Planet gear driven cam inverse rotation demonstration instrument

Abstract

The invention discloses a planet gear driven cam inverse rotation demonstration instrument. The demonstration instrument comprises a rack consisting of a front rack and a rear rack, wherein a rotating shaft capable of rotating relative to the rack is arranged in a manner penetrating through round through grooves in the front rack and the rear rack; a driving device is located on the rotating shaft between the front rack and the rear rack and used for driving the rotating shaft to rotate; a front cam forward rotating device is arranged on the outer side of the front rack, and a rear cam reverse rotating device is arranged on the outer side of the rear rack. The planet gear driven cam inverse rotation demonstration instrument can demonstrate the working processes of forward and reverse rotation of a cam and can demonstrate the change processes of a pressure angle and a transmission angle when each cam rotates for certain angle each time, is vivid and visual, and can help students better know and master knowledge points. Besides, the demonstration instrument is rotated manually, so that the demonstration instrument can be stopped at any time for observation of the change of the pressure angles and the transmission angles, and the demonstration instrument is quite convenient to use.

Description

technical field [0001] The invention relates to teaching equipment for mechanical principles, which is used for a demonstration device of cam motion in mechanical principles, in particular to a planetary wheel driven cam reversal demonstrator. Background technique [0002] When the cam mechanism is working, both the cam and the follower are moving. In order to draw the contour curve of the cam on the drawing, the reverse method can be used. The principle will be described below by taking the centering tip movable follower disc cam mechanism as an example. [0003] From Figure 1a It can be seen from the figure that when the cam rotates, the real motion of the cam mechanism: the cam rotates counterclockwise around the axis O at a constant angular velocity ω, pushing the follower to reciprocate up and down in the guide path. When the follower is at the lowest position, the cam profile curve contacts the follower at point A, when the cam turns Angle, the radial OA of the cam...

AI Technical Summary

Problems solved by technology

[0006] The principle of the cam reversal method is a very important part of the learning of the cam mechanism in the course of mechanical principles, but at present, it can only be described theoretically in the teaching. Difficult to understand, have great difficulty learning

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