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# DESIGN OF TRANSMISSION SYSTEM PDF

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Download Design of Transmission Systems By Dr. V. Vijayakumar, Lakshmi Publications – The book “Design of Transmission Systems” for Engineering and. [PDF] ME Design of Transmission Systems (DTS) Books, Lecture Notes, 2marks with answers, Important Part B 16marks Questions, Question Bank &. SL. NO. CONTENT. PAGE NO. 1. Design Of Transmission Systems For Flexible Elements. 5. Selection Of V Belts And Pulleys. 5. Selection Of Flat Belts.

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BT-5 15 Explain what the ray diagram of gear box indicates. BT-4 16 Formulate the general structural formula for gear box design. BT-6 17 List the application of speed reducer. BT-1 18 Define gear box. BT-1 19 Classify the types of speed reducer unit. BT-3 20 Illustrate ray diagram for a six speed gear box. Design the six speed gear box is to provide the speeds in the range of to rpm and transmit a power of 5 kW at rpm. Draw the speed diagram and kinematics diagram. Determine the number of teeth module and face width of all gears, assuming suitable materials for the gears.

Design a 9 speed gear box for the following data.

## Design of Transmission System

Minimum speed: Using standard step ratio, draw the speed diagram, kinematic layout. Also find the number of teeth on each gear. Design a nine speed gear box for a machine to provide speeds ranging from to rpm.

The input is from a motor of 5 kW at rpm. Assume any alloy steel for the gear. Design 12 speed gear box for a minimum speed of rpm and a maximum speed of rpm. The input speed of motor is rpm. Draw the speed diagram, kinematic diagram and indicate the number of teeth on each gear.

Design the layout of a 12 speed gear box for a milling machine having an output of speeds ranging from to rpm. Power is applied to the gear box from a 5kW induction motor at rpm. Choose standard step ratio and construct the speed diagram. Decide upon the various reduction ratios and number of teeth on each gear wheel sketch the arrangement of the gear box.

Design the headstock gear box of a lathe having nine spindle speeds ranging from 50 to rpm. The power of the machine may be taken as 6 kW and speed of the motor is rpm. Minimum number of teeth on the gear is to be Draw the ray diagram and kinematic lay out of a gear box for an all geared headstock of a lathe.

The maximum and minimum speeds are to be and 63 rpm respectively. The number of steps is 12 and drive is from a 3 kW electric motor running at rpm.

Draw speed diagram and a kinematic arrangement of the gear box showing the number of teeth in all the gears. The spindle of a pillar drill is to run at 12 different speeds in the range of rpm and rpm. Design a three stage gear box with a standard step ratio. The gear box receives 5KW from an electric motor running at rpm. Sketch the layout of the gear box, indicating the number of teeth on each gear. Also sketch the speed diagram.

Design a 16 speed gear box for the following data. The input is from a 5KW, rpm motor. BT-1 9 Integrate the desirable properties of lining materials frictional surface. BT-6 10 Describe the important properties of friction material to be used for clutches BT-2 11 Explain self-locking brakes BT-5 12 Explain self energizing brake BT-5 13 Classify the different types of brakes BT-3 14 List few properties of brake friction materials.

BT-1 15 Differentiate clutch and brake. BT-3 20 List the advantages and applications of multi-plate clutch. A single plate sketch, effective on both sides, is required to transmit 25 KW at rpm. Determine the outer and inner diameter of frictional surfaces if the coefficient of friction is 0.

Determine i the face width required and ii the axial spring force necessary to engage the clutch. A plate clutch with maximum diameter 60mm has maximum lining pressure of 0.

Find inside diameter and spring force required to engage the clutch. Springs with spring index 6 and material spring steel with safe shear stress MPa are used. Find the diameters if 6 spring are used. A multi disk clutch consists of five steel plates and four bronze plates.

The inner and outer diameters of friction disks are 75mm and mm respectively. The coefficient of friction is 0. Assuming the uniform wear theory, calculate i the required operating force, and ii power transmitting capacity at rpm. A plate clutch has 3 discs on the driving shaft and 2 discs on the drive shaft, providing 4 pairs of contact surfaces. The OD of contact surface is mm and ID is mm.

A multi disc wet clutch is to be designed for a machine tool driven by an electric motor of Space restrictions limit the outside disc diameter to mm. Determine the appropriate value of inside diameter, total number of discs and clamping force. An engine developing 45kW at rpm id fitted with a cone clutch built inside the fly wheel.

The cone has a face angle of The normal pressure on the clutch face is not exceeded 0. Determine i The face width required ii the axial spring force necessary to engage the clutch. A single block brake, the diameter of drum is mm and the angle of contact is 90o, the operating force of N is applied at the end of lever which is at mm from the centre of the brake block.

Determine the torque that may be transmitted. Fulcrum is at mm from the centre of brake block with an offset of 50mm from the surface of contact. A mm radius Brake drum contacts a single shoe as shown in figure -1and resists a torque of Nm at rpm. The co-efficient of friction is 0.

The layout of a double block brake is shown in figure The brake is rated at N-m at rpm. The drum diameter is mm. Determine i The spring force S required to set the brake ii Width of shoes iii Which shoe will have greater rate of wear? An internal expanding shoe brake has the following dimensions: Each shoe subtends an angle of 90 at the drum Centre. If the braking force is N and the coefficient of friction is 0. Assume the reaction between the brake shoes and the drum passes through the point bisects the contact angle.

## UNIT-II SPUR GEARS AND PARALLEL AXIS HELICAL GEARS

Also assume that forces exerted by the cam ends on the two shoes are equal. MEDesign of Transmission Systems. Flag for inappropriate content. Related titles. Ramanamurthy, S. Jump to Page. Search inside document.

BT-2 www. FIG-1 www. FIG-2 Mohan Prasad. Diameter of rolling pulley is 1.

Design a flat belt drive to transmit 15 KW at rpm from an engine to line shaft at rpm. The centre distance between the pulleys is 2 m. The diameter of engine pulley is mm.

A flat belt drive is required to transmit 12 KW from a motor running at rpm. The belt is 12 mm thick and has mass density of 0. Permissible stress in the belt not to exceed 2. Diameter of driving pulley is mm whereas the speed of driven pulley is rpm. The two shafts are 1.

Determine the width of the belt. Design a suitable V-belt for a centrifugal pump running at rpm is to be driven by KW motor at rpm. The drive is to work at least 20 hours every day. Centre distance is 1. Design a V-belt drive to transmit 10kW at rpm.

The speed ratio is 3. Centre distance between the pulleys is mm and the drive is crusher. Design a V-belt drive and calculate the actual belt tension and average stress for the following data. A truck equipped with 9. The driving sprocket runs at rpm and driven sprocket at rpm with a centre distance of approximately mm.

A roller chain drive is used between a driver shaft running at rpm and a driven shaft running approximately at rpm. The power transmitted is 15KW. The centre distance is approximately mm and the chain tension can be adjusted by moving the motor in the rails. Design the drive. BT-5 7 Explain the interference in gears? BT-4 8 Classify the main types of gear tooth failure? BT-3 9 Explain the requirement of gear material. BT-5 10 Integrate the materials commonly used for gears. BT-6 11 Differentiate involute and cycloid profiles BT-4 12 Integrate the common profiles used for gear tooth.

BT-6 13 Illustrate interchange ability of gears. BT-3 14 Illustrate herringbone gear and its application. BT-2 17 List the advantages of Spur Gears. BT-1 18 List the disadvantage of Spur Gears.

BT-1 19 List the advantages of Helical Gears. BT-1 20 List the disadvantages of Helical Gears. Design a pair of straight spur gear drive for a stone crusher, the gears are made of C40 steel. The pinion is to transmit 30 KW at rpm. The gear ratio is 3. Design a spur gear pair to transmit Speed reduction ratio is 2.

Material for pinion and wheel are C15 steel and cast iron grade 30 respectively.

## [PDF] Design of Transmission Systems By Dr. V. Vijayakumar, Lakshmi Publications Book Free Download

Take pressure angle and working life of gear is 10, hours. Design a spur gear drive required to transmit 45 KW at pinion speed of rpm. Ans: Link or hoisting chains are widely used In low capacity machines such as hoists, winches and hand operated cranes as the main lifting appliances, and As slings for suspending the loas from hook or other device.

Distinguish short ling and long link chains. Department link chains. What is chordal action in chain drives? Ans: Chordal action results in a pulsating and jerk motion of a chain. In order to reduce the variation in chain speed, the number of teeth on the sprocket should be increased.

## ME6601-Design of Transmission Systems.pdf

In chain drives, the sprocket has odd number of teeth and the chain has even number of links. Ans: Reason: To facilitate more uniform wear, ie. What is a silent chain? In what situations, silent chains are preferred? Ans: Inverted tooth chains are called silent chains because of their relatively quiet operation. Silent Drives are preferred for high-power, high-speed, and smooth operation. What are the possible ways by which a chain drive may fail? It is required to select s flat-belt drive for a fan running at r.

The belt drive is open-type and space available for a centre distance of 2m approximately. The diameter of a driven pulley is mm. A flat belt is required to transmit 35kW from a pulley of 1. Determine taking centrifugal tension into account, width of the belt required. It is given that the belt thickness is 9. Design of cost iron pulley to transmit 20kW at r. The diameter of the pulley has four arms of elliptical cross-section with major axis twice the minor axis. The coefficient of friction between the belt and the pulley surface is 0.

The allowable belt tension is not be exceed N in 10 mm width. A truck equipped with a 9.

## COLLEGE OF ENGINEERING AND TECHNOLOGY PALLADAM ROAD, POLLACHI - 642 002

The driving sprocket runs at r. Select the roller chain. Assume the data of example 4. Department radius: v tooth side radius; vi tooth width; and vii tooth side relief. Design a V-grooved pulley of a V-belt drive to transmit Design the silent chain. Design a chain drive to actuate a compressor from a 10kW electric motor at rpm.

The compressor speed is to be rpm. Minimum centre distance should be 0. Motor is mounted on the auxiliary bed. What are the advantages of toothed gears over the other types of transmitted systems?

The size of the gears in metric system are usually specified by their Ans: Module 3. Back lash for spur gears depends on which two factors. Module and 2. Pitch line velocity. Define transmission ratio with reference to spur gears? Ans: It is the ratio of speed of driving gear to the speed of the driven gear.

Define module. Ans: It is the ratio of the pitch circle diameter to the number of teeth.

State the conditions of correct gearing or state the law of gearing. Ans: The law of gearing states that for obtaining a constant velocity ratio, at any instant of teeth the common normal at each of contact should always pass through a pitch point, situated on the line joining the centres of rotation of the pair of mating gears.

AGMA stands for what? What are the common forms of gear tooth profile? Involute tooth profile, and 2. Cycloidal tooth profile. The commonly used gear tooth profile is Ans: 20 involute system Define pitch circle with reference to spur gears. Ans: Pitch circle is an imaginary circle which by pure rolling action, would give the same motion as the actual gear.

What are the materials used for gear manufacturing? Metallic gears: Steel, cast iron, and bronze. Non-metallic gears: Wood, row hide, compressed paper and synthetic resins. Why is pinion made harder than gear? Ans: Because the teeth of pinion undergo more number of cycles than those of gear and hence quicker wear. List out the various methods of manufacturing a gear. Gear milling. Gear generating i Gear hobbing; ii Gear shaping. Gear moldingi Injection molding; ii Die casting; iii Investment casting.

What are the main types of gear tooth failure? Tooth breakage due to static and dynamic loads 2. Tooth wear or surface deterioration a Abrasion; b pitting; and c Scoring or seizure.

Who do you prefer helical gears than spur gears? Ans: Helical gears produce less noise than spur gears. Helical gears have a greater load capacity than equivalent spur gears.

Where do we use helical gears? Ans: Helical gears are commonly used in automobiles, turbines, and high speed applications. What is the major disadvantage of single helical gear? How can you overcome that difficulty? Ans: Single helical gears are subjected to axial thrust loads. Department This axial thrust loads can be eliminated by using double helical i. What helix angle is adopted for a double helical gear?

Ans: 45 In helical gears, the right hand helixes on one gear will mesh gear. Ans: Left hand helixes on the other A pinion with 25 teeth and rotating at r. The module is 4mm. Calculate the centre distance between the gears. A train of spur gears is shown in fig.

Pinion 1 runs at r. The teeth are cut on the 20full-depth system and have a module of 2. The number of teeth on gears 1,2 and 3 are 20,50 and 30 respectively. Calculate: i ii The torque on each gear shaft, and The components of gear tooth forces. Also draw a free body diagram of gear 2 showing all the forces which act upon it and determine the reaction on the idle gear shaft.

Referring to fig. Gear B is an idler and gear C is the driven gear. The teeth are 20 full depth. The pitch circles are shown in fig. Determine i ii iii The torque each shaft must transmit. The tooth load for which each gear must be designed, and The force applied to the idler shaft as a result of the gear tooth loads. NO:Q 16 Q. Gear 1 is the driving gear and transmits 5kW power at r. The number of teeth on gears 1,2,3 and 4 are 20,50, 30 and 60 respectively. The module for all gears is 4mm.

The gears have a 20 full depth involute profile. Calculate the tangential and radial components of the tooth force between: i ii Gears 1 and 2, and Gears 3 and 4. Department 11 6. A train of spur gears with 20 full depth involute teeth is shown in fig. Gear 1 is the driving gear and transmits 50kW power at r.

The number of teeth on gears 1,2,3 and 4 are 30,60,25 and 50 respectively, While the module for all gears is 8mm. Gears 2 and 3 are mounted on the same shaft. Gear 1 is rotating in a clockwise direction when seen from the left side. Calculate : i the tangential and radial components of tooth forces between gear 1 and 2, and gear 3 and 4: and ii Draw a free body diagram of force acting on each gear.BT-4 15 Explain the chordal actions in chain drive.

Design a nine speed gear box for a machine to provide speeds ranging from to rpm. State true or false and justify. A roller chain drive is used between a driver shaft running at rpm and a driven shaft running approximately at rpm.

Pressure angle is 20 degree. Also sketch the spur gear drive. BT-6 13 Illustrate interchange ability of gears. Design the worm gear drive and determine the power loss by heat generation of Hardened steel worm rotates at rpm and transmits 12 KW to a phosphor bronze gear with gear ratio of Ans: When the moment of applied force F.

BT-2 6 Explain undercutting in gears.

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