Sprag Mechanical Clutches
Description
Sprag mechanical clutches are devices designed to transmit torque between two rotating components. They utilize steel wedges, known as sprags, to engage and disengage the clutch mechanism, allowing for the controlled transfer of rotational force.
Working Principle
Sprag clutches operate by using steel wedges that tip in one direction to wedge between the inner and outer races. This engagement allows the clutch to transmit torque effectively. When the torque exceeds a certain threshold, the sprags tip excessively, causing the contact to be lost and preventing further torque transmission. This mechanism is particularly useful because it allows for high torque transmission compared to other designs of slip or overrunning clutches .
Applications
Sprag mechanical clutches are commonly used in applications where unidirectional torque transmission is required. Specific examples include their use in conveyor systems to prevent reverse motion, in automotive transmissions for smooth gear shifting, and in various industrial machinery where controlled torque transmission is critical.
Advantages over other Mechanical Clutches
Sprag clutches often have the advantage of transmitting more torque than other designs of slip or overrunning clutches. This makes them particularly suitable for applications requiring high torque capacity and reliability .
Limitations
One limitation of sprag clutches is that they can lose contact if the torque exceeds the designed threshold, which can lead to a failure in torque transmission. This characteristic requires careful consideration during the design and selection process to ensure that the clutch is suitable for the intended application .
Considerations
When considering the use of sprag mechanical clutches, it is important to evaluate factors such as initial costs, operating expenses, and maintenance requirements. Sprag clutches may have higher initial costs due to their design and material requirements. However, their durability and high torque capacity can offset these costs over time. Regular maintenance is necessary to ensure their longevity and performance, and replacement costs should be factored into the overall operational budget.
from Hilliard Corporation (The)
Hilliard Sprag Clutches are designed for overrunning, backstopping and indexing applications. This clutch is a freewheeling device with an inner race and an outer race, either of which can be the input or output member. The input can drive the output in a chosen direction and permit the output to... [See More]
- Engagement: Roller Detent; Sprag
- Rotary Speed: 375 to 3600
- Torque: 275.0 to 36600.0
- Special: Overrunning; Freewheeling; Backstop
from Renold Canada
DM series direct mounting sprag clutches are specifically designed for use as backstops in applications where. compact dimensions are required. The clutch is designed to fit in a housing with the shaft as the inner race. This type is particularly suitable for use in gear units and similar equipment... [See More]
- Engagement: Sprag
- Rotary Speed: 1800
- Torque: 2520.0
- Spring Assistance: Spring Actuation/Engage
from GMN Bearing, USA Ltd.
GMN insert element with meander shaped spring, high speed, high accuracy [See More]
- Engagement: Sprag
- Rotary Speed: 10000
- Torque: 0.2
- Special: Freewheeling
from Renold Canada
Stub shaft adaptors for use with SO and SX sprag clutches providing a mounting stub shaft for mechanical elements such as chainwheels, couplings, gears, pulleys, cams, levers, etc, when the size or configuration of these parts does not allow bolting holes to be drilled to match the existing tapped... [See More]
- Engagement: Sprag
- Spring Assistance: Spring Actuation/Engage
- Torque: 27000.0
- Shaft: In-line
from Renold Canada
The SA Series clutch is a light duty product with plain bearings. Features. Suitable for all small machine applications where compact dimensions are required. Grease lubricated and sealed for life, offering reliability with maintenance-free duty. Dimensional interchangeability with other leading... [See More]
- Engagement: Sprag
- Rotary Speed: 3450
- Torque: 30.0
- Spring Assistance: Spring Actuation/Engage
from Renold Canada
A general purpose clutch suitable for most general light to medium duty applications. Features: Extended spigot at one side to allow direct mounting of chain pinions gears, index arms etc - design flexibility. Sleeve bearing inside the extended spigot - greater strength. Dimensionally identical to... [See More]
- Engagement: Sprag
- Rotary Speed: 1950
- Torque: 1600.0
- Spring Assistance: Spring Actuation/Engage
from Renold Canada
A medium to large power capacity sprag clutch and flexible coupling combination range. Features. SO series clutch combined with Pinflex coupling allowing for angular, parallel and axial misalignment. Absorbs vibration and shock loads. SO series clutch with two flexible half Gearflex couplings... [See More]
- Engagement: Sprag
- Rotary Speed: 3600
- Torque: 7120.0
- Spring Assistance: Spring Actuation/Engage
from Renold Canada
A high precision, clutch suitable for medium to heavy duty applications. Features. All clutches are fitted with high precision heavy duty bearings for arduous duty applications. Clutch sizes 300 to 700 are fitted with ARO sprags to resist vibration and high transient torques and overloads. SO series... [See More]
- Engagement: Sprag
- Rotary Speed: 3600
- Torque: 27000.0
- Spring Assistance: Spring Actuation/Engage