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Youblob (generated from this blueprint's notebook) · CC0
Ackermann Steering: The Inner Wheel Turns Further
A cart turns by swivelling its whole front axle on a pin — simple, but the axle sweeps under the body and the cart grows unstable. In 1816 the Munich carriage-builder Georg Lankensperger pivoted each front wheel on its own stub instead, joined them with a tie rod, and angled the steering arms so the inner wheel turns further than the outer. Rudolph Ackermann patented it in England on his behalf in 1818, and the geometry has carried Ackermann's name ever since.
Every wheel should roll round one common centre on a turn; this linkage gets very close to that without any clever mechanism at all.
This rung works out the wheel angles and checks a trapezoid linkage numerically, then builds one and measures it with a protractor.
初心者
About 3 hours
手順
1
1
The angles, and the linkage that makes them
The angles, and the linkage that makes them
Jupyter ノートブックを読み込み中…
2
2
Build a steering model
Build a steering model
Cut a plywood 'axle beam' 300 mm long. Near each end, pivot a small plywood wheel carrier on a screw (the kingpin). Glue a steering arm to each carrier pointing backward and inward, so that the two arms, extended, meet at a point on the centre line one 'wheelbase' behind — use 520 mm for a 300 mm track, the same ratio as the notebook's car.
Join the arm ends with a tie rod of balsa strip, pinned at each end. Glue a protractor under each carrier.
Steer one wheel to 10°, 20° and 30° and read the other. Compare with the notebook's linkage column. Then make the arms parallel and repeat: both wheels now turn the same angle — the scrubbing layout.
このステップの材料:
合板1 枚
バルサ材の板1 枚
小ねじ6 個必要な工具:
コードレスドリル
ドリルビットセット
分度器
定規3
3
History and context
History and context
**Georg Lankensperger, Munich, 1816**; patented in England in 1818 by **Rudolph Ackermann**, his agent, as a steering for carriages. No patent number is asserted here. Charles Jeantaud refined the geometry in France later in the century, and the arrangement passed to the motor car.
**Honest limits.** The linkage is exact at only a few angles. At speed, tyres run at slip angles and a car may want less than full Ackermann; racing cars often use less or even reverse it. And the geometry assumes rigid wheels rolling without slip — a fair assumption only for slow, tight turns.
関連ブループリント
これらのブループリントは知識を共有しています — 技術、材料、原理
CC0 パブリックドメイン
このブループリントはCC0で公開されています。許可を求めずに、自由にコピー、修正、配布、あらゆる目的で使用できます。
メイカーを応援するには、ブループリント経由で製品を購入してください。メイカーには メイカーコミッション がベンダーにより設定されています。または、このブループリントの新しいイテレーションを作成し、自分のブループリントにコネクションとして含めて収益を共有できます。