submit to reddit


Please Let Me Know How Much You Like This (1 is very Bad - 10 is Excellent)




Four bar linkage 8a




A special case of the 4-bar linkage.

Input: pink crank

Output: green crank.

The unusualness: a working cycle of the mechanism corresponds 2 revolutions of the input. Output oscillating angle is larger than 180 deg., a thing that is hard to get by using an ordinary 4-bar linkage. It happens because:

1. The sum of the lengths of the two adjacent links is equal to the sum of the lengths of the other two links.

A + B = C + D

A: length of pink crank (=10)

B: length of yellow conrod (=40)

C: length of green crank (=20)

D: distance between fixed axes of pink and green cranks (=30)

2. There are measures to overcome dead position (when green crank and yellow conrod are in line). For example, inertia of the green crank must be big enough.




(c) www.mechanisims.co All rights reserved.