Pumping device and method for conveying viscous media, in particular adhesives

A pumping device (1, 1a) for conveying a viscous medium, the pumping device comprising

• a cylinder unit (20) and a piston unit (22), which is at least partially contained within the cylinder unit (20), wherein the cylinder unit (20) and the piston unit (22) together form a conveying means (2), which operates according to the reciprocating piston principle;
• at least one drive shaft (7) being in communication with a motor (50), wherein the cylinder unit (20) and the piston unit (22) are rotationally movable about a common axis via the drive shaft (7);
• and
• force guide (38) being mechanically coupled to the conveying means (2), which force guide (38) converts the rotating movement of the conveying means (2) into an alternating forward and return stroke of the piston unit (22) for the purpose of pumping a viscous medium,
• wherein the piston unit (22) and at least one connecting rod unit (19) are directly mechanically coupled with each other via a bearing journal connection (17), and
• wherein the forward and return strokes of the piston unit (22) are effectable via the connecting rod unit (19), which is eccentrically movable via an adjustment mechanism (30) and which has a mechanical coupling to the conveying means (2).