Noise silencer for construction equipment

Abstract

A noise silencer for construction equipment is used to minimize outward propagation of noises generated from an engine room. The noise silencer is mounted in air intake and/or discharge openings of an engine room, and includes a frame mounted in the one of the air intake and discharge openings of the engine room, and noise damping members fixed to the frame at uniform intervals, and each including a first member, which is disposed inside the engine room in a horizontal direction such that cooling air introduced from outside to inside of the engine room by operation of a cooling fan smoothly flows, and a second member, which is integrally formed with the first member and is disposed outside the engine room so as to be inclined upwardly at a predetermined inclination.

1 . A noise silencer for construction equipment, which reduces noises propagated through air intake and discharge openings of an engine room of the construction equipment, the noise silencer comprising:
 a frame mounted in at least one of the air intake and discharge openings of the engine room; and   noise damping members fixed to the frame at uniform intervals, and each including a first member, which is disposed inside the engine room in a horizontal direction such that cooling air introduced from outside to inside of the engine room by operation of a cooling fan smoothly flows, and a second member, which is integrally formed with the first member and is disposed outside the engine room so as to be inclined upwardly at a predetermined inclination.   
   
   
       2 . The noise silencer of  claim 1 , wherein the first member includes a high-frequency sound absorbing material absorbing high-frequency sound, and the second member includes a low-frequency sound absorbing material absorbing low-frequency sound. 
   
   
       3 . The noise silencer of  claim 1 , wherein the first member includes a low-frequency sound absorbing material absorbing low-frequency sound, and the second member includes a high-frequency sound absorbing material absorbing high-frequency sound. 
   
   
       4 . The noise silencer of  claim 1 , wherein the first and second members have free ends of semi-circular and quadrilateral cross sections respectively, in order to reduce air resistance on coming into contact with the cooling air introduced into the engine room through the air intake opening. 
   
   
       5 . The noise silencer of  claim 1 , wherein the first and second members have free ends of triangular and quadrilateral cross sections respectively, in order to reduce air resistance on coming into contact with the cooling air introduced into the engine room through the air intake opening. 
   
   
       6 . The noise silencer of  claim 1 , wherein the first and second members have free ends of quadrilateral and semi-circular cross sections respectively, in order to reduce air resistance on coming into contact with the cooling air introduced into the engine room through the air intake opening. 
   
   
       7 . The noise silencer of  claim 1 , wherein the first and second members have free ends of quadrilateral and triangular cross sections respectively, in order to reduce air resistance on coming into contact with the cooling air introduced into the engine room through the air intake opening. 
   
   
       8 . The noise silencer of  claim 1 , wherein the first and second members have free ends of semi-circular cross sections, in order to reduce air resistance on coming into contact with the cooling air introduced into the engine room through the air intake opening. 
   
   
       9 . The noise silencer of  claim 1 , wherein the first and second members have free ends of quadrilateral cross sections, in order to reduce air resistance on coming into contact with the cooling air introduced into the engine room through the air intake opening.