Electropneumatic impact mechanism
AssigneeHilti Aktiengesellschaft
InventorsErnst-Rudolf Lübkert, Uto Plank, Karin Groth
Life of this patent
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Abstract
An electropneumatic impact mechanism for an electric hand-held power tool, in particular a hammer drill and/or chipping hammer, wherein the impact mechanism has a transmission housing, a guide tube arranged at least partially in the transmission housing, an exciter piston that is movable in the axial direction in the guide tube, a connecting rod coupled to the exciter piston, and an eccentric wheel which is coupled to the connecting rod on one side and is mounted so as to be rotatable with respect to the transmission housing on the other side, wherein the impact mechanism has a bearing body on which the eccentric wheel is mounted rotatably by means of a pair of plain bearings.
Claims19
An electropneumatic impact mechanism for an electric hand-held power tool, the impact mechanism comprising:
- a transmission housing;
- a guide tube arranged at least partially in the transmission housing;
- an exciter piston movable in the guide tube;
- a connecting rod coupled to the exciter piston;
- an eccentric wheel coupled to the connecting rod on one side and mounted so as to be rotatable with respect to the transmission housing on the other side;
- and
- a bearing body, the eccentric wheel being mounted rotatably on the bearing body via a pair of plain bearings;
- wherein the bearing body is configured as a bearing shaft different from the eccentric wheel and the bearing shaft has a collar providing an axial sliding surface for the eccentric wheel.
An electropneumatic impact mechanism for an electric hand-held power tool, the impact mechanism comprising:
- a transmission housing;
- a guide tube arranged at least partially in the transmission housing;
- an exciter piston movable in the guide tube;
- a connecting rod coupled to the exciter piston;
- an eccentric wheel coupled to the connecting rod on one side and mounted so as to be rotatable with respect to the transmission housing on the other side;
- and
- a bearing body, the eccentric wheel being mounted rotatably on the bearing body via a pair of plain bearings;
- wherein the bearing body is configured as a bearing journal integrally with the transmission housing.
An electropneumatic impact mechanism for an electric hand-held power tool, the impact mechanism comprising:
- a transmission housing;
- a guide tube arranged at least partially in the transmission housing;
- an exciter piston movable in the guide tube;
- a connecting rod coupled to the exciter piston;
- an eccentric wheel coupled to the connecting rod on one side and mounted so as to be rotatable with respect to the transmission housing on the other side;
- and
- a bearing body, the eccentric wheel being mounted rotatably on the bearing body via a pair of plain bearings,
- wherein the transmission housing has a closure cover having, on a side facing the eccentric wheel, a retaining lip, a profile of the retaining lip at least partially following a circular path of an eccentric point of the eccentric wheel.
Dependencies are inferred from the claim text.