Break Solution for Chain and Sprocket Mechanism
Break Solution for Chain and Sprocket Mechanism
(OP)
Hi,
I'm trying to come up with a low-tech and simple breaking solutions for a chain and sprocket mechanism.
The mechanism itself is very simple, it suppose to pivot an arm to different positions (bi-directional) and is comprised off a driven and driving sprockets connected with a chain and a tensioner and I'm trying to come up with an idea for stopping the driven sprocket from transferring forces from the arm back to the driving sprocket while the system is static (and not to maintain the arms position so it doesn't have to be too precise).
Thanks.
I'm trying to come up with a low-tech and simple breaking solutions for a chain and sprocket mechanism.
The mechanism itself is very simple, it suppose to pivot an arm to different positions (bi-directional) and is comprised off a driven and driving sprockets connected with a chain and a tensioner and I'm trying to come up with an idea for stopping the driven sprocket from transferring forces from the arm back to the driving sprocket while the system is static (and not to maintain the arms position so it doesn't have to be too precise).
Thanks.





RE: Break Solution for Chain and Sprocket Mechanism
Possible ideas are adaptations of bicycle brake mechanisms (rim clamp, hub brake, or disk brake).
Simple wrap-around friction brake systems or mechanical ratchet & pawl systems.
Or industrial power transmission brakes & clutches like these
http://www.warnerelectric.com/products
TygerDawg
Blue Technik LLC
Virtuoso Robotics Engineering
www.bluetechnik.com
RE: Break Solution for Chain and Sprocket Mechanism
Do you mean braking?
--
JHG
RE: Break Solution for Chain and Sprocket Mechanism
Some ancient disk brake systems had parking brakes that jacked the service brake pads against the rotor with a mechanism built into the service piston, but they fell out of favor because of complexity and corrosion.
You could use something as simple as a C-clamp squeezing the driven sprocket, with the clamp frame attached to something stationary.
... all depending on the load, not specified.
Mike Halloran
Pembroke Pines, FL, USA
RE: Break Solution for Chain and Sprocket Mechanism
I assume the drive chain wraps around the driven sprocket by 180-190̊, leaving some clear/open sprocket circumference and teeth btwn. the two parts of drive chain. Make a shear key/bar/plate with the cut out shape btwn. two or three sprocket teeth on one edge. This is spring loaded, and pulled back to clear the sprocket when the sprocket is operating, and released to engage the teeth when you want the sprocket holding action. This shear key is supported by two vertical plates on either side of the sprocket, assuming the sprocket is vert. and parallel in its plane to the two reaction plates. What you attach the two reaction plates to depends on your machine structure and torque req’d. How you actuate the shear key and lock it down depends on your imagination.
RE: Break Solution for Chain and Sprocket Mechanism
One could adapt to apply brake pressure when the drive is powered down - looks cool, too.
From the industrial sector - http://ipaper.ipapercms.dk/SvendborgBrakes/product...
spring applied hydraulic release
RE: Break Solution for Chain and Sprocket Mechanism
I did all the calculation to ensure the structural integrity of the drive mechanism and i thought about designing a simple brake for the driven sprocket.
I like your idea , i think i'll use it with a solenoid to disengage, and a spring to engage the brake.
And yeah, sorry for the spelling, not my native language