Work machine

Abstract

The working machine includes a machine body and an arm device. The arm device includes a boom, an arm, an angle detector, a protection portion, and a hose. The angle detector includes a detection body provided on the boom side, and a lever coupled to the detection body and a member on the arm side and displaced in accordance with relative swing between the boom and the arm. The protection portion includes a cover that covers a displacement region of the lever, and a guide that covers the detection body, the guide having a contour shape smaller than that of the cover and being disposed at a position overlapping the cover as viewed from a direction along a central axis. A passing region through which a hose passes is provided between the arm and the cover and outside the guide.

1 . A working machine comprising:
 a machine body; and an arm device, wherein   the arm device includes:
 a first arm; 
 a second arm configured to swing about a central axis with respect to the first arm; 
 an angle detector configured to detect an angle formed by the first arm and the second arm; 
 a protection portion configured to protect the angle detector; and 
 a hose provided at a coupling portion between the first arm and the second arm, 
   the angle detector includes:
 a detection body provided on the first arm side; and 
 a lever coupled to the detection body and a member on the second arm side and displaced in accordance with relative swing between the first arm and the second arm, 
   the protection portion includes:
 a cover configured to cover a displacement region of the lever; and 
 a guide configured to cover the detection body, the guide having a contour shape as viewed from a direction along the central axis smaller than a contour shape of the cover and being disposed at a position overlapping the cover as viewed from a direction along the central axis, and 
   a passing region through which the hose passes is provided between the first arm or the second arm and the cover and outside the guide.   
     
     
         2 . The working machine according to  claim 1 , wherein
 the guide has an outer peripheral surface having a contour shape viewed from a direction along the central axis being a shape along an arc, and   the passing region is provided along the outer peripheral surface.   
     
     
         3 . The working machine according to  claim 1 , wherein
 the first arm has an arcuate end surface at a tip where the angle detector is provided,   the end surface and the guide are positioned side by side in a direction parallel to the central axis, and   the passing region is provided in a region between the second arm and the cover and outside the guide and the end surface.   
     
     
         4 . The working machine according to  claim 1 , wherein the guide is integrated with the cover and the guide and the cover are detachable from the first arm. 
     
     
         5 . The working machine according to  claim 4 , comprising a bracket for attaching the detection body to the first arm, wherein
 the detection body is disposed inside an outer edge of the bracket when viewed from a direction along the central axis, and   an inner peripheral surface of the guide faces an outer peripheral surface of the bracket.   
     
     
         6 . The working machine according to  claim 1 , wherein
 the first arm includes a bracket to which the detection body is attached,   the guide is integrated with the bracket, and   the cover is separate from the guide and the bracket.   
     
     
         7 . The working machine according to  claim 1 , wherein the cover and the guide are attached to the first arm side in a non-contact state with the angle detector. 
     
     
         8 . The working machine according to  claim 1 , wherein
 the cover includes:
 an outer peripheral wall covering an outside of the displacement region of the lever; 
 an outer wall connected to the outer peripheral wall and covering the angle detector from an outside in a machine body width direction; and 
 an inner wall connected to the outer peripheral wall, disposed inside the outer wall in the machine body width direction, and facing the outer wall, and 
   the inner wall is located outside in a machine body width direction of the hose passing through the passing region.   
     
     
         9 . The working machine according to  claim 8 , wherein
 the outer wall is provided over substantially an entire circumferential region around the detection body of the outer peripheral wall,   the inner wall is provided corresponding to a circumferential part around the detection body of the outer peripheral wall, and   the displacement region of the lever is included in a range in which the inner wall is not provided in the cover.   
     
     
         10 . The working machine according to  claim 9 , wherein a circumferential length of the guide around the detection body is longer than a circumferential length of the inner wall. 
     
     
         11 . The working machine according to  claim 1 , wherein the cover has an arc-shaped outer peripheral wall covering an outside of the displacement region of the lever formed in an arc shape around the central axis.