Reciprocating drive mechanism and electrical tool comprising same

Abstract

A reciprocating drive mechanism for a power tool includes a rotatably mounted transmission shaft that has a first central axis, a spindle with a spindle body, and a counterweight for linearly reciprocating motion under the guide of at least one guiding rod. A wobble plate is mounted on the transmission shaft and includes a first arm and second arms extending in opposite directions. The first arm and second arms are configured to cooperate with the spindle and the counterweight respectively so that, upon rotation of the transmission shaft, the first and second arms of the wobble plate drive the spindle and the counterweight to reciprocate in opposite directions parallel to the second central axis. An angle is formed between the extending direction of the first arm and the second arm and a plane defined by the first central axis and the second central axis.

Description

technical field [0001] The present invention relates to a reciprocating drive mechanism of an electric tool, and to an electric tool including the reciprocating drive mechanism. Background technique [0002] Currently, power tools, especially reciprocating saws with a swing drive, are easier to operate and more compact in size. In order to reduce the vibration of the reciprocating saw during operation, thereby reducing the risk of fatigue damage or being cut by the user when using the reciprocating saw. Counterweights have been used as a balancing mechanism to minimize vibration. [0003] In US Patent No. 22566905 A a portable electric reciprocating saw is disclosed which has dual swing bearings, a front swing bearing and a rear swing bearing respectively. Among them, the swing arm of the front swing bearing drives the mandrel to reciprocate, while the swing arm of the rear swing bearing drives the balance counterweight to reciprocate with a phase deviation of 180° with th...

AI Technical Summary

Problems solved by technology

The structure of this reciprocating saw is simpler and more compact, however, as figure 2 As shown, since the center of gravity 10 of the balance weight 8 is separated from the driving hole 7 by a relatively large distance, an additional torque action is formed between the two, and at the same time, since the center of gravity 10 of the balance weight 8 is separated from the guide rod 11 by a relatively large distance distance, so that additional torque effects are formed between the two, and these torque effects will increase the wear on the balance weight 8, the drive hole 7 and the guide rod 11, resulting in damage to the balance weight 8, the drive hole 7 and the guide rod 11 reduction in service life

In addition, because there is a relatively large distance between the center of gravity 10 of the balance weight 8 and the center of gravity of the mandrel 9, the torque formed between the balance weight 8 and the mandrel 9 is relatively large, which will increase the speed of the reciprocating saw. vibration

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