SANAT
GÜZELLİK & SAĞLIK
ZANAAT
KÜLTÜR & TARİH
EĞLENCE
ÇEVRE
YİYECEK & İÇECEK
TERS MÜHENDİSLİK
BİLİMLER
SPOR
TEKNOLOJİ
GİYİLEBİLİR ÜRÜNLER
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.
Orta
About 3 hours
Talimatlar
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
Jupyter defteri yükleniyor…
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.
Bu adım için malzemeler:
Kontrplak levha1 yaprak
Balsa Ağacı Levha1 yaprak
Karton boru2 adet
Makine vidaları4 adetGerekli aletler:
İletki
Cetvel
Kablosuz Matkap
Matkap Ucu Takımı4
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.
Malzemeler
4- 1 yaprakYer Tutucu
- 1 yaprakYer Tutucu
- 2 adetYer Tutucu
- 4 adetYer Tutucu
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