What the heck is a Bellcrank?

[samo_ott]

on a 1961 40hp. And how does it affect shifting? thx.

 

[Scaaty]

Re: What the heck is a Bellcrank?

Fancy name for a gear..
...and if broke teeth, mis aligned, stripped shaft setscrew, etc, it won't, to answer the second question

 

[Chinewalker]

Re: What the heck is a Bellcrank?

It's not a gear...

Depends on where you're looking. If you're up above, it could refer to the arm that runs between the shift handle and the armature plate with the pivot in the middle - has detents on the bottom end for the shift handle and a spring at the top end to put tension on it.

Could also refer to the part in the gearcase itself that transfers the movement from the shift rod to the shift dog.

- Scott

 

[Scaaty]

Re: What the heck is a Bellcrank?

OK ..gear/lever? Heck, could be lot of things..we need a little more specific on the question here..(never a big love affair with the engineers I had to work with..)

 

[F_R]

Re: What the heck is a Bellcrank?

Think of an old bell in the bellfry at school, church or wherever. It tilted back and forth to ring it. Attached to the bell, was a lever with a rope hanging down that you pulled to ring the bell. The lever was a -- bellcrank! It converted up and down motion of the rope to rotary motion of the bell. OK, so you gotta be 70 years old to know about bells, and the word is pretty much obsolete.

One bellcrank in an outboard motor is the lever on the inside end of the gearshifter shaft that converts rotary motion of the shaft to up and down motion of the shift rod. Is that the one you are thinking of?

 

[BoatBuoy]

Re: What the heck is a Bellcrank?

Another example is the connecting rod and crank. It converts lateral motion to rotary motion. With respect to your question, it's probably referencing the shift lever which converts rotary motion to push/pull the shift rod.

 

[Scaaty]

Re: What the heck is a Bellcrank?

Actually a bellcrank would be something similar to 1/4 of a full gear, but we are getting tecnical here, and what the heck...(its raining...I'm bored)

 

[jtexas]

Re: What the heck is a Bellcrank?

rotary motion, push-pull motion....bellcrank my @**! no, on section thought, don't..................................

 

[HighTrim]

Re: What the heck is a Bellcrank?

I assume he`s changing the impeller and needs to find the `bellcrank` to disengage the shift rod to drop the lower unit. It kinda looks like 2 pieces of metal about 4 inches long and an inch wide squeezed together around a pin that secures the shift rod connector and that pivots like a teeter totter or see saw, depending on ur age, im too young for the bell analogy, lol

 

[samo_ott]

Re: What the heck is a Bellcrank?

ok, ok... I got it... it's the doo-hickey that connects the shift lever to the shifter rod it sounds like... thx

 

[Silvertip]

Re: What the heck is a Bellcrank?

Nope -- 1/4 (or any fraction) of a gear is a "sector gear". Shown below are a couple of bellcranks. On these examples, the pivot is in the center. Pushing or pulling on one of the arms, causes the other arm to move in a different direction. Length of the arms determines distance of travel. Bellcranks can increase motion, decrease motion, or have equal motion.

 

[jddenham]

Re: What the heck is a Bellcrank?

He with the most posts, wins . . . .

 

[Scaaty]

Re: What the heck is a Bellcrank?

Crank it up!( And re-reading this, I was somehow confused with the ball gears at the tiller, which is a problem of a neighbor's of mine on my mind)
Gear teeth can be had at the end of any lever too, and it would be called a bell crank. Think those old OMC out drives (wait..might be sector gears!)...(I'm heading for Google/Wiki on this..still raining, still bored, still getting old and more stupid)
"
A bell crank is a type of crank that changes motion around a 90 degree angle. The name comes from its first use, changing the vertical pull on a rope to a horizontal pull on the striker of a bell, used for calling servants in upper class British households.
The bell crank consists of an "L" shaped crank pivoted where the two arms of the L meet. Moving rods (or ropes) are attached to the ends of the L arms. When one is pulled, the L rotates around the pivot point, pulling on the other arm.
Changing the length of the arms changes the mechanical advantage of the system. Many applications do not change the direction of motion, but instead to amplify a force "in line", which a bell crank 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 non-linear the motion becomes (the more the motion ratio changes).

 

[samo_ott]

Re: What the heck is a Bellcrank?

Scatty wins! Thanks all...

 

[jddenham]

Re: What the heck is a Bellcrank?

Quand j'?tais enfant, je n'?tais pas grand . . . je pr?sentais ma belle cranque ? tous les passants . . . .