Hand-Held Grinding Machine and Method for Assembling a Hand-Held Grinding Machine

Abstract

A hand-held grinding machine includes a grinding device for receiving or forming a grinding means, a drive device, a drive housing, and an interface device operatively connecting the grinding device to the drive device. The interface device includes a connecting housing unit formed separately from the drive housing and the grinding device for at least partially receiving the grinding device, and a docking interface arranged on the drive housing. The connecting housing unit engages around the docking interface in a fixing plane which is perpendicular to an axis of rotation of a drive shaft of the drive device. In the fixing plane, the docking interface includes at least one axial form-fitting element for forming a form fit with the connecting housing unit parallel to the axis of rotation. A projection of the axial form-fitting element along the axis of rotation is at least substantially inside the drive housing.

1 . A hand-held grinding machine comprising:
 at least one grinding device configured to receive or form a grinding apparatus;   a drive device configured to drive the grinding device;   a drive housing, which receives the drive device; and   an interface device configured to operatively connect the grinding device to the drive device, the interface device comprising:
 at least one connecting housing unit formed separately from the drive housing and the grinding device, the at least one connecting housing configured to at least partially receive the grinding device; and 
 a docking interface arranged on the drive housing, 
   wherein the connecting housing unit engages around the docking interface in a fixing plane which is perpendicular to an axis of rotation of a drive shaft of the drive device,   wherein, in the fixing plane, the docking interface comprises at least one axial form-fitting element for forming a form fit with the connecting housing unit parallel to the axis of rotation, and   wherein a projection of the at least one axial form-fitting element along the axis of rotation is at least substantially completely inside the drive housing.   
     
     
         2 . The hand-held grinding machine according to  claim 1 , wherein the axial form-fitting element includes a fixing recess defined in the docking interface. 
     
     
         3 . The hand-held grinding machine according to  claim 1 , wherein the connecting housing unit has at least two main shells, at least one of which comprises a fixing element formed as a sleeve, which is configured to receive a separately formed fixing element. 
     
     
         4 . The hand-held grinding machine according to  claim 1 , wherein the at least one axial form-fitting element includes a docking cross section of the docking interface perpendicular to the axis of rotation that tapers along the axis of rotation in a direction away from the grinding device. 
     
     
         5 . The hand-held grinding machine according to  claim 1 , wherein the at least one axial form-fitting element includes an oblique and/or curved contact surface of the docking interface that runs transversely to the fixing plane and has a form which is complementary to a mating surface of the connecting housing unit. 
     
     
         6 . The hand-held grinding machine according to  claim 5 , wherein the oblique and/or curved contact surface has a radius of curvature of between 5 mm and 15 mm. 
     
     
         7 . The hand-held grinding machine according to  claim 1 , wherein the docking interface comprises at least 10% to 20% of an overall height of the drive housing including the docking interface measured parallel to the axis of rotation. 
     
     
         8 . The hand-held grinding machine according to  claim 1 , wherein the docking interface engages around a bearing element of the drive device in the fixing plane. 
     
     
         9 . The hand-held grinding machine according to  claim 1 , wherein the at least one axial form-fitting element includes a boundary portion of the docking interface at the drive housing that is at least substantially perpendicular to the axis of rotation, the boundary portion having a smaller cross section than the drive housing such that the connecting housing unit is arrangeable at least substantially flush with the drive housing on the docking interface. 
     
     
         10 . The hand-held grinding machine according to  claim 1 , wherein the connecting housing unit has at least two main shells, which are aligned against one another in the fixing plane via at least one tongue and groove connection. 
     
     
         11 . The hand-held grinding machine according to  claim 1 , wherein:
 the drive device includes a drive fan,   the grinding device includes a fan, and   the drive fan and the fan are arranged along the axis of rotation on different sides of the axial form-fitting element.   
     
     
         12 . A method for assembling a hand-held grinding comprising:
 arranging a drive device, which is configured to drive a grinding device that is configured to receive or form a grinding apparatus, in a drive housing of the hand-held grinding machine;   at least partially arranging the grinding device in at least one connecting housing unit, which is formed separately from the drive housing and the grinding device, of an interface device that is configured to operatively connect the grinding device to the drive device;   arranging the at least one connecting housing unit so as to engage around a docking interface of the interface device, which is arranged on the drive housing, in a fixing plane that is perpendicular to an axis of rotation of a drive shaft of the drive device   forming a form fit parallel to the axis of rotation between the connecting housing unit and the docking interface via an axial form-fitting element, which is arranged in the fixing plane, of the docking interface, wherein a projection of the at least one axial form-fitting element along the axis of rotation is at least substantially completely inside the drive housing.   
     
     
         13 . The hand-held grinding machine according to  claim 1 , wherein the at least one axial form-fitting element is configured as a fixing recess and/or an oblique or concave surface. 
     
     
         14 . The hand-held grinding machine according to  claim 2 , wherein the fixing recess extends at least substantially parallel to the fixing plane and is configured to receive a fixing element of the connecting housing unit and/or a separately formed fixing element. 
     
     
         15 . The hand-held grinding machine according to  claim 3 , wherein an overall receiving length of the sleeve corresponds essentially to a length of the separately formed fixing element. 
     
     
         16 . The hand-held grinding machine according to  claim 8 , wherein the bearing element is configured to rotatably mount a gear mechanism element of the interface device and/or the drive shaft. 
     
     
         17 . The hand-held grinding machine according to  claim 10 , wherein the tongue and groove connection is curved. 
     
     
         18 . The method according to  claim 12 , wherein the at least one axial form-fitting element is configured as a fixing recess and/or an oblique or concave surface.