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Tsubaki Advantage
Cam Clutch Solutions
Tsubaki engineers have spent five decades designing and improving upon unidirectional and mechanical clutches to enhance their reliability and performance. The result is Tsubaki’s line of Cam Clutch solutions, complete with innovative features to ensure reliable operation in harsh environments.Backstop Cam Clutches
In backstopping applications, clutches are used to prevent reverse rotation of drive shafts, which may cause damage to expensive machinery and equipment. Tsubaki pioneered the non-rollover design in its clutches, which means that even if an unexpectedly large reverse torque occurs, the clutches will not roll over. Typical backstop applications are in conveyor systems and gear reducers.The company carries several lines of clutches designed for backstopping applications, including its BR-HT Series, BREU Series, BS/BS-HS Series, BSEU Series and TXT/CA Series.Indexing Clutches
In indexing applications, reciprocating motion applied to the clutch transforms into one-direction motion. A crank mechanism on Tsubaki’s design provides reciprocating motion to drive the Cam Clutch, which then drives in the forward stroke and overruns on the return stroke, indexing the feeding roller forward.Tsubaki carries several solutions for indexing applications, including its MIUS Series, MZ Series and MZEU Series.Overrunning Clutches
In overrunning applications, the clutches spin freely the majority of the time, though they are sometimes required to lock up and drive. Typical applications include a two-speed drive, where the machine is driven by either an electric motor or geared motor. When the gear motor drives at low speed, the clutch engages. At higher speeds, the clutch overruns, automatically switching between low and high speeds.The company’s portfolio of Overrunning Cam Clutches includes its BB Series, BUS 200 Series, MGUS/R Series, OB-ON/OF Series, OB-SF Series, PBUS Series, TFS Series and TSS Series.All Cam Clutch products from Tsubaki are available in a variety of bore sizes and torque capacities for each application’s unique needs.
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Cost Savings
Cost Effective, Not Costly
The customer’s waste-to-energy plant facility provides dependable, environmentally safe disposal of municipal solid waste for 290,000 residents, while generating clean, renewable electricity for sale to the local utility.ISSUE:
The conveyor that transports fly ash (by-product from the incinerated residential and commercial waste) was having trouble with the competitor’s backstop on the head shaft, where the unit was leaking oil. There was a concern it would fail without notice and cause an unplanned stop to the operation.SOLUTION:
Tsubaki engineering reviewed the application, confirmed the motor horsepower and conveyor speed and recommended our BS160HS with the I-beam torque arm. Because of the need to avoid a sudden breakdown, the key factor was the speed of delivery – the product was received after 9 days of drawing approval and installed as a drop in and has been operating smoothly. The customer avoided a potential downtime situation.
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Tech Time
Backstop Size Selection for Conveyor Drive Applications
By Nick KonoBackstop Mounting Arrangements
Backstops are most commonly used to prevent reverse rotation of an inclined or vertical conveyor systems. Many configurations of conveyor systems that employ backstops are available. Most common types and calculation examples will be presented in this article to properly size the backstop in order to maximize performance and improve safety of the conveyor.
Single and Dual DrivesFor low speed overrunning applications, backstops are installed directly on the extended head shaft, as shown in Figure 1 and 2. Tsubaki recommends single installation of the backstop to prevent reverse rotation of head shaft.Tandem DrivesWhen the conveyor arrangement calls for a primary and secondary drive, as shown in Figure 3, the Backstop on the primary drive unit holds the full load. The Backstop on the secondary drive unit holds the back tension from the belt keeping belt traction on both conveyor systems.Tsubaki recommends that the Backstop have the torque capacity that is equal to the sum of the primary and secondary motors be installed on the primary unit drive. The Backstop on the secondary drive unit should be sized from the secondary drive motor only.Backstop Size SelectionService FactorBackstops by definition are required to hold back a load from moving in a reverse direction. Care must be taken in calculating the torque requirements and should be based on maximum or worst case conditions and not average/normal loads. Because any failure of a backstop might result in costly damages or injuries, care must be exercised by considering all the possible loads and in turn selecting appropriate service factors. The Backstop needs to be sized for the breakdown or stalled torque of the drive motors. The following table shows typical service factors that should be applied when sizing for backstops.Motor Stalled Torque = Motor maximum torque experienced with no shaft rotationMaximum Stalled Torque or Breakdown
Torque % of Normal Motor Rating
Service Factor 175% 1.17 200% 1.33 250% 1.67 300% 2.00 Load SharingBackstops have no backlash, therefore, two backstops can theoretically share 50% of the total calculated torque. However, we have to consider “load sharing factors”.Dual Drive ApplicationIn a dual drive application with a single head shaft, if the required backstop capacity is in excess of the listed capacity in the catalogue, a twin arrangement of Backstop Cam Clutch is the solution, as shown in Figure 4. And we have to consider “load sharing factor”NOTE: In this usage, load sharing factor becomes 1.7 for two Backstop Cam Clutches, not 2.Examples of Backstop Size SelectionExample No. 1: Single Drive / Single BackstopApplication Information:Drive motor – 125HPHead shaft – 43.75 RPMShaft Dia. – 6.00”250% stalled torque motor – 1.67 SFSelection:125 HP x 5250 x 1.67 SF / 43.75 RPM = 25,050 ft. lbs.Backstop size = BS160HS (Bore range: 3.94” to 6.25”)Torque capacity BS160HS = 28,912 ft. lbs. > 25,050 ft. lbs.Example No. 2: Dual Drive / Single BackstopApplication Information:Drive motor – 2 x 400 HPHead shaft – 29.17 RPMShaft Dia. – 11.25”200% stalled torque motor – 1.33 SFSelection:2 x 400 HP x 5250 x 1.33 SF / 29.17 RPM = 191, 498 ft. lbs.Backstop size = BS300HS (Bore range: 9.00” to 11.75”)Torque capacity of BS300HS = 216,843 ft. lbs. > 191,498 ft. lbs.Example No. 3: Dual Drive / Dual BackstopApplication Information:Drive motor – 2 x 1000HPHead shaft – 31.82 RPMShaft Dia. – 13.5”200% stalled torque motor – 1.33 SFSelection:2 x 1000 HP x 5250 x 1.33 SF / 31.82 RPM = 438,875 ft. lbs.Correction torque = 438,875 / 1.7 = 258,162 ft. lbs.Backstop size = BS350HS x 2 pcs (Bore range: 9.88” to 13.73”)Torque capacity of BS350HS = 289,124 ft. lbs. > 258,162 ft. lbs.Example No. 4: Tandem Drive / Tandem BackstopApplication Information:Primary drive motor – 750 HPSecondary drive motor – 750 HPHead shaft – 38.89 RPM200% stalled torque motor – 1.33 SFSelection (Primary Backstop):2 x 750 HP x 5250 x 1.33 SF / 38.89 RPM = 269,317 ft. lbs.Backstop size = BS350HS (Bore range: 9.88” to 13.73”)Torque capacity of BS350HS = 289,124 ft. lbs. > 269,317 ft. lbs.Selection (Secondary Backstop):750 HP x 5250 x 1.33 SF / 38.89 RPM = 134, 658 ft. lbs.Backstop size = BS270HS (Bore range: 7.875” to 10.625”)Torque capacity of BS270HS = 150,462 ft. lbs. > 134,658 ft. lbs.Example No. 5: Dual Tandem Drive / Dual Tandem BackstopApplication Information:Primary drive motor – 2 x 1500 HPSecondary drive motor – 2 x 1500 HPHead shaft – 35 RPM150% stalled torque motor – 1.17 SFSelection (Primary Backstop):4 x 1500 HP x 5250 x 1.17 SF / 35 RPM = 1,053,000 ft. lbs.Correction torque = 1,053,000 / 1.7 = 619,412 ft. lbs.Backstop size = BS450HS x 2 (Bore range: 13.75” to 17.625”)Torque capacity of BS450HS = 722,809 ft. lbs. > 619,412 ft. lbs.Selection (Secondary Backstop):2 x1500 HP x 5250 x 1.17 SF / 35 RPM = 526,500 ft. lbs.Backstop size = BS425HS (Bore range: 12.75” to 16.625”)Torque capacity of BS425HS = 542,107 ft. lbs. > 526,500 ft. lbs.
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On the Move Newsletter!
The latest information on
Tsubaki innovation and
technical data! Click here >>
Issue 39
- Tsubaki News: Tsubaki Advantage offers web-based equipment management
- Cost Savings Highlight: Solve your Robot Issues with Tsubaki’s Robotrax
- Tech Time: Next Generation Tsubaki Leaf Chains
Issue 38
- Tsubaki News: Tsubaki Pin Gear Drive Unit Replaces Gear Rack Systems
- Cost Savings Highlight: Pin Gear Drive Units Nomenclature
- Tech Time: Pin Gear Drive Selection Procedure
Issue 37
- Tsubaki News: Pony Series Steel Bushed Chains – Elevator Chains
- Cost Savings Highlight: Roof Truss Press
- Tech Time:Tsubaki’s Products Add Value to Your Operation
Issue 36
- Tsubaki News: Engineering Chain - Elevator Types & Buckets
- Cost Savings Highlight:One-Touch Inspection Door® gives you easy access to your conveyors
- Tech Time: Roller Chain and Sprockets Troubleshooting Guide - Pin Related Issues
Issue 35
- Tsubaki News: G8 Series Heavy Duty Chains and Sprockets
- Cost Savings Highlight:Combat High Speed and Accelerated Elongation with Tsubaki’s Titan Chain
- Tech Time: Roller Chain and Sprockets Troubleshooting Guide – Link Plate Related Issues
Issue 34
- Tsubaki News: Bulk Material Handling Assemblies
- Cost Savings Highlight: Overhead Gantry Crane
- Tech Time: Roller Chain and Sprockets Troubleshooting Guide
Issue 33
- Tsubaki News: Asphalt Chain
- Cost Savings Highlight: Sawmill 90-Degree Conveyor
- Tech Time: How to Minimize Mechanical Wear on Chains
Issue 32
- Tsubaki News: Scan & Plan
- Cost Savings Highlight: Cam Clutch
- Tech Time: Custom Sprocket Capabilities
Issue 31
- Tsubaki News: Tsubaki Chain Configurator
- Cost Savings Highlight: Super Stainless Chain
- Tech Time: Super Stainless Sprockets
Issue 30
- Tsubaki News: Introducing Super Stainless Steel Chain
- Cost Savings Highlight: Workhorse Elevator Chains
- Tech Time: Chains for Asphalt and Paving Industry
Issue 29
- Tsubaki News: Where It All Began
- Cost Savings Highlight: Bushings for Sprockets
- Tech Time: Varitrak S/SX Series
Issue 28
- Tsubaki News: Energy Series for Cold Harsh Environments
- Cost Savings Highlight: Energy Series Sprockets
- Tech Time: Extended Travel Support Systems
Issue 27
- Tsubaki News: Automotive Parts
- Cost Savings Highlight: 4 Reasons to Use Tsubaki Advantage
- Tech Time: Importance of Strain Relief
Issue 26
- Tsubaki News: Power Transmission Video
- Cost Savings Highlight: Introducing STAGE-1
- Tech Time: Solutions to Harsh Environments
Issue 25
- Tsubaki News: G8 Series Intro
- Cost Savings Highlight: G8 Neptune & G8 Lambda
- Tech Time: G8 Heavy Duty Drive Chain
Issue 24
- Tsubaki News: G8 Series Drive Chain
- Cost Savings Highlight: Chain Inspection
- Tech Time: Diasaw Website
Issue 23
- Tsubaki News: Hardened Sprockets
- Cost Savings Highlight: Stone Elevator Sprocket with Wear Indicator
- Tech Time: SMART TOOTH™ Sprockets
Issue 22
- Tsubaki News: 100 Years Video
- Cost Savings Highlight: Power-Lock
- Tech Time: Power-Lock Selection Guide
Issue 21
- Tsubaki News: Cam Clutch Solutions
- Cost Savings Highlight: Cost Effective, Not Costly
- Tech Time: Backstop Size Selection
Issue 20
- Tsubaki News: Titan Series Chains
- Cost Savings Highlight: Rotary Drum Furnace
- Tech Time: Not All Chains Are Created Equal Part 4 - Corrosion
Issue 19
- Tsubaki News: Heavy Duty and Super Series Chains
- Cost Savings Highlight: Chain Failure
- Tech Time: Not All Chains Are Created Equal Part 3 - Tensile & Fatigue Failure
Issue 18
- Tsubaki News: Engineered Class Chain in Harsh Environment
- Cost Savings Highlight: SJ3 Sealed Chain Design
- Tech Time: Tsubaki WORKHORSE Elevator Chain
Issue 17
- Tsubaki News: Smart Tooth Sprockets
- Cost Savings Highlight: Incline Chip Conveyor
- Tech Time: Not All Chains Are Created Equal Part 2 - Mechanical Wear
Issue 16
- Tsubaki News: On the Move
- Cost Savings Highlight: Synthetic Gypsum Bucket Elevator
- Tech Time: Not All Chains Are Created Equal
Issue 15
- Tsubaki News: Scan And Plan
- Cost Savings Highlight: Edger Drive
- Tech Time: Using old sprockets with new chain
Issue 14
- Tsubaki News: More Innovation from Tsubaki!
- Cost Savings Highlight: Looper Exit
- Tech Time: Matching and Tagging: High Accuracy, Narrow Tolerance
Issue 13
- Tsubaki News: LAUNCH OF TSUBAKI OF CANADA'S SITE FOR KABELSCHLEPP
- Cost Savings: Debarker Drive
- Tech Time: To Idle or not to Idle, and where to put it
Issue 12
- Tsubaki News: Tsubaki KabelSchlepp’s New TKA Series Cable & Hose Carriers
- Cost Savings: Edger Infeed Table
- Tech Time: Choosing the right chain for the job at hand
Issue 11
- Tsubaki News: BLUE THUNDER IS COMING!
- Cost Savings: Smart Gates/ Spreader Chains
- Tech Time: Flame vs. Induction Hardening
Issue 10
- Tsubaki News: Tsubaki Advantage Power Play Contest
- Cost Savings: Chocolate Forming Line
- Tech Time: Choosing the Correct Attachment Chain For the Job At Hand
Issue 9
Issue 8
- Tsubaki News: Meet New President Kevin Powers
- Cost Savings: Sawmill Optimizer
- Tech Time: Tsubaki Super Chain
Issue 7
- Tsubaki News: Discover your Tsubaki Advantage
- Cost Savings: Sorter Drive
- Tech Time: Sprocket Wear Indicators
Issue 6
- Tsubaki News: Discover Your Advantage with Tsubaki's Engineered Chain
- Cost Savings Highlight: Lumber Planer Mill
- Tech Time: There’s an app for that.........
Issue 5
- Tsubaki News: Kabelschlepp Division
- Product Focus: Conduflex
- Selecting the Proper Carrier Bend Radius & Mounting Height for Cables & Hose Carriers
Issue 4
Issue 3
- Tsubaki News – Tsubaki of Canada Limited achieves ISO 14001 accreditation
- Gypsum Plant
- Pitch Line Clearance
Issue 2
Issue 1
Tsubaki Advantage
- Tsubaki News: Scan & Plan
- Tsubaki News: Tsubaki Chain Configurator
- Tsubaki News: Introducing Super Stainless Steel Chain
- Tsubaki News: Where It All Began
- Tsubaki News: Energy Series for Cold Harsh Environments
- Tsubaki News: Automotive Parts
- Tsubaki News: Power Transmission Video
- Tsubaki News: G8 Series Intro
- Tsubaki News: G8 Series Drive Chain
- Tsubaki News: Hardened Sprockets
- Tsubaki News: 100 Years Video
- Tsubaki News: Cam Clutch Solutions
- Tsubaki News: Titan Series Chains
- Tsubaki News: Heavy Duty and Super Series Chains
- Tsubaki News: Engineered Class Chain in Harsh Environments
- Tsubaki News: Smart Tooth Sprockets
- Tsubaki News: On the Move
- Tsubaki News: Scan And Plan
- Tsubaki News: More Innovation from Tsubaki!
- Tsubaki News: LAUNCH OF TSUBAKI OF CANADA'S SITE FOR KABELSCHLEPP
- Tsubaki News: Tsubaki KabelSchlepp’s New TKA Series Cable & Hose Carriers
- Tsubaki News: BLUE THUNDER IS COMING!
- Tsubaki News: Tsubaki Advantage Power Play Contest
- Tsubaki News: Now On Social Media
- Tsubaki News: Meet New President Kevin Powers
- Tsubaki News: Discover your Tsubaki Advantage
- Tsubaki News: Discover Your Advantage with Tsubaki's Engineered Chain
- Tsubaki News: Kabelschlepp Division
- Launch of Tsubaki’s First-Ever Virtual Plant Tour
- Tsubaki News – Tsubaki of Canada Limited achieves ISO 14001 accreditation
- Tsubaki News – Engineered Chain
- Introduction to Tsubaki Advantage
Cost Savings
- Cost Savings Highlight: Cam Clutch
- Cost Savings Highlight: Super Stainless Chain
- Cost Savings Highlight: Workhorse Elevator Chains
- Cost Savings Highlight: Bushings for Sprockets
- Cost Savings Highlight: Energy Series Sprockets
- Cost Savings Highlight: 4 Reasons to Use Tsubaki Advantage
- Cost Savings Highlight: Introducing STAGE-1
- Cost Savings Highlight: G8 Neptune & G8 Lambda
- Cost Savings Highlight: Chain Inspection
- Cost Savings Highlight: Stone Elevator Sprocket with Wear Indicator
- Cost Savings Highlight: Power-Lock
- Cost Savings Highlight: Cost Effective, Not Costly
- Cost Savings Highlight: Rotary Drum Furnace
- Cost Savings: Chain Failure
- Cost Savings: SJ3 Sealed Chain Design
- Cost Savings: Incline Chip Conveyor
- Cost Savings Highlight: Synthetic Gypsum Bucket Elevator
- Cost Savings Highlight: Edger Drive
- Cost Savings Highlight: Looper Exit
- Cost Savings: Debarker Drive
- Cost Savings: Edger Infeed Table
- Cost Savings: Smart Gates/ Spreader Chains
- Cost Savings: Chocolate Forming Line
- Cost Savings: Lumber Sorter
- Cost Savings: Sawmill Optimizer
- Cost Savings: Sorter Drive
- Cost Savings Highlight: Lumber Planer Mill
- Product Focus: Conduflex
- Inclined Chips Conveyors
- Gypsum Plant
- Surface Exploration Drill
- Cost Savings Highlight
Tech Talk
- Tech Time: Custom Sprocket Capabilities
- Tech Time: Super Stainless Sprockets
- Tech Time: Chains for Asphalt and Paving Industry
- Tech Time: Varitrak S/SX Series
- Tech Time: Extended Travel Support Systems
- Tech Time: Importance of Strain Relief
- Tech Time: Solutions to Harsh Environments
- Tech Time: G8 Heavy Duty Drive Chain
- Tech Time: Diasaw Website
- Tech Time: SMART TOOTH™ Sprockets
- Tech Time: Power-Lock Selection Guide
- Tech Time: Backstop Size Selection
- Tech Time: Not All Chains Are Created Equal Part 4 - Corrosion
- Tech Time: Not All Chains Are Created Equal Part 3 - Tensile & Fatigue Failure
- Tech Time: Tsubaki WORHORSE Elevator Chain
- Tech Time: Not All Chains Are Created Equal Part 2 - Mechanical Wear
- Tech Time: Not All Chains Are Created Equal
- Tech Time: Using old sprockets with new chain
- Tech Time: Matching and Tagging: High Accuracy, Narrow Tolerance
- Tech Time: To Idle or not to Idle, and where to put it
- Tech Time: Choosing the right chain for the job at hand
- Tech Time: Flame vs. Induction Hardening
- Tech Time: Choosing the Correct Attachment Chain For the Job At Hand
- Tech Time: Energy Series Chain
- Tech Time: Tsubaki Super Chain
- Tech Time: Sprocket Wear Indicators
- Tech Time: There’s an app for that.........
- Selecting the Proper Carrier Bend Radius & Mounting Height for Cables & Hose Carriers
- Stick Slip
- Pitch Line Clearance
- Strain Relief
- Double Pitch Roller Chain Sprockets