INTERNALLY-TOOTHED MEMBER, METHOD OF MOLDING INTERNALLY-TOOTHED MENBER, AND MOLDING EQUIPMENT FOR INTERNALLY-TOOTHED MEMBER

摘要

(Problem) with internal teeth also reduce the size of the member to improve the quality, durability and productivity of the inner tooth member. ; (Solving means) has a first cylindrical portion, and the first cylinder is greater than the second diameter of the cylindrical portion. Projecting the inner peripheral surface of the first and second cylindrical portion to the inside in the radial direction are respectively formed by the first and second internal teeth. Can be formed values ​​(齒) engaging portion formed by extruding a second internal teeth on an inner peripheral surface and the second cylindrical portion, it does not increase the diameter of the inner tooth member. Since this from happening, the thickness between the second internal teeth and the recesses (72) formed as thin as the second internal teeth, possible to prevent the crack generation, so it is possible to improve the durability of the inner tooth member. Since there is no engagement what the slope generated in the inner peripheral surface portion it is possible to improve the quality of the inner tooth member. ; Nechi member, an automatic transmission, the sun gear, a pinion, a ring gear, a carrier.