Gun drill and mode switching mechanism thereof

Abstract

The invention discloses a gun drill and a mode switching mechanism. The gun drill comprises a machine shell, a motor, a reducer casing, a rotatable mode selector switch, a clamping head and a linkage piece; the linkage piece is fixed relative to a gear shifting tooth ring of the reducer casing, the rotatable mode selector switch is rotationally arranged on the reducer casing in a sleeving manner, a cam part is arranged on the rotatable mode selector switch, and the linkage piece is matched with the rotatable mode selector switch; and the linkage piece comprises a matched end, in the rotating process of the rotatable mode selector switch, the cam part is matched with the matched end to drive the linkage piece to axially move along the reducer casing, and the gear shifting tooth ring of the reducer casing is further pushed to axially move along the reducer casing. The mode switching mechanism comprises the above the rotatable mode selector switch and the above linkage piece. The cam part is matched with the matched end, and circumferential motion of the rotatable mode selector switch can be easily switched into axial motion of the gear shifting tooth ring; and in addition, the structure is simple, the stress condition is good, motion is reliable, and the gun drill can be automatically clamped.

Description

technical field [0001] The invention relates to the field of power tools, in particular to a gun drill and a mode switching mechanism thereof. Background technique [0002] With the innovation and progress of technology, the gun drill has been able to automatically clamp and loosen the clamp and replace the drill bit, which has two modes of clamping and working, and can be switched by the corresponding mode switch. Generally, the fixture can be clamped when the gun drill is at high speed. Due to the limitation of the motor of the current gun drill, in order to ensure a high clamping torque, in the clamping mode, the output and input of the reduction box must be at a low speed state. Therefore, it is necessary to adjust the reduction ratio of the reduction box to the required transmission ratio when the collet is clamped or loosened in place in the clamping mode. Generally, the variable speed ring gear of the gun drill moves back and forth along the motor axis. In order to m...

AI Technical Summary

Problems solved by technology

However, this structure is relatively complicated, and at the same time, the stress state of the speed adjustment switch is very bad. During the switching process, the speed adjustment switch is very easy to be deformed and locked.

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