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Group A Christopher Back Josephashwin Franklin Kwongvoon Wong Chen Lin Windshield Wiper Soft Top Mechanism.

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Presentation on theme: "Group A Christopher Back Josephashwin Franklin Kwongvoon Wong Chen Lin Windshield Wiper Soft Top Mechanism."— Presentation transcript:

1 Group A Christopher Back Josephashwin Franklin Kwongvoon Wong Chen Lin Windshield Wiper Soft Top Mechanism

2 Cascading Four-bar Mechanisms Open Loop Four-bar Configuration - Used in Industrial robots - Usually requires multiple actuators to control motion Pantograph Linkage - Originally used in scaled diagrams - Linkages consist of Parallelograms

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4 Open Loop Four-bar L= 4, J1= 3, J2= 0 DOF = M =3 Pantograph Linkage L= 4, J1= 3, J2= 0 DOF = M = 1

5 Reason for Four-Bar Design Pantograph serves as a locking mechanism Use of Limiting Position simplifies complex motion Parallel linkages prevent further motion when collinear

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7 The four-bar linkage has been show as the simplest possible pin- jointed mechanism Allows for single degree of freedom controlled motion

8 Grashof Condition S+L

9 Tandem system is widely used in the front windshield One Motor runs both wipers Parallelogram linkage translates motion to wipers

10 DOF= 3*(6-1)- 2*7=1 Four and Six-bar is a parallelogram linkage. Duplicate the rotary motion of the driver crank at the driven bar. Most Common Type of Windshield mechanism

11 The coupler of the parallelogram linkage is in curvilinear translation Remaining at the same angle while all points on it describe identical circular paths Crank Rocker Input to Windshield Wiper

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13 Varying ???

14 The slider-crank mechanism Variations of grounding different links Inversion D Window Single Arm

15 DOF = 3*(4-1)-2*4= 1 We can imagine that the coupler link length is very small How is the condition when driver link length change? Diagram of Rear Wiper

16 Flexblade(TM) Wiper.Its life can extend from months to years The four-bar linkage mechanism will still be used in this wiper system for a long time

17 How Windshield Wipers Work. (2006) In: How Stuff Works Available: [2007, October 12]. Norton, R.L. Design of Machinery: An Introduction to the Synthesis and Analysis of Mechanisms and Machines. 3 rd ed. New York, McGraw-Hill Co How soft top convertible works. (2006) In: How Stuff Works Available: [2007, October 12]. Pantographs.(2006) In: Wikipedia The Free Encyclopedia: [2007, October 12].

18 Questions?

19 The crank-rocker system will change to be two crank system

20 Contact points in trains Linkages on locomotives Pushrods mechanism Car door linkages

21 Rear windshield wiper Single application of Four-bar mechanism Similar to How is the difference of Rear wiper?


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