism to protect machinery from overload damage. This disconnection typically requires manual intervention for reset, making these limiters particularly suitable for applications involving high torque loads and infrequent overload events, where complete cessation of operation is preferable to continued partial transmission. Unlike slip-based alternatives that permit ongoing operation through controlled slippage, disconnect types ensure absolute isolation to eliminate inertial forces in the . One common implementation is the shear pin mechanism, which functions as a deliberate weak link in the drive system; the pin, often made from materials like or calibrated to shear at a specific level, fractures under overload to break the connection between components. This design offers simplicity and low cost, ideal for basic overload protection in rugged environments, though it necessitates pin replacement after each activation to restore functionality. In ball detent configurations, a series of balls or rollers seated in detents on mating rotating bodies are held in place by disc springs or similar preload mechanisms during normal operation; upon overload, the applied overcomes the spring preload, causing the balls to disengage from their seats and rapidly decouple the shafts. These limiters provide quick manual reset capabilities and high precision, with thresholds adjustable to within ±5% accuracy, making them well-suited for precision equipment where is essential. Pawl and spring mechanisms operate on a ratchet principle, where a spring-loaded pawl engages notches on a rotor to transmit ; overload compresses the spring, allowing the pawl to slip or fully disengage, interrupting the drive. This type supports either automatic or manual reset and is commonly employed in low-speed scenarios, such as hoist systems, to safeguard against sudden jams or excessive loads. Synchronous magnetic disconnect limiters utilize arrays of permanent magnets on opposing shafts separated by an air gap, enabling torque transfer through without physical contact until overload causes misalignment and decoupling. They offer precise, repeatable disconnection with no wear on components, rendering them ideal for or hygienic environments where contamination must be avoided. The primary advantages of disconnect torque limiters include their ability to provide an immediate and complete halt to power flow, thereby preventing escalation of damage from overloads and dissipating inertial energy effectively. Additionally, they incur no energy losses or heat generation during standard operation, enhancing overall system efficiency compared to friction-dependent designs.

Slip Torque Limiters

Slip torque limiters function by allowing controlled slipping at a preset threshold, thereby capping transmission without fully disconnecting the drive , which enables the machinery to continue operating at a reduced capacity or idle until the overload is resolved. This automatic resettability makes them particularly suitable for applications involving dynamic or variable loads, where abrupt stops could cause further issues. One common variant is the friction plate torque limiter, which operates like a with multiple plates pressed together by adjustable spring pressure or other mechanisms to transmit through . When overload occurs, the plates slip relative to each other, limiting to the set value calculated as T=23μFro3−ri3ro2−ri2T = \frac{2}{3} \mu F \frac{r_o^3 - r_i^3}{r_o^2 - r_i^2} , where μ\mu is the , FF is the normal , and ror_o and rir_i are the outer and inner radii. These devices are wear-based due to frictional contact and are often employed in high-power drive systems, such as conveyor belts in industrial settings, where they protect against jams while maintaining operational continuity. Magnetic particle torque limiters use a bed of ferromagnetic powder particles suspended in a fluid between input and output members, where an electromagnetic field magnetizes the particles to form transient chains that transmit torque. Under overload, these chains shear, allowing smooth slipping with torque proportional to the shear stress times the effective area, typically around 10 kPa at a magnetic field strength of 1 T. This design provides adjustable torque settings and minimal wear, as there is no direct mechanical contact, making it ideal for applications requiring consistent performance over extended periods. In magnetic hysteresis torque limiters, torque is transmitted through asynchronous magnetic drag between a rotating permanent magnet assembly and a stationary or counter-rotating ferromagnetic hysteresis disc, creating a hysteresis loop that maintains a constant up to the slip point. The can be expressed as T=pVBH2T = \frac{p V B H}{2}, with pp as the pole pair number, VV the volume, BB the magnetic flux density, and HH the magnetic field strength. Lacking physical contact, these offer precise control with low , suiting them for variable-speed operations where smooth and repeatable limiting is essential. Other variants include emerging centrifugal slip mechanisms, which utilize on rotating weights or shoes to engage or slip at high speeds, finding niche use in specialized high-speed drives. A key drawback of slip torque limiters is the potential for heat generation and material wear during prolonged slipping, particularly in friction-based designs operating at high speeds, which can reduce lifespan if not managed through cooling or limited slip duration.

Applications

Industrial Applications

Torque limiters play a critical role in industrial manufacturing by safeguarding conveyor systems from jams or blockages, preventing motor burnout in processes like where consistent material flow is essential. For instance, in packaging lines, these devices disengage upon detecting excessive torque, allowing quick resets without extensive repairs. In heavy machinery such as cranes and winders, torque limiters integrate to handle sudden loads, with variants commonly used for one-time overload protection in extruders during plastic processing. This setup ensures that a mechanical failure, like a jammed die, shears the pin rather than damaging the or gearbox. The adoption of torque limiters has contributed to reduced unplanned in 24/7 operations, as seen in equipment where they prevent shaft failures from rock jams, extending equipment life according to industry analyses. Sector-specific implementations include precise control in printing presses to avoid web breaks and in chemical plants for in hazardous environments, where overload disconnection minimizes risks from agitator blockages. Post-2000s trends have driven increased usage for enhanced equipment longevity in automated factories.

Automotive and Transportation

In automotive drivetrains, torque limiters protect against overloads from sudden high-torque demands, such as in off-road trucks navigating uneven to prevent driveline stress. In heavy applications such as rail cars, buses, and , torque limiters protect axles from overloads during or load shifts, with -based designs favored for their ability to deliver smooth, controlled power without abrupt disconnection. Voith's SafeSet couplings, for example, slip at preset levels to isolate driveline components in rail gear units, ensuring reliable operation under dynamic loads. These mechanisms allow gradual modulation, reducing shock to axles in navigating uneven fields or buses handling passenger weight variations. Since the 2010s, electric vehicles (EVs) have increasingly incorporated electronic torque limiters within motor control units to protect batteries and motors from overloads, using real-time algorithms to cap torque output during rapid acceleration or regenerative braking. These systems monitor current draw and adjust torque dynamically, preventing thermal runaway in batteries while maintaining drivability. As of 2025, the electronic torque limiter market is projected to grow from USD 693.4 million to USD 1,200 million by 2035, driven by EV adoption. In commercial trucks, magnetic torque limiters are employed to avert driveline damage during towing under excessive loads. Similarly, in aviation ground equipment like engine installation trailers, torque limiters such as Formsprag's clutches shield against high-force overloads during aircraft handling. Torque management in these fleets often aligns with standards, which define parameters like engine torque limit requests (SPN 1787) to ensure compliant overload protection across heavy-duty vehicles. Disconnect-type torque limiters may be briefly referenced here for heavy-duty stops, where they fully disengage to halt power flow abruptly.

Advantages and Limitations

Benefits

Torque limiters provide essential protection for mechanical systems by disengaging or slipping when torque exceeds preset limits, thereby preventing catastrophic failures such as gear stripping, shaft breakage, or motor burnout in overload conditions. This mechanism significantly extends the service life of components by reducing wear and tear from excessive loads, allowing machinery to operate reliably over extended periods without premature degradation. By averting severe damage during overload events, torque limiters deliver substantial cost savings through minimized repair expenses and reduced , with the initial often recouped via avoided production losses and the prevention of expensive component replacements, such as that can cost thousands of dollars to repair or replace in industrial environments. Torque limiters enhance by isolating drive components during overloads, thereby minimizing hazards like flying from fractured parts or uncontrolled sudden stops that could endanger operators. Their supports compliance with key regulations, including OSHA standards for and ISO guidelines for machinery , ensuring controlled transmission to mitigate accident risks. In terms of , torque limiters enable rapid recovery after an overload event without necessitating a complete system shutdown, as they allow for quick re-engagement once the issue is resolved. Adjustable torque settings in many designs further optimize performance by tailoring protection to specific operational demands, maintaining smooth under normal conditions while responding precisely to anomalies. The versatility of torque limiters makes them suitable for a broad spectrum of applications, accommodating power levels from fractional horsepower systems to high-torque setups exceeding thousands of Nm, thus providing adaptable overload protection across diverse mechanical configurations.

Drawbacks

Torque limiters, while effective for overload protection, present several inherent drawbacks that can impact their practicality in certain applications. One significant limitation is the requirements, particularly for slip-type torque limiters that rely on mechanisms. These devices experience on components such as friction plates or discs during operation, especially under high-speed overload conditions, necessitating periodic and adjustment to maintain settings. For instance, limiters may require regular involving of surfaces and potential replacement of worn parts to prevent slippage at unintended levels. Cost factors also pose challenges, as torque limiters generally incur higher initial expenses compared to basic mechanical couplings due to their specialized for overload protection. Custom configurations, such as those tailored for specific torque ranges or integration with existing drivetrains, further increase complexity and pricing, making them less economical for low-risk or budget-constrained setups. Magnetic torque limiters, in particular, are noted for their elevated costs, often restricting their use to applications with lower demands where non-contact operation justifies the investment. Performance limitations can arise in dynamic operating environments, including the potential for false tripping under variable loads where transient spikes mimic overloads, leading to unnecessary disengagement. In slip torque limiters, prolonged slipping generates heat buildup, calculated as watts of heat dissipation based on , RPM, and (e.g., Watts = (inch-pounds) × RPM × × 0.011), which can degrade and accelerate wear if not managed. This effect may reduce overall during repeated overload events, though exact losses depend on operational parameters. Reset issues are prominent in disconnect-type torque limiters, such as ball detent or models, which fully disengage upon overload and often require manual intervention to reposition components like springs or replace shear elements, resulting in operational delays. This makes them less suitable for fully automated systems where immediate recovery is essential, as re-engagement can interrupt production cycles. variants, for example, demand pin replacement after each event, adding to downtime and logistical burdens. Environmental sensitivities further limit applicability, especially for magnetic torque limiters, which can be affected by dust accumulation or ferromagnetic contaminants that alter and torque transmission. Temperature extremes also constrain performance; operating ranges vary by model, typically from -40°C to 70–150°C, but exposure beyond a device's specified limits may cause demagnetization or inconsistent slipping, reducing reliability in harsh industrial settings.

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