The rolling scotch yoke mechanism rsym, a variation of the scotch yoke mechanism, is developed in this work. Scotch yoke mechanism the scotch yoke also known as slotted link mechanism is a reciprocating motion mechanism, converting the linear motion of a slider into rotational motion or vice versa. Although there is a strong similarity between the wheel and the pulley, the wheel has been used for transportation since before 3000 bc while the development of the pulley remained. A prototype of scotch yoke mechanism scotch yoke 1. A rotary actuator may be defined as a mechanism that converts linear force into quarterturn torque and is suitable for most valves but is most effective on those of larger sizes. The scotch yoke mechanism converts rotary to linear motion. Novel mechanical mechanisms for the development of. This mechanism is most commonly used in control valve actuators in high pressure oil and gas pipelines. As the discpin rotates, the shaftoblong moves left and right in a sinusoidal motion. Double slider crank chain is a fourbar kinematic chain having 2 sliding pairs and 2 turning pairs such that two pairs of the same kind are adjacent.
The pin p slides in the slot and the yoke oscillates up and. Scotch yoke actuators actuation valve and control ltd. This paper proposes to balance the input torque of scotch yoke mechanisms without any auxiliary linkage just by adding linear springs to the output slider. Pdf design of scotch yoke mechanisms with improved. Bettis cbxseries scotch yoke pneumatic actuator youtube. This work mainly looks into feasibility of scotch yoke rather than conventionally used crank and slider mechanism. Mechanics and machine design, equations and calculators. Aug 21, 2009 the scotch yoke, also spelled scotch yoke and scotch yoke, is a mechanism for converting the linear motion of a slider into rotational motion or viceversa. Shaper using scotch yoke mechanism we are giving supply to the main shaft as we can see that the scotch yoke mechanism is directly fabricated to the main shaft and have same angular velocity as that of mainshaft when the a. This demonstration compares the sliding joint kinematicsthe displacements velocities and accelerationsproduced by the two mechanisms as functions of the common input crank angle.
C motor is started the rotational power is transmitted through the belt drive. Feb 17, 2016 two of the most common which are found in shaping, planning and slotting machines for metal cutting are the scotch yoke mechanism and the whitworth quick return motion. Pdf scotchyoke mechanism for a syringe pump a case study. Pdf designing and fabrication of double acting hacksaw machine. Jul 04, 2018 how to build a simple scotch yoke mechanism cardboard and popsicles sticks duration. Jul, 2019 fabrication of dual side shaper machine using scotch yoke mechanism written by veldi kanakaraju, boda ramesh, manga hymanjali published on 201907 download full article with reference data and citations. Scotch yoke piston actuators are classified as lineartorotary actuators. Nowadays, it is used for pumping highly viscous fluids such as concrete, heavy oils etc.
Fabrication of dual side shaper machine using scotch yoke. Normally it has relatively small capacities and large delivery head and is used. These equations were found through recursive application of equations for. The scotch yoke mechanism is most commonly used in control valve actuators in highpressure oil and gas. The rsym is not a mechanism by rigorous definition because the output position is not uniquely determined by the input position, however has several advantages over other reciprocating mechanisms. Experimental evaluation of a scotchyoke compressor mechanism. Scotch yoke mechanism the scotch yoke mechanism also known as slotted link mechanism is a reciprocating motion mechanism, converting the linear motion of a slider into rotational motion, or vice versa.
The scotch yoke is also known as slotted link mechanism. Pdf input torque balancing through addition of an auxiliary mechanism is a well known way to improve. Design and fabrication of hacksaw machine using scotch yoke. The simplest of the mechanisms, the pulley, is also the earliest mechanism to have been used. The frictional losses between pin and the yoke are neglected.
Join the grabcad community today to gain access and download. Design of scotch yoke mechanisms with improved driving dynamics. When the piston or reciprocating part to directly coupled together for the sliding of yoke including a. The scotch yoke also known as slotted link mechanism is a reciprocating motion mechanism, converting the linear motion of a slider into rotational motion, or vice versa the piston or other reciprocating part is directly coupled to a sliding yoke with a slot that engages a pin on the rotating pa. Basic of scotch yoke mechanism it is one of reciprocating motion mechanism, it should be convert an rotary motion into sliding of linear motion. The rolling scotch yoke mechanism applied to a small air. How to build a simple scotch yoke mechanism cardboard and popsicles sticks duration. Construction, working, detailed view, shaper calculations, analysis. The simple crankslider and the scotch yoke called the donkey crosshead in great britain are two mechanisms for transforming between rotary and linear motion. Unlike a conventional scotch yoke mechanism whose crank pin slides relative to the yoke. It is a simple mechanism, the rotary motion of pin convert into linear motion. It is made of aluminum and consists of a rotary element, called crank, with a graduated disc. Mechanical engg project ideas dual side shaper machine using scotch yoke mechanism updated duration.
The engineering case program originated at stanford university in 1964 with the support of the national science foundation. The heart of the series 98 actuator is the scotch yoke. Design and analysis of dual side shaper using scotch yoke. Design of a scotch yoke mechanism internet archive. Comparing simple crankslider and scotch yoke mechanisms. The scotch yoke mechanism is a reciprocating motion mechanism, converting the linear motion of a slider into rotational motion, or vice versa. Pdf design of scotch yoke mechanisms with improved driving. A shaper is a machine used for shaping metal removal operation on the work piece. This mechanism is used to drive the piston, this system. A nearly ideal twodimensional scotch yoke mechanism was con structed to test a. Pdf designing and fabrication of double acting hacksaw. In this lab report in this lab report u can find the details of scotch yoke mechanism, its working, its applications and its efficiency.
Aim of the project to design and manufacture a working model of scotch yoke mechanism. The scotch yoke is a mechanism for converting the linear motion of a slider into rotational motion or viceversa. How to make motorized scotch yoke mechanism mechanical. The first analysis determines the speed variations when the mechanism is rigidly connected to a motor having a quadratic speed versus torque characteristic. Design and fabrication of power hacksaw and shaper using. The piston or other reciprocating part is directly coupled to a sliding yoke with a slot that engages a pin on the rotating part. In the example below, air supplied at port 2 is released into the chamber and forces the piston towards the central module of the scotch yoke actuator, in turn performing the counterclockwise rotation through the scotch yoke mechanism and opening of the connected valve.
This mechanism is basically a second inversion of double slider crank mechanism. A good place to start is with the mechanism called the scotch yoke which converts a constant rotation into a perfectly sinusoidal motion known as simple harmonic motion. However, the input torque of the scotch yoke mechanism is variable and can be balanced. Scotch yoke mechanism diagram working principle of scotch yoke mechanism. Scotch yoke the wheel revolves at radianssec and the pin forces the yoke to move up and down. Scotch yoke mechanism animation, advantages and application what is scotch yoke mechanism. Two analyses are presented for determining the drive shaft speed variations in a scotch yoke mechanism. Scotch yoke mechanism design equations and calculator. Scotch yoke mechanism is obtained when one of the sliding links of a double slidercrank chain is fixed. The scotch yoke mechanism, mye, designed by edibon, is an example of slidercrank. The advantages of the scotch yoke over a crankshaft include fewer moving parts, smoother operation and more time spent in the dwell position, which in engines can improve efficiency slightly. Design and fabrication of hacksaw machine using scotch yoke mechanism pankaj vidhate, sagar vyavhare, sandip wagh vaibhav bajaj ratnadeep agale nitesh kathar6 1ug scholar, mechanical engineering department, sycet aurangabad, mh,india 2 ug scholar, mechanical engineering department, sycet aurangabad, mh,india. For the application discussed herein, a scotch yoke mechanism has been employed in a line of four cylinder hermetic compressors ranging in. Scotch yoke actuator torque output mechanical engineering.
Until recently, scotch yoke mechanisms have been utilized only in compressors of relatively small capacity. This mechanism converts linear motion into rotational motion. Scotch yoke mechanism is a type of a reciprocating motion. It makes use of a slotted slider based system to convert circular motion into linear motion and vice versa. Design of scotch yoke mechanisms with improved driving. This case study is part of the american society for engineering education asee engineering case library ecl, which can be downloaded in full as a 300mb zip file. The advantage of scotch yoke mechanism over the slider crank mechanism is that it has lesser moving parts and smoother operation. The scotch yoke mechanism, mye, designed by edibon, is an example of slidercrank mechanism. Scotch yoke mechanism project for mech, production. Mar 12, 2019 compact, lightweight and ideally suited for automating ball, butterfly and nonlubricated plug valves, or any quarterturn 90 degree rotating mechanism, the cbxseries is also economical and low. Scotch yoke mechanism animation, advantages and application. The reciprocating part is directly coupled to a sliding yoke with a slot that engages a pin on the rotating part.
A dual side shaping machine for industrial applications. This paper describes about dual side shaper machine using a scotch yoke mechanism which can be used in industries for cutting process. The scotch yoke is a mechanism for converting the linear motion of a slider into rotational motion of a crank or viceversa. Velocity profile of slider of whitworth quick return mechanism using matlab the scotch yoke mechanism is a very simple mechanism for converting rotary motion into reciprocating motion. The slotted link mechanism is used for converting the linear motion of a slider into rotational.
The widest usage of this mechanism is in pumping systems for oil, gas and other liquids. The mechanism in the link i posted would have a variable torque, and i think is a more common mechanism for actuators than the one in the animation you posted. This video shows the demonstration of motorized scotch yoke mechanism piston. The pin placed eccentrically is assumed to be forged or casted along with the scotch to reduce losses. This mechanism is obtained from an inversion of the double slider crank chain. Comparing the values obtained by the equations of motion. Scotch yoke mechanism animation with explanation youtube. In the early 19th century, it was used extensively as a boiler feed water pump. Scotch yoke is a mechanism used to convert rotary motion into sliding motion. Analysis of drive shaft speed variations in a scotch yoke. The grabcad library offers millions of free cad designs, cad files, and 3d models. The scotch yoke mechanism to be consider for more efficient because of the rotational motion to spent more time at high point of it rotate than piston part. Read the second part of my post, and the linked example of a scotch yoke mechanism, but note the difference in where the slide is located.