Percussion function switching mechanism of percussion drill

Abstract

The invention relates to a percussion function switching mechanism of a percussion drill and belongs to the technical field of electric tools. The percussion function switching mechanism of the percussion drill comprises a mode adjusting device and a transmission mechanism; an output shaft is connected with a percussion adjusting rack in an axial constraint mode; the percussion adjusting rack is circumferentially constraint in an operating element; the operating element is fixedly connected with an adjusting element, and the adjusting element can rotate relative to a transmission element and is provided with circumferential gears corresponding to a screwing mode, a percussion mode and a drilling mode respectively; the transmission element is supported on a coupling housing in a circumferential restraint mode and can axially move relative to the coupling housing when in a screwing position, and be axially restraint relative to the coupling housing when in percussion and drilling positions; the coupling housing is provided with a percussion gear and a percussion stopping gear which correspond to the percussion mode and the screwing and drilling mode respectively. According to the percussion function switching mechanism of the percussion drill, a percussion stopping structure is arranged on the coupling housing and accordingly is high in strength, meanwhile, the matching dimension chain between the percussion stopping structure and the percussion adjusting rack is greatly shortened, so that errors can reduced, and reliability and service life of function adjustment can be improved.

Description

technical field [0001] The invention relates to a switching mechanism of an impact drill, in particular to an impact function switching mechanism of an impact drill, belonging to the technical field of electric tools. Background technique [0002] It can be seen from the retrieval that the Chinese patent document with application number 201180062023.X discloses an impact function switching mechanism of an impact drill. The impact drill has a mode adjustment device and a drive device, the operating element and the adjustment element are connected in a non-rotatable manner, and the adjustment element and the transmission element are coupled in a screw mode. The transmission element is supported on a housing associated with the transmission mechanism and is axially movable in the screwing mode and axially fixed in the other two modes. The adjustment element and the transmission element are relatively rotationally movable. In addition, the adjustment element has a protruding a...

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Problems solved by technology

[0003] Practice has shown that the disadvantages of the above-mentioned prior art are: the switching between the drilling machine mode and the impact mode is realized through the limit of the activation element on the adjustment element, and the adjustment element is fixed on the operation element, and both the operation element and the interlock on the output shaft There are multiple clearance fit relationships on the assembly relationship between the size chains. The cumulative error plus long-term work will easily cause the activation component on the adjustment element to fail. In the case of a large cumulative error, it will also cause misoperation of function adjustment.

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