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#1
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odd trike steering - have you seen this before?
I am pondering building a tilting trike for some amusement. The idea I
came up with is shown he http://www.norcom2000.com/users/dcim...ff/common.html (alternate) http://tinyurl.com/2nkdlr In this diagram, the blue cross-bars are set on longitudinal pivots (red dotted lines) so that the blue crossbars can tilt left and right, but not turn left and right. The kingpins are set on ball joints so that they will bend up and down on the crossbar ends, as well as turn left and right. The kingpins are set with typical-upright bicycle-style rake and trail (indicated by the orange and grey dotted lines) and other than the two pivot points of the two blue cross-bars, there is no mechanical connection to the kingpins at all. The control levers (purple) are connected only to one of the cross-bars, allowing the rider to control the tilt left-and-right. Because of their rake & trail, the front wheels will roll where they are tilted--just like the front wheel of an upright bike does when you ride no handed. This type of tadpole-trike steering system presents a number of advantages. ------- Given the length of time that bicycles have been around, it's a fair assumption that anything that will work has already been tried a half-dozen times already--it's just a matter of if anyone else was watching at the time or not. So I was not real surprised when I found one other vehicle that seems to use the same type of "free kingpin" steering setup: http://www.tiltingvehicle.net/technical.html I don't understand everything this fellow says about his setup (particularly this "low-speed steering cable" thing he goes on about) but it looks to be the same basic concept. His steering is hydraulically-operated, I assume to prevent suspension movement from transmitting backwards into the steering controls. An unsuspended HPV would have no need for external power to drive the tilting mechanism. ....This guy also makes the notable point that this type of steering will not oversteer. If either end loses traction around a turn, the steering will automatically drift into understeer. ------- I have looked around for any HPV's with steering done this way (that is, with un-steered kingpins) and have not found any. Has anyone seen any? ~ |
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#2
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odd trike steering - have you seen this before?
DougC schrieb:
I am pondering building a tilting trike for some amusement. The idea I came up with is shown he http://www.norcom2000.com/users/dcim...ff/common.html (alternate) http://tinyurl.com/2nkdlr In this diagram, the blue cross-bars are set on longitudinal pivots (red dotted lines) so that the blue crossbars can tilt left and right, but not turn left and right. The kingpins are set on ball joints so that they will bend up and down on the crossbar ends, as well as turn left and right. The kingpins are set with typical-upright bicycle-style rake and trail (indicated by the orange and grey dotted lines) and other than the two pivot points of the two blue cross-bars, there is no mechanical connection to the kingpins at all. The control levers (purple) are connected only to one of the cross-bars, allowing the rider to control the tilt left-and-right. Because of their rake & trail, the front wheels will roll where they are tilted--just like the front wheel of an upright bike does when you ride no handed. This type of tadpole-trike steering system presents a number of advantages. ------- Given the length of time that bicycles have been around, it's a fair assumption that anything that will work has already been tried a half-dozen times already--it's just a matter of if anyone else was watching at the time or not. So I was not real surprised when I found one other vehicle that seems to use the same type of "free kingpin" steering setup: http://www.tiltingvehicle.net/technical.html I don't understand everything this fellow says about his setup (particularly this "low-speed steering cable" thing he goes on about) but it looks to be the same basic concept. His steering is hydraulically-operated, I assume to prevent suspension movement from transmitting backwards into the steering controls. An unsuspended HPV would have no need for external power to drive the tilting mechanism. ...This guy also makes the notable point that this type of steering will not oversteer. If either end loses traction around a turn, the steering will automatically drift into understeer. ------- I have looked around for any HPV's with steering done this way (that is, with un-steered kingpins) and have not found any. Has anyone seen any? ~ My steering is also not satisfying but we work on that... http://www.youtube.com/watch?v=9pFXZyp0EyU |
#3
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odd trike steering - have you seen this before?
On Apr 29, 1:56*pm, DougC wrote:
Given the length of time that bicycles have been around, it's a fair assumption that anything that will work has already been tried a half-dozen times already--it's just a matter of if anyone else was watching at the time or not. So I was not real surprised when I found one other vehicle that seems to use the same type of "free kingpin" steering setup:http://www.tiltingvehicle.net/technical.html I don't understand everything this fellow says about his setup (particularly this "low-speed steering cable" thing he goes on about) but it looks to be the same basic concept. His steering is hydraulically-operated, I assume to prevent suspension movement from transmitting backwards into the steering controls. An unsuspended HPV would have no need for external power to drive the tilting mechanism. An interesting concept. A quick experiment shows that at a brisk walk I can steer my bike quite easily with just a hand on the saddle, but at slower speeds the wheel only responds to excessive leans. ...This guy also makes the notable point that this type of steering will not oversteer. If either end loses traction around a turn, the steering will automatically drift into understeer. * ------- I have looked around for any HPV's with steering done this way (that is, with un-steered kingpins) and have not found any. Has anyone seen any? ~ |
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