| 摘要 |
An intake manifold (100) having variable diameters is provided. The intake manifold (100) includes a tube body (110) and a valve (120) . The valve is rotatably disposed in the tube body (110), wherein the valve (120) is a hollow-ring and comprises an outer circumference (122) and an inner circumference (121), and a gradient curve surface (123) is formed from the outer circumference (122) to the inner circumference (121). The inner circumference (121) defines a inlet face (A2), and a gradually varied angle is formed between a normal vector (T2) of the inlet face (A2) and a cross section (A1) at an end of the tube body (110) while the valve (120) rotates.It is also provided an intake manifold (200) having variable diameters. The intake manifold (200) includes a tube body (210) and a valve (220). The valve is composed of two hollow rings (221, 222), wherein the two hollow rings (221, 222) overlap along a central axis (X) of the tube body (210) and relatively rotate to each other around the central axis (X). Each of the two hollow rings (221, 222) comprise an inner circumference (221a) and an outer circumference (221b), a plurality of air holes (223, 224) having corresponded positions are formed between each of the inner circumference (221a) and each of the outer circumference (221b), and each of the inner circumference (221a) defines a inlet face (B1, B2). When the two hollow rings (221, 222) relatively rotate to a first position, the air holes (223, 224) of the two hollow rings (221, 222) are overlapped and through with each other; when the two hollow rings (221, 222) relatively rotate to a second position, the air holes (223, 224) of the two hollow rings (221, 222) are partially blocked with each other; and when the two hollow rings (221, 222) relatively rotate to a third position, the air holes (223, 224) of the two rings (221, 222) are completely blocked with each other. |
