Idler guide unit

Abstract

A taper-like block ( 26 ) slides on a slide plate ( 27 ) arranged on a track frame ( 11 ) by screwing an adjusting bolt ( 41 ). A bearing ( 21 ) moves to an upper side of the track frame ( 11 ) via rails ( 23, 24 ) fitted to a first inclined surface ( 26 a ) of the taper-like block ( 26 ). Accordingly, it is possible to adjust a gap (S 2 ) between a slide plate ( 31 ) on a hook portion ( 21 c ) of the bearing ( 21 ) and a slide plate ( 33 ) firmly fixed to a lower surface of the track frame ( 11 ).

1 . An idler guide apparatus having a first guide surface and a second guide surface which are respectively provided in an upper surface and a lower surface of a track frame and form slide surfaces in a radial direction of an idler in a crawler type traveling apparatus, characterized in that 
 an idler yoke rotatably bearing the idler is mounted on the first guide surface provided in the upper surface of the track frame, and    an adjusting mechanism for adjusting a gap between the second guide surface provided in the lower surface of the track frame and a guide plate of the idler yoke facing to the second guide surface is formed in the idler yoke.    
   
   
       2 . The idler guide apparatus according to  claim 1 , wherein 
 the idler yoke is constituted by an idler yoke comprising a taper-like block having a first inclined surface, and a second inclined surface slidably contacted with the first inclined surface and parallel to the first inclined surface, and    the adjusting mechanism is constituted by a mechanism which slides the taper-like block on the first guide surface and displaces the idler yoke in a perpendicular direction to the track frame.    
   
   
       3 . The idler guide apparatus according to  claim 2 , wherein 
 the adjusting mechanism comprises actuating means for sliding the taper-like block on the first guide surface.    
   
   
       4 . The idler guide apparatus according to  claim 3 , wherein 
 the actuating means presses the taper-like block in a downward inclining direction side of the first guide surface, and comprises an adjusting bolt engaged with the idler yoke and a spring for energizing the taper-like block to the adjusting bolt.    
   
   
       5 . The idler guide apparatus according to  claim 3 , wherein 
 the actuating means presses the taper-like block in a downward inclining direction side of the first guide surface, and comprises a cylinder apparatus arranged in the idler yoke and a spring for energizing the taper-like block to the cylinder apparatus.