Cutting edge for work machine, blade for work machine, and work machine

Abstract

A cutting edge has an attachment portion and a wear portion. The attachment portion has a first thickness, which is a maximum value of a thickness between a first surface and a second surface. The wear portion includes a first portion having a third surface contiguous to the first surface and a fourth surface facing away from the third surface, and having a second thickness between the third surface and the fourth surface and smaller than the first thickness, and an edge located opposite to the attachment portion. The second portion extends on the first portion from a portion of the fourth surface toward a side opposite to the third surface, and also extends on the first portion from the edge toward the attachment portion.

1 . A cutting edge for a work machine attached to the work machine, comprising:
 an attachment portion having a first surface and a second surface facing away from each other, and a first thickness being a maximum value of a thickness between the first surface and the second surface; and   a wear portion integrated with the attachment portion,   the wear portion having   a first portion having a third surface contiguous to the first surface and a fourth surface facing away from the third surface, and having a second thickness between the third surface and the fourth surface, the second thickness being smaller than the first thickness, and an edge located opposite to the attachment portion, and   a second portion extending from a portion of the fourth surface of the first portion toward a side opposite to the third surface, and extending from the edge of the first portion toward the attachment portion.   
     
     
         2 . The cutting edge for a work machine according to  claim 1 , wherein the attachment portion has a through hole, and the through hole has a diameter-expanded portion connected to the first surface. 
     
     
         3 . The cutting edge for a work machine according to  claim 1 , wherein the second thickness is fixed from the edge of the first portion to an end of the first portion located closer to the attachment portion. 
     
     
         4 . The cutting edge for a work machine according to  claim 1 , wherein a ratio of the second thickness to the first thickness is 50% or less. 
     
     
         5 . The cutting edge for a work machine according to  claim 1 , further comprising an intermediate portion located between the attachment portion and the wear portion, wherein the intermediate portion has a thickness decreasing from the attachment portion toward the wear portion. 
     
     
         6 . The cutting edge for a work machine according to  claim 1 , wherein the second portion is a reinforcing rib. 
     
     
         7 . The cutting edge for a work machine according to  claim 1 , wherein the second portion configures a recess recessed toward the fourth surface of the first portion with respect to the third surface of the first portion. 
     
     
         8 . The cutting edge for a work machine according to  claim 1 , wherein the second portion reaches the attachment portion. 
     
     
         9 . The cutting edge for a work machine according to  claim 1 , wherein
 the second portion has a first end portion connected to the fourth surface and a second end portion opposite to the first end portion, and   the second end portion has a portion located opposite to the fourth surface with respect to the second surface of the attachment portion.   
     
     
         10 . A blade for a work machine comprising:
 the cutting edge for the work machine according to  claim 1 ; and   a blade body to which the cutting edge is attached.   
     
     
         11 . A work machine comprising:
 the blade for the work machine according to  claim 10 ; and   a body of the work machine to which the blade for the work machine is attached.