Synopsis on Gear Less Power Transmission

Introduction:

Mechanical Project on Gear less Transmission

Gear-less transmission is a compact and portable equipment, which is skillful and having something in practice in the transmitting power at right angle without manufactured and can be made in less time. This project uses EL-Bow mechanism which is an ingenious link mechanism of slider and kinematic chain principle. This is also called as “gear less transmission mechanism” and is very useful for transmitting motion at right angles.

This mechanism is for transmitting motions at any fixed angle between the driving and driven shaft. The synthesis of this mechanism would reveal that it comprises of a number of pins would be between 3 to 8 the more the pins the smoother the operation.

These pins slide inside hollow cylinders thus formatting a sliding pair

Our mechanism has 3 such sliding pairs. These cylinders are placed in a hollow pipe and are fastened at 120* to each other. This whole assemble is mounted on brackets wooden table. Power is supplied by an electric motor.

WORKING:

In this project rotational motion around an axis usually involves gears, which can quickly become complicated, inflexible and clumsy look. So, instead of using gears this technology elegantly converts rotational motion using a set of cylindrical bars bents to 90 degree, in a clever, simple and smooth process that translates strong rotational force even in restricted spaces.

A gear less transmission is provided for transmitting rotational velocity from an input connected to three bent links. Both the input shaft and housing have rotational axes.

The rotational axes of the input shaft is disposed at an angle of 90 degree with respect to the rotational axes of the housing. As a result, rotation of the input shaft results in a processional motion of the axes of the bent link. The rotary and reciprocating motion of bent link transmit rotation of prime mover to 90 degree without any gear system to an output shaft without gears. The transmission includes the input shaft.

gearless power transmission
gearless power transmission

The working of the mechanism is understood by the diagram. An unused form of transmission of power on shaft located at an angle. Motion is transmitted from driving the driven shaft through the roads which are bent to confirm to the angles between the shafts. These roads are located at in the holes equally spaced around a circle and they are free to slide in & out as the shaft revolves. This type of drive is specially suitable where quite operation at high speed is essential but only recommended for high duty.

The operation of this transmission is apparent by the action of one rod. During a revolution. If we assume that driving shaft “A” is revolving as indicated by arrow the driven shaft “B” will rotate counter clock wise. As shaft “A” turns through a half revolution “C” shown in the inner and most effective driving position slides out of both shafts A & B.

The first half revolution and rod “C” then will be at the top then during the remaining half this rod “C” slide inwards until it again reaches to inner most position, in the meanwhile the other rods have of course passed through the same cycle of movements all rods are successively sliding inwards and outwards.

The right angle transmission drive can be applied also to shafts located at intermediate angle between 0 degree to 90 degree. In making this transmission, it is essential to have holes for a given rod located accurately in the same holes must be equally spaced in radial and circumferential directions, be parallel to each rod should be bent at angle at which the shafts are to be located. If the holes drilled in the ends of the shafts have “blind” or “closed” ends, there ought to be a small vent at the bottom of each rod hole for the escape of air compressed by the pumping action of rods. These holes are useful for oiling to avoid blind holes shaft may have enlarged port of shoulder.

This transmission may be provided centrally and in line with the axes of each shaft and provided with a circular groove at each rod or a cross pin to permit rotation of the shaft about the rod simply active as a retaining device for shipping and handling purpose.

At a time we are showing two applications of this mechanism.

  • As a wood cutting machine, the cutter is attached on the output shaft when motion is transmitted through mechanism to output shaft the shaft will start to rotate at adjusted speed. The speed is adjusted by means of pulley. The cutters will also start to rotate along with the shaft through slot introduces in the table for free rotation of cutter edges in table. Now the feed given to wooden rods or plywood to cut in desire shape and size

  • As an air compressor, the compressor is also introduced in the project, when the pins inside the drilled holes are reciprocates as well as revolves along the axis of cylinder it gives the compressor effect. Among the three pins when first pin goes at inner dead center it sucks the air then it start to move at outer dead center by revolving, It compresses the air against seal and cylinder head disc and does simultaneously by three pins and we can get continue discharge of air the quantity

  • Mechanical seal is defined as a device which seals by virtue of axial contact pressure between two relatively flat surfaces in a plane right angle to the axis of the shaft. The seal used in EL-BOW mechanical compressor is stationary type. It is place between cylinder and cylinder head.

Machine Design:

The general steps to be followed in the designing of the machine are as followed.

  1. Preparation of the statement of the problem indicating the purpose of the machine.

  2. Selection of mechanism to be used.

  3. Selection of the material.

  4. Determining the size of component drawing.

  5. Preparation of component drawing.

  6. Manufacturing and assembling the machine.

  7. Testing of the machine for functioning.

Manufacturing of Parts:

  • Primary shaping: Preliminary shaping of machine components.

  • Machining Process: Final shape of machine components on lathe.

  • Surface finishing: polishing, lapping, filing.

  • Joining: Arc welding

  • Special operation: Lubrication, adjustment.

Applications:

  • It can be used as an extension for a socket wrench.

  • The mechanism is used for multiple spindle drilling operation called “Gang Drilling”

  • Also used for angular drilling between 0 to 90 degree position.

  • Lubrication pump for C.N.C lathe machines.

  • Air blower for electronic and computer machine

  • The EL-BOW mechanism is used for movement of periscope in submarines, In the year 1685 for the famous London tower clock.

  • Driving for all kind of four faced tower clocks.

  • This mechanism is very useful for reaching a drive at a clumsy location

Limitation:

  • Does not work at very low starting torque.

  • Improper hole drilling could pose much problem.

  • Sudden load would cause mechanism breakdown.

  • Links are to be replaced after certain cycle time.

  • Speed ration is always content 1:1.

Future Scope:

  • Torque bearing capacity can be improved.

  • Flexible bent links can be used.

  • Has a bright future in automation and robotics.

  • Can be used in automobile industry in near future.

Conclusion:

  • The model works correctly as per the design.

  • With the help of this system, we can efficiently reduce the cost in power transmission.

  • Further advancement in this technology can be made.

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