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Guest
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 Posted: Fri Aug 31, 2007 12:48 am Post subject: crankpin can send transverse forces to the connecting rod? |
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they say that the crosshead type of engine was invented to overcome
the problem of, crankpin originating transverse forces up the
connecting rod to the piston, causing ovalization of the bore.
I can't visualize how a properly toleranced & fitted crankshaft/
crankpin is originating sideways movement.
what am I missing? |
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Jim Wilkins
Guest
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| Posted: Fri Aug 31, 2007 12:48 am Post subject: Re: crankpin can send transverse forces to the connecting ro |
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On Aug 30, 5:27 pm, dances_with_barka...@yahoo.com wrote:
| Quote: | they say that the crosshead type of engine was invented to overcome
the problem of, crankpin originating transverse forces up the
connecting rod to the piston, causing ovalization of the bore.
I can't visualize how a properly toleranced & fitted crankshaft/
crankpin is originating sideways movement.
what am I missing?
|
Which sideways direction isn't obvious? Without a crosshead, when the
crank throw of a horizontal engine is straight up, the angled
connecting rod forces the piston hard against the lower cylinder wall.
The crosshead also facilitates double-acting engines.
jw |
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Guest
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| Posted: Fri Aug 31, 2007 12:48 am Post subject: Re: crankpin can send transverse forces to the connecting ro |
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On Aug 30, 5:27 pm, dances_with_barka...@yahoo.com wrote:
| Quote: | they say that the crosshead type of engine was invented to overcome
the problem of, crankpin originating transverse forces up the
connecting rod to the piston, causing ovalization of the bore.
I can't visualize how a properly toleranced & fitted crankshaft/
crankpin is originating sideways movement.
what am I missing?
|
Anytime the crank rod does not line up with the bore (rod big end,
piston pin in a line) and the piston is pushing on the crank, or the
crank is pushing on the piston, there is a side-force.
Dave |
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Jim Stewart
Guest
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| Posted: Fri Aug 31, 2007 12:48 am Post subject: Re: crankpin can send transverse forces to the connecting ro |
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dances_with_barkadas@yahoo.com wrote:
| Quote: | they say that the crosshead type of engine was invented to overcome
the problem of, crankpin originating transverse forces up the
connecting rod to the piston, causing ovalization of the bore.
I can't visualize how a properly toleranced & fitted crankshaft/
crankpin is originating sideways movement.
what am I missing?
|
The con rod bushing on a steam engine? |
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Joe Pfeiffer
Guest
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| Posted: Fri Aug 31, 2007 12:48 am Post subject: Re: crankpin can send transverse forces to the connecting ro |
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dances_with_barkadas@yahoo.com writes:
| Quote: | they say that the crosshead type of engine was invented to overcome
the problem of, crankpin originating transverse forces up the
connecting rod to the piston, causing ovalization of the bore.
I can't visualize how a properly toleranced & fitted crankshaft/
crankpin is originating sideways movement.
what am I missing?
|
The piston is pushing down on the connecting rod, which is at an
angle. The force on the con rod has to be along the axis of the rod;
the other component of the force vector has to be supplied by the
cylinder wall. |
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