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of the system. Many applications do not change the direction of motion but instead amplify a force "in line", which a bellcrank can do in a limited space. There is a tradeoff between range of motion, linearity of motion, and size. The greater the angle traversed by the crank, the more the motion
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may not be feasible in some vehicle designs due to space, aerodynamic, or other design constraints; bellcranks translate the vertical motion of the wheel into horizontal motion, allowing the suspension to be mounted transversely or longitudinally within the vehicle.
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A typical 90-degree bellcrank consists of an L-shaped crank pivoted where the two arms of the L meet. Moving rods or cables are attached to the outer ends of the L. When one is pulled, the L rotates around the pivot point, pulling on the other rod.
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A typical 180-degree bellcrank consists of a straight bar that pivots at or near its center. When one rod is pulled or pushed, the bar rotates around the pivot point, pulling or pushing on the other rod.
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that changes motion through an angle. The angle can range from 0 to 360 degrees, but 90-degree and 180-degree bellcranks are most common.
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Bellcranks are also seen in automotive applications, such as in the linkage connecting the throttle pedal to the
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The name comes from its first use, changing the vertical pull on a rope to a horizontal pull on the striker of a
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Illustration of a bellcrank from the 1908 Chambers's
Twentieth Century Dictionary
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Bellcrank mechanisms were installed at the top of entryway stairs in multi-unit
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is translated by a bellcrank to a push rod, which selects which portion of the
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318:"The story behind that weird lever at the top of the stairs in old SF homes"
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ratio changes, and the more non-linear the motion becomes.
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Changing the length of the bellcrank's arms changes the
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27:Type of crank that changes motion through an angle
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374:Sheldon Brown's Bicycle Technical Info
348:Sheldon Brown's Bicycle Technical Info
255:or connecting the brake pedal to the
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52:Please help
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69:"Bellcrank"
408:Categories
327:9 November
303:References
253:carburetor
247:Automotive
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18:Bell crank
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