Handheld power tool with air-guiding element

Abstract

A handheld power tool, including a housing wall and a fan device with an air intake and an air outlet in the housing wall. The fan device has an air guide, and an outflow space is delimited between, on the one hand, the housing wall at the air outlet and, on the other hand, an outflow side of the air intake, as well as laterally by a first surface contour and by a second surface contour of the air guide. The first surface contour and the second surface contour each extend from the housing wall to the outflow side of the air-intake means, and the air-guiding element is shaped in such a way that the size of the cross-sectional surface of the outflow space increases continuously crosswise to the outflow direction of the air intake in the outflow direction.

1 . A handheld power tool comprising:
 a housing wall; and   a fan device having an air intake having an outflow side and outflow direction and having an air outlet in the housing wall, the fan device having an air guide, the air guide having a first surface contour and a second surface contour;   the housing wall at the air outlet, and the outflow side of the air intake, delimiting therebetween an outflow space, the outflow space delimited laterally by the first surface contour and the second surface contour of the air guide, the first surface contour and the second surface contour each extending from the housing wall to the outflow side of the air intake, the air guide shaped in such a way that a size of the cross-sectional surface of the outflow space increases continuously crosswise to the outflow direction as a distance from the outflow side in the outflow direction increases.   
     
     
         2 . The handheld power tool as recited in  claim 1  wherein the first surface contour and the second surface contour each extend from the housing wall to the outflow side of the air-intake to leave a gap between the air guide and the outflow side. 
     
     
         3 . The handheld power tool as recited in  claim 1  wherein the air guide is shaped in such a way the size of the cross-sectional surface increases continuously in a partial area of the outflow space. 
     
     
         4 . The handheld power tool as recited in  claim 1  wherein the air guide is shaped in such a way that the cross-sectional surface has a first value in a first area adjacent to the air intake and has a second value greater than the first one in a second area adjacent to the air outlet. 
     
     
         5 . The handheld power tool as recited in  claim 1  wherein, relative to the outflow space, the first surface contour follows a path laterally curved outwards. 
     
     
         6 . The handheld power tool as recited in  claim 1  wherein, relative to the outflow space, the second surface contour has a curved path with a segment laterally curved outwards and a further segment laterally curved inwards. 
     
     
         7 . The handheld power tool as recited in  claim 6  wherein the further segment extends from the housing wall in the direction of the air intake and, towards the air intake, to make the transition to the segment laterally curved outwards. 
     
     
         8 . The handheld power tool as recited in  claim 1  wherein the air guide has a first housing extension and a second housing extension that both taper from the housing wall towards the air intake. 
     
     
         9 . The handheld power tool as recited in  claim 8  wherein the first housing extension forms an axial edge perpendicular to the outflow direction. 
     
     
         10 . The handheld power tool as recited in  claim 8  wherein a first side of the first housing extension facing the outflow direction forms the first surface contour, while a side of the second housing extension facing away from the outflow direction forms the second surface contour. 
     
     
         11 . The handheld power tool as recited in  claim 1  further comprising a part proximal to a user and a further part distal to the user, the part and further part being joined to each other via a fastener, the fan device located between the part and the further part, the air-guide physically surrounding the fastener, at least on a side facing the air intake. 
     
     
         12 . The handheld power tool as recited in  claim 10  wherein the fastener has a first connection, the first surface contour passes the first connection tangentially in a fastening area. 
     
     
         13 . The handheld power tool as recited in  claim 12  wherein the first connection is a screw connection. 
     
     
         14 . The handheld power tool as recited in  claim 12  wherein the air outlet is configured in the form of a number of openings distributed along the housing circumference, the air guide having a third housing extension tapering from the housing wall towards the air intake, while forming an axial edge that lies perpendicular to the outflow direction, the third housing extension, together with the first housing extension and the second housing extension, forming three lateral outflow spaces. 
     
     
         15 . The handheld power tool as recited in  claim 12  wherein the third housing extension of the air guide rises above a barrier. 
     
     
         16 . The handheld power tool as recited in  claim 1  wherein the air intake is a radial fan and the air guide defines a multicomponent spiral housing. 
     
     
         17 . The handheld power tool as recited in  claim 1  wherein the outflow space is delimited, on the one hand, axially by an air-guiding wall and, on the other hand, by a position-shielding wall.