Autonomous travel-type cleaner

Abstract

Self-travelling vacuum cleaner ( 10 ) has body ( 20 ) having suction port ( 101 ), drive unit ( 30 ), and an electric fan. Since suction port ( 101 ) is disposed in a maximum width part of body ( 20 ) closer than drive unit ( 30 ), self-travelling vacuum cleaner ( 10 ) can suck a trash on a corner in a target region to be cleaned easily and can move from the corner to another area quickly.

What is claimed is: 
     
         1 . A self-travelling vacuum cleaner comprising:
 a body having a suction port;   a drive unit which, in operation, moves the body; and   an electric fan configured to suck air inside of the body, and   a caster provided on a bottom side of body,   wherein the body has two apex parts which define a maximum width of the body,   the suction port is disposed at a part having the maximum width of the body on a bottom side of the body,   the suction port is disposed at a part closer to the part having the maximum width of body than the drive unit, and   the caster is disposed at a part farther from the part having the maximum width of body than the drive unit.   
     
     
         2 . The self-travelling vacuum cleaner according to  claim 1 ,
 wherein the caster is disposed at a rear side of the body farther than the drive unit with respect to the part having the maximum width of the body.   
     
     
         3 . The self-travelling vacuum cleaner according to  claim 1 , further comprising a side brush disposed on the bottom side of the body,
 wherein a part of a rotation track of the side brush overlaps the part having the maximum width of the body.   
     
     
         4 . The self-travelling vacuum cleaner according to  claim 1 ,
 wherein each of angles formed between a first tangent and a second tangent and between a first tangent and a third tangent is an acute angle, wherein the first tangent is a tangent of an outer periphery of the body in a plane view and is parallel to a line connecting apexes of the two apex parts of the body, and the second tangent is another tangent of the outer periphery of the body in the plane view and makes contact with the outer periphery at a point on the rear side of the body relative to the line connecting the apexes of the two apex parts of the body, and the third tangent is still another tangent of the outer periphery of the body in the plane view and makes contact with the outer periphery at another point at the rear side of the body relative to the line connecting the apexes of the two apex parts of the body.   
     
     
         5 . The self-travelling vacuum cleaner according to  claim 1 ,
 wherein an outer peripheral surface has a curved surface with which the first tangent makes contact, the curved surface being protruded outwardly in the plane view of the body,   each of the two apex parts of the body has a round shape, and   a curvature of the curved surface of the outer peripheral surface of the body is smaller than curvatures of the round shapes of two apex parts.   
     
     
         6 . The self-travelling vacuum cleaner according to  claim 1 , further comprising a charge terminal disposed at a part closer to the part having the maximum width of the body than the drive unit. 
     
     
         7 . The self-travelling vacuum cleaner according to  claim 1 , further comprising a power source unit disposed at a part farther from the part having the maximum width of the body than the drive unit. 
     
     
         8 . The self-travelling vacuum cleaner according to  claim 1 , wherein the drive unit has a first drive unit and a second drive unit, each of the first drive unit and the second drive unit has a suspension spring, and elastic modulus of one of the suspension springs is set to be larger than elastic modulus of the other suspension spring. 
     
     
         9 . The self-travelling vacuum cleaner according to  claim 1 , further comprising a main brush disposed in the suction port and a brush driving motor configured to apply torque to the main brush,
 wherein the body has a plurality of suspension springs,   the drive unit has a first wheel and a second wheel,   the second wheel is disposed at a part farther from the brush driving motor than the first wheel, and   elastic modulus of one of the plurality of suspension springs which is configured to apply reaction force to the first wheel is larger than elastic modulus of another of the plurality of suspension springs which is configured to apply reaction force to the second wheel.