| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce noise emission while eliminating an adverse effect a machine receives due to exhaust gas. <P>SOLUTION: A hollow ring-shaped part 25 with a top surface wall 22, an under surface wall 23, and a side wall 24 is provided near a center corresponding to a revolution gear wheel 13 in a car body 7 of an undercarriage 1. Through holes 26 and 27 are provided in the inside part of the revolution gear wheel 13 near the center of an upper frame 10 and in the top surface wall 22 of the ring-shaped part 25, respectively, while an exhaust port 29 outward opened is provided in the side wall 24 of the ring-shaped part 25, and a discharge passage bent in an L-shape is formed for discharging exhaust gas and noises released from an engine 18, related equipment, and the like to the outside. <P>COPYRIGHT: (C)2013,JPO&INPIT |
