穴と長円の穴を用いた位置決めによる組立ばらつきの解析

抄録

This paper discusses assembly variation by positioning using a hole, a slot, and two bosses. Two parts positioned using a hole and slot are moved relative to each other during assembly because of the clearance between a boss and hole, or a boss and slot. The relative motion of two parts using this positioning is apt to be considered to be wobbling. However, in many cases, equal boss-hole and boss-slot clearances are toleranced. Therefore, this motion is more complex than simple wobbling. We considered the motion area by positioning using a hole, a slot, and two bosses. The distance from the primary boss to secondary boss is L. The boss-hole and boss-slot clearances are 2δ, and the motion area of an arbitrary point (X, Y ) is as follows: x = 2 δ {Y/L(sin θ +1)+cos θ } (tan θ = Y/L), y = 2 δ (X ≦L), y = 2 δ (2X/L-1) (X ＞L). We present a tolerance analysis application using the above.