202
𝑎 =
𝑑
1
+ 𝑑
2
2
=
𝑚(𝑧
1
+ 𝑧
2
)
2
Reykali uzatmalar shesternyaning aylanma
harakatini reykaning
ilgarilanma harakatiga va aksincha - reykaning
ilgarilanma harakatini
shesternyaning aylanma harakatiga aylantirish uchun kerak.
Uzatmaning asosiy
elementlari tishli reyka va shesternyadir (3.4.5-rasm).