To assist customers inspect and assess the condition of Industrial Clutch “LK” clutches, Torque Inc has developed the “LK-Inspection-Checklist“. Click on the link to access this helpful aid to ensure all critical parts are inspected during clutch maintenance or repair.
If you have additional questions, contact your local Sales Engineer of our Parts Hot line 800-771-5921. WE are happy to be of service.
There are many methods to mount a Clutch/Brake hub to the shaft of a Stamping Press or other heavy machinery. Torque Inc will help you pick the best type of connection for your application. The following is a summary of the benefits and limitations of the various methods:
Key with clearance
Using a clearance fit between the hub and the shaft while and hand fitting the key (or two keys) is the most common method. Clearance of a couple of thousandths of an inch with line/line for the keyway is typical. This connection will likely gradually get loose at some point in time, is likely the most common type used on a press.
Key with interference
Adding a slight interference with a hand fit key is a more permanent solution, albeit requiring a modest heating of the hub (to about 250- 300 degrees F through via oil bath, oven or induction heater). Typical fit of line/line to .001”/.002” for shaft size of 6”.
Key with heavier interference
Increasing shrink to .0005” per inch of diameter (ie. .003” interference for 6” bore ) is achievable with a 300-400 degree heat and dry ice of the shaft. This fit is recommended for high shock load/high reversing loads like shears and high stripping force dies, cold forging etc. Care must be taken not to end up with too tight a fit over a key, in that this can cause the hub to split through the keyway. Heavy interference fits are difficult to remove without damaging the shaft/bore interface.
Heavy Interference without key
Using a .001” per inch of shaft diameter interference (ie. .006”-.009” shrink for a 6” shaft) , or more, can often times gain enough torque to drive without a key or supplemental locking device. However, we do not recommend retrofitting using this method due to the following problems, indluding but not limited to:
1. Precise material specifications are required,
2. Precise machining is required,
3. Installation is tricky
4. Removal does damage to the shaft and hub bore.
The best system is a Engineered Locking Element without a key
Using an engineered locking device such as a Ringfeder, Climax or Bloc creates the advantages of heavy inference shrink fit connection (ie. No backlash ever, removability, ease of assembly and strongest possible shaft and hub design due to no stress risers from keys) without the disadvantages. Some applications are hard to retrofit due to space and material issues. These devices require proper dimensions and installation procedures and torque instruction be followed in order to function properly. However the devices have a 100% success rate when properly engineered and installed (in fact they frequently can carry more torque than the shaft itself can!) .
There are two primary types of keyless locking devices.
Wichita Clutch CCB with Shrink Disc mounted hub
The “shrink disc” goes outside of a hub extension and squeezes the hub to the shaft. Advantages are a infinite choice of shaft sizes (ie. Can match any existing shaft assuming it is round and finished properly) and has a relatively high torque rating. Material can be cast iron or steel
Industrial Clutch Hub mounted to shaft with internal locking element.
The internal “locking assembly “ is sometimes easier to fit in (goes inside existing hub) but can only fit a finite number of standard shaft sizes and requires an adequate OD to provide enough strength the keep hub from cracking. Material required to be steel or steel sleeved cast iron.
Proper selection of either version of an engineered locking element requires the qualified engineering assistance that Torque Inc. can provide to insure a successful installation.
Often the cost of the device is offset by the reduction in labor/machining cost associated with putting a connection together!
Wichita Clutch supplies standard Kopper Kool Brake (KKB) renewal kits in two configurations to make repairing and rebuilding your brakes easier and more cost effective. KKB Renewal kits include the following items:
Copper Wear Plates
ID/OD O-rings
Nut’s and Bolts
Springs if used in current rev. of Parts List.
Friction Material, Rivets and Washers (partial)- or – Complete Drive Plate assemblies (complete)
KKB Renwal Kit Parts Breakdown
Contact your local Torque Inc., Application Engineer if you have any questions. They are happy to be of assistance.
Testing of rebuilt pendulum shear gear box by Horsburgh & Scott Rebuild Center. Video shows Wichita Clutch ATD 236 LIC mounted to Flywheel on intermediate gear Quill Shaft. Wichita ATD 260 LIB mounted on output shaft on back of gear box.
Torque Inc., is available to assist you with by either:
* Complete rebuild @ Torque Inc., with 1 year warranty on workmanship.
* Parts and Technical support for you to rebuild in house.
Torque Inc can quickly assist you to determine if your Wichita/Industrial unit needs a rebuild or replacement based on cost, availability and your specific requirements. Proper rebuild of a Wichita/Industrial clutch or brake is a multi-step process that typically returns the unit to serviceable condition for less than a new replacement unit.
For more information about rebuilding your Wichita/Industrial unit, click on links below:
With your clutch or brake Serial Number, Torque Incs’ expert customer service representatives have the tools to quickly and accurately identify the exact parts and technical support you require. Torque Inc., can quickly email you detailed drawings, parts lists and quotes in .pdf format. Use the links on this page or call the PARTS HOTLINE 800-771-5921, to get started.
Need on site support? Torque Inc. application engineers are available at your plant for assistance. Invite your local Torque Inc. application engineer to help identify your exact units, troubleshoot your clutches and brakes or provide technical assistance. Torque Inc. application engineers are highly trained and experienced in solving your problems.
ABOUT TORQUE INC:
Torque Inc. has represented Wichita Clutch for 60 years and continues to provide Heavy Duty Clutches/Brakes to the Metal Forming, Coil Processing, Converting, Printing, Marine, Mining and other heavy industries. Our staff of expert application engineers and professional customer service representatives is available to support you with:
