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Experimental teaching aid for epicyclic gear train

A kind of technology of turnover wheel system and teaching aids, applied in the field of teaching tools, can solve problems such as difficulty for students to fully understand

Inactive Publication Date: 2016-05-25
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The teaching content of the positive and negative sign mechanism of the epicyclic gear train and the calculation formula of the transmission ratio is very abstract, and it is difficult for students to fully understand only relying on the teacher's oral expression
Moreover, there is still no intuitive teaching tool that can demonstrate the transmission ratio formula and verify the transmission ratio calculation formula in the current teaching.

Method used

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  • Experimental teaching aid for epicyclic gear train
  • Experimental teaching aid for epicyclic gear train
  • Experimental teaching aid for epicyclic gear train

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] figure 1 It is a structural schematic diagram of the epicyclic train experimental teaching aid in Embodiment 1 and Embodiment 2 when the epicyclic train is a minus sign mechanism.

[0039] figure 2 It is a structural schematic diagram of the epicyclic gear train experimental teaching aid in Embodiment 1 and Embodiment 2 when the epicyclic gear train is the first positive sign mechanism.

[0040] image 3 It is a structural schematic diagram of the epicyclic gear train experimental teaching aid in Embodiment 1 and Embodiment 2 when the epicyclic gear train is the second positive sign mechanism.

[0041] Such as figure 1 , figure 2 with image 3 As shown, the epicyclic train experimental teaching aid 50 has an epicyclic train, an input unit, and a data acquisition and display unit.

[0042] Epicyclic gear train comprises: large sun gear 1, first small sun gear 22, second small sun gear 20, third small sun gear 7, first planetary gear 2, second planetary gear 3, th...

Embodiment 2

[0061] When the large sun gear 1, the first small sun gear 22 and the first planetary gear 2 are in the meshing state in the epicyclic gear train experimental teaching aid 50 in Embodiment 1, the epicyclic gear train is a negative sign mechanism, and it is a 2k-H type Epicyclic gear train, then the calculation formula of the transmission ratio of the epicyclic gear train should be: i 122 H =(n 22 -n H ) / (n 1 -n H )=(-1) 1 Z 1 / Z 2 ;

[0062] converted into (n 22 / n H -1) / (n 1 / n H -1)=(-1) 1 Z 1 / Z 2 ;

[0063] Let X=n 22 / n H ,Y=n 1 / n H ;

[0064] Get (X-1) / (Y-1)=-Z 1 / Z 2 .

[0065] Among them, n 22 is the rotational speed of the first small sun gear 22, n 1 is the rotational speed of the big sun gear 1, n H is the rotational speed of the second flange 5; then X is the rotational speed ratio between the first small sun gear 22 and the second flange 5, and Y is the rotational speed ratio between the large sun gear 1 and the second flange 5. Z 1 ...

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Abstract

The invention provides an epicyclic gear train experiment training aid. The epicyclic gear train experiment training aid is characterized by comprising an epicyclic gear train, an input unit and a data collection and display unit. The epicyclic gear train is provided with a large sun gear, a first small sun gear, a second small sun gear, a third small sun gear, a first planet gear, a second planet gear, a third planet gear and a planet carrier. The third small sun gear is connected with the large sun gear through a first sliding mechanism, the first planet gear is connected with the second planet gear through a second sliding mechanism, the movement of the two sliding mechanisms can drive the relevant gears, the meshing state of the gears in the epicyclic gear train can be changed, and therefore the epicyclic gear train is made to be switched between a negative sign mechanism and two positive sign mechanisms. The epicyclic gear train experiment training aid can demonstrate switching of the epicyclic gear train between the negative sign mechanism and the positive sign mechanisms and verify a transmission ratio computational formula.

Description

technical field [0001] The invention relates to an experimental teaching aid for an epicyclic wheel train, which belongs to the field of teaching tools. Background technique [0002] In the teaching of mechanical design principles, the epicyclic gear train is an important and difficult teaching content. [0003] The transmission ratio of the epicyclic gear train cannot be directly calculated. It is necessary to use the principle of relative motion to transform the epicyclic gear train into an imaginary fixed-axis gear train, and then use the formula for calculating the gear ratio of the fixed-axis gear train to calculate the transmission ratio of the epicyclic gear train. The imaginary fixed-axis gear train obtained through conversion is called a conversion mechanism or a conversion gear train. If the transmission ratio of an epicyclic gear train conversion mechanism is positive, then the epicyclic gear train is a positive sign mechanism; otherwise, it is a negative sign me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09B25/02
Inventor 杨槟如朱大业刘月韦浩生钱炜朱坚民施小明
Owner UNIV OF SHANGHAI FOR SCI & TECH
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