Cho bộ truyền xích có D1= 20 mm, D2= 40 mm, khoảng cách trục A =100mm. Xác định chiều dài L xích?
Trả lời:
Đáp án đúng: B
The length of the chain (L) for a chain drive can be approximated using the following formula:
L = 2A + (D1 + D2)/2 + (D2 - D1)^2 / (4A)
Where:
- L is the chain length.
- A is the center distance (A = 100 mm).
- D1 is the diameter of the driving sprocket (D1 = 20 mm).
- D2 is the diameter of the driven sprocket (D2 = 40 mm).
Plugging in the values:
L = 2 * 100 + (20 + 40)/2 + (40 - 20)^2 / (4 * 100)
L = 200 + 30 + (20)^2 / 400
L = 230 + 400 / 400
L = 230 + 1
L = 231
However, the options are significantly larger than 231. This suggests a different unit or coefficient might be involved (e.g., number of chain links instead of mm). The problem or provided options might be flawed due to missing crucial information like the chain pitch. Thus, it is impossible to determine the correct answer based on the given information.
Without further information, it's impossible to select a correct answer.
