Couplings, Clutches and Breaks Flashcards
What are three (3) types of positive contact clutches?
- Square Jaw
- Spiral Jaw
- Multiple tooth design
Which chain coupling allows for the most end float?
Single strand roller chain
What are single universal joints limited to?
- Low forces
- Low Operating Speeds
- Small angles
Describe square jaw clutches?
They can be engage at very low speeds at any direction (10 rpm max)
Where are double universal joints used?
Where there is deliberate angular, or parallel offset
Describe spiral jaw clutches
They can be engaged at higher speeds and can drive in one direction only (max 150 RPM)
Describe a multiple tooth clutch
They use a large number of small teeth for engagement. They can engage at 300 rpm max
What is a friction clutch?
They provide a smooth transfer of power during engagement. They can be engaged at any speed
What is the advantage of a chain coupling?
It is very easy to disconnect. It can be replaced without moving either the drive or driven shaft
What are the two (2) classes of friction clutches?
- Radial
* Axial
What are the two (2) types of radial friction clutches?
*Expanding Shoe
and
*Contracting Shoe
What are the three (3) types of axial friction clutches?
- Single disc
- Multi disc
- Cone
What does a machine lever, over center mean?
it allow the clutch to be locked or unlocked without continuous mechanical pressure
How must double universal joints be installed?
They must be assembled in phase
Where are CV joints used?
They are used where the joints angles are unequal or changing
Describe a ribbed coupling and its used?
They are clamped to keep all the parts in place, but the power is transmitted through the keys. they are used in heavy loads and torque machines
What is a cone clutch?
Is a cross between a radial and axial clutch on which provides a mechanical advantage due to the wedge in the drum. They have the tendency to grab
How is an expanding shoe clutch activated?
Hydraulically or Hydraulics
One disadvantage of a centrifugal coupling is?
It’s never fully engaged.
In order for a universal joint coupling to accommodate angular and offset it must be a?
Double Universal Joint
A splined connection is a universal joint coupling is used to?
Allow for axial movement
How can we be assured of proper clamping force in ribbed coupling?
Make sure that there is a gap between the halves after properly torquing the fasteners
What coupling must be removed in order to do an alignment?
Multi-bore
Which chain coupling can transmit the most amount of power?
Silent Chain
Which class of couplings is most likely to require lubrication?
Mechanical flexible
Which coupling that’s rigid is suitable for low speeds and torque applications?
Sleeve
How is a contacting shoe clutch activated?
Pneumatically
What type of clutch uses a pressure plate?
Axial friction
Which coupling has a poor torsional flexibility?
Gear coupling
Another name for the turbine in a fluid coupling is?
Runner
What is the reason for curved teeth in a gear coupling?
Increased the amount of misalignment that the coupling can tolerate compare to the one with straight teeth
Which mechanical flexible coupling does not required lubrication?
Synthetic Chain
