Linkages
Definition
Linkage
A mechanical system of connected parts that changes the direction or size of a force.
Linkages are essential components in mechanical systems, used to:
- Change the direction of movement
- Alter the magnitude of a force
- Control the motion of system parts
Types of Linkages
- Parallel Linkages
- Reverse Linkages
- Bell Crank Linkages
Parallel Linkages
Definition
Parallel Linkage
A mechanism where a central point is constrained to move in a nearly straight line by the arrangement of linked bars.
- Maintains Orientation: Keeps the connected parts parallel throughout the motion.
- Even Force Distribution: Distributes force evenly across the linkage.
Example
- Suspension Systems: Used in vehicles to keep wheels aligned with the road.
- Drawing Boards: Ensures the drawing surface remains level.
Reverse Linkages
Definition
Reverse Linkage
A linkage that reverses the direction of a force or motion.
- Direction Change: Converts input motion into the opposite output motion.
- Simple Design: Often consists of a single pivot point.
Example
- Windshield Wipers: Converts rotational motion into back-and-forth movement.
- Pumps: Changes linear motion into rotational motion.
Bell Crank Linkages
Definition
Bell Crank Linkage
A linkage that converts vertical motion into horizontal motion, or the other way around.
- Angle Conversion: Alters force direction, usually at a right angle.
- Force Amplification: Can increase or decrease force magnitude.
Example
- Bicycle Brakes: Transmits force from the brake lever to the brake pads.
- Steering Systems: Changes the direction of steering input.
How Linkages Work
- Input Motion: A force or movement is applied to one part of the linkage.
- Transformation: The linkage alters the direction, magnitude, or path of the motion.
- Output Motion: The transformed motion is transmitted to another part of the system.
