ARTE
BELEZA E BEM-ESTAR
ARTESANATO
CULTURA E HISTÓRIA
ENTRETENIMENTO
MEIO AMBIENTE
COMIDA E BEBIDAS
ENGENHARIA REVERSA
CIÊNCIAS
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TECNOLOGIA
TECNOLOGIA VESTÍVEL
The MacPherson Strut: The Damper Is the Upper Link
Independent front suspension usually needs two wishbones per wheel, a spring and a damper. Earle S. MacPherson, an engineer at General Motors and then Ford, combined the damper, the spring and the upper link into one telescopic strut running from the hub up to the body, with a single lower link at the bottom. His patent was filed in 1947 and granted in 1953.
It is cheap, light and compact, and it leaves room across the car for the engine — which is why most small front-wheel-drive cars use it.
This rung computes how the wheel's camber changes as the suspension moves, and builds a cardboard front-view model to measure it with a protractor.
Intermediário
About 3 hours
Instruções
1
1
Read MacPherson's patent
Read MacPherson's patent
US 2,624,592, 'Vehicle Wheel Suspension System', Earle S. MacPherson of Detroit, filed 21 March 1947 (Serial 736,262), granted 6 January 1953. The wheel's stub axle is connected *"to the body by a vertical telescopic strut"* and *"by a pair of horizontal swinging links"*; one link is *"formed as a turnbuckle"* for adjustment, and rubber bushes give *"a certain degree of universal joint action"*. The figures include a section of the strut's shock-absorber valving.
2
2
Camber change over the travel
Camber change over the travel
A carregar o notebook Jupyter…
3
3
Build a front-view model
Build a front-view model
On a sheet of plywood, mark the car's centre line and 'ground'. Use the notebook's dimensions at half scale. Pin a strip of balsa as the lower link at its inner pivot. Make the strut from two cardboard tubes, one sliding in the other, pinned at the top mount and at the link's outer end. Glue a cardboard 'wheel' rigidly to the lower tube.
Move the link end up and down in 20 mm steps and measure the wheel's lean with the protractor. Compare with the notebook. Then move the inner pivot up by 20 mm and repeat: the camber curve changes — this is how suspension designers tune it.
Materiais para este passo:
Placa de contraplacado1 folha
Placa de madeira de balsa1 folha
Tubo de cartão2 peças
Parafusos de máquina4 peçasFerramentas necessárias:
Transferidor
Régua
Berbequim sem fios
Jogo de brocas4
4
History and context
History and context
**US 2,624,592, 'Vehicle Wheel Suspension System', Earle S. MacPherson; filed 21 March 1947, granted 6 January 1953.** The design first went into production on Ford of Britain cars in the early 1950s and became the most common front suspension on small cars.
**Honest limits.** The camber change and roll behaviour are harder to tune than with two wishbones; the strut's sliding seal carries side loads and wears; and the tall strut sets the height of the bonnet line.
Materiais
4- 1 folhaReferência
- 1 folhaReferência
- 2 peçasReferência
- 4 peçasReferência
Ferramentas necessárias
4- Referência
- Referência
- 1 vendor sell this, none ship to you yetReferência
- Referência
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