Questions and Answers
Chain drives operate in __
tension
__ on the driving sprocket engage with and pull chain link
teeth
Standard single strand roller chain contains __ that pivot inside __
pins; bushings
What is a strand of a roller chain?
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The larger the pitch, the __ number of links and the __ the load rating.
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A __ pitch chain carries less load and provides quieter operation.
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__ keep connecting link plates from working loose.
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Standard strands of chain have an __ number of pitches and an __ number of pin links and roller links.
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A __ is a combo of a roller link and a pin link.
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Standard roller chain is available with pitches from __ to __.
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Chain drives are available with __ inch and __ inch pitches but with roller-less construction.
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A 60-4 chain denotes a __ strand.
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Sprockets for double pitch roller chain have __ teeth per link rather than __ teeth per link.
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The type of lubrication employed in a chain drive may be the sole limiting factor in deterring the __ capacity.
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__ lubrication uses a pump to force oil onto the chain and joints.
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Speed ratios should not exceed __ in a single reduction for roller or silent chains.
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For most power applications, ratings for chain drives are based on a life of __ hours.
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Chain drives lubricated manually operate most of the time with __.
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__ allow chain to act as a conveyor.
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Double pitch conveyor chain conforms to __.
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__ roller chains require no maintenance during their life.
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The most common type of self-lube roller chain contains special powdered metals which contain __.
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__ are designed to carry greater loads & withstand greater shock loads than standard series roller chains.
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__ chains are capable of flexing around curves or twisting 90 degrees.
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__ chains may be used with standard roller chain sprockets.
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Corrosion resistant carbon steel chains are coated to resist corrosion but sacrifice __ as a result and have lower load ratings.
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The distance between flexing joints in a roller chain is the __.
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A number 40 chain has a pitch of __.
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Extended pitch chain is also known as __.
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Corrosion resistant chain includes?
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SC1012 indicates a silent chain of __.
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The type of chain lubrication that routes the chain through a shallow pool of oil is __.
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Standard single strand roller chain is made up of __.
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The advantageous characteristics of chain drives include __.
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Highly corrosive environments for chains most likely occur in __.
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Double pitch conveyor chain conforms to __.
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Leaf chains are often used in the following applications: __.
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Sticker chains are designed to be used in which of the following industries: __.
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Free flow chains can be used to __.
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ANSI publishes standards for chains/sprockets. What do these standards cover: __.
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Study Notes
Chain Drives Overview
- Chain drives operate under tension for effective power transmission.
- Driving sprocket teeth engage with chain links to transfer motion.
Chain Structure and Components
- Standard single strand roller chains consist of pins that pivot inside bushings.
- A roller chain strand combines alternating pin links and roller links.
- An offset link combines a roller link with a pin link for specific applications.
Chain Specifications
- Larger pitch results in a smaller number of links but a higher load rating.
- Standard roller chains are available with pitches ranging from 1/4" to 3".
- A number 60-4 chain represents a quadruple strand configuration.
- Sprockets for double pitch roller chains have 2 teeth per link, compared to 1 for standard chains.
Lubrication and Maintenance
- The type of lubrication can limit the horsepower capacity of chain drives.
- Type C lubrication employs pumps for consistent oil delivery to chains and joints.
- Manual lubrication often leads to either excessive or insufficient lubrication levels.
Performance and Lifespan
- Chain drive speed ratios should not exceed 10:1 in single reductions.
- Power rating for chain drives is based on a life expectancy of 15,000 hours.
- Self-lubricated roller chains require no maintenance throughout their operational life.
Chain Types and Applications
- Double pitch conveyor chains adhere to ASME B29.3 standards.
- Super series roller chains are designed for higher loads and greater shock resistance.
- Side bow chains can flex around curves or twist at 90 degrees.
- Leaf chains are specifically used in lifting applications.
- Sticker chains find use in thermoforming processes.
Corrosion Resistance and Durability
- Corrosion-resistant carbon steel chains are treated to resist corrosion but have lower load ratings due to reduced load capacity.
- Corrosion-resistant chains include materials such as stainless steel, nickel-plated steel, and zinc-nickel coatings.
Chain Length and Flexibility
- The distance between flexing joints in a roller chain is referred to as pitch length.
- Extended pitch chains are also known as double pitch drive chains.
Standards and Compliance
- ANSI and ASME publish standards for chain and sprocket specifications that cover various performance criteria.
- Chain drives have unlimited shelf life, making them a reliable choice for long-term applications.
Unique Chain Features
- Free flow chains promote the conveying and accumulating of products, allowing for faster transportation than chain speed.
- Specialized chains, such as those for thermoforming, cater to specific industry requirements.
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Description
This quiz explores the fundamentals of chain drives, including their structure, components, and specifications. It covers the operation of roller chains, the importance of lubrication, and how pitch affects load ratings. Test your knowledge on these crucial mechanical systems.
