| 摘要 |
An impact device includes a transmission shaft, an impact cylinder, two first impact pins and a first ring. The transmission shaft has an impacted section disposed in the impact cylinder, an extending section extending along an axis, a first protrusion extending toward a first radial direction, and two first concave surfaces located at the first protrusion. The impact cylinder has two elongated protrusions and two first radial holes separated by the elongated protrusions. The first impact pins are received in the first radial holes in parallel to the axis and abuttable against the first concave surfaces. The first ring is sleeved onto the impact cylinder and the first impact pins and has a first narrow groove in which one elongated protrusion is located, and a first wide groove in which the other elongated protrusion is movably located. The impact device has sufficient torque output and long lifetime. |
| 主权项 |
1. An impact device comprising:
a transmission shaft which has an impacted section, an extending section extending from the impacted section along an axis of the transmission shaft, a first protrusion extending from the impacted section toward a first radial direction, and two first concave surfaces located at two sides of the first protrusion; an impact cylinder which is provided at an inside thereof with a passage for accommodating the impacted section of the transmission shaft, at an outside thereof with two elongated protrusions which are located at two opposite sides of the impact cylinder and extend parallel to the axis, and at two other opposite sides thereof with two first radial holes, the two first radial holes and the two elongated protrusions being alternately arranged along a circumference of the impact cylinder; two first impact pins which are respectively received in the first radial holes, shaped as circular columns extending parallel to the axis of the transmission shaft, and abuttable against the first concave surfaces of the transmission shaft; and a first ring which is sleeved onto the impact cylinder and the first impact pins, and provided at an inside thereof with a first narrow groove and a first wide groove both extending parallel to the axis of the transmission shaft, wherein the first wide groove is wider than the first narrow groove; one of the elongated protrusions is located in the first narrow groove and the other elongated protrusion is movably located in the first wide groove. |
