single plate ckutch

DESIGN MODELING AND ANALYSIS OF SINGLE PLATE CLUTCH : 

DESIGN MODELING AND ANALYSIS OF SINGLE PLATE CLUTCH By DHEERAJ CHAND. V UNDER THE GUIDANCE OF MR P.V.DURGA PRASAD (ASSO. PROFESSOR .DEPT OF MECH .ENGG.) D.R.K INSTITUTE OF SCIENCE AND TECHNOLOGY BOWREMPET, HYDERABAD 1/18

OVERVIEW : 

OVERVIEW ABSTRACT INTRODUCTION REQUIREMENTS OF CLUTCH MATERIALS USED FOR FRICTION LINING TYPES OF CLUTCHES SINGLE PLATE CLUTCH DESIGN CALCULATIONS INTRODUCTION TO CATIA 2/18

ABSTRACT : 

ABSTRACT A single plate clutch consists of a clutch plate whose both sides are faced with a frictional material. It is mounted on the hub. The pressure plate is mounted inside the clutch body which is bolted to the flywheel. The pressure plate pushes the clutch plate towards the flywheel by means of springs (arranged radially) The aim of the project is to design, model a single plate clutch and perform static & Thermal analysis by applying frictional force and temperatures produced by friction Modeling of component is done in catia soft ware ANSYS is general-purpose finite element analysis (FEA) software package. 3/18

INTRODUCTION : 

INTRODUCTION A Clutch is a machine member used to connect or disconnects the driving shaft to a driven shaft. Clutch is located in between flywheel and transmission system. Clutches allow a high inertia load to be stated with a small power. A clutch thus provides an interruptible connection between two rotating shafts. A popularly known application of clutch is in automotive vehicles. Clutch works on the principles of friction. When properly operated it prevents jerks during power flow. 4

CONSIDERATIONS IN DESIGNING A FRICTION CLUTCH : 

CONSIDERATIONS IN DESIGNING A FRICTION CLUTCH The suitable material for the friction surface should be selected. The moving parts of the clutch should have low weight in order to minimize the inertia The clutch should have provision for facilitating repairs. It is usually designed to transmit 125 to150% of the maximum engine torque. Size of clutch should be small. Proper ventilation should be provided for dissipation of heat. Clutch should be positively take the drive with occurrence of sudden jerks. 5

MATERIALS USED FOR FRICTION LINING : 

MATERIALS USED FOR FRICTION LINING The two materials in contact must have a high coefficient of friction. The materials in contact must resist wear effects, such as scoring, galling, and ablation. The friction value should be constant over a range of temperatures and pressures. The materials should be resistant to the environment (moisture, dust, pressure) The materials should possess good thermal properties, high heat capacity, good thermal conductivity, withstand high temperatures Able to withstand high contact pressures Good shear strength to transferred friction forces to structure Should be safe to use and acceptable for the environment 6

TYPES OF CLUTCHES : 

TYPES OF CLUTCHES Positive clutches Friction clutches 7

FRICTION CLUTCHES : 

FRICTION CLUTCHES Cone Clutch Expanding Clutch Single Plate Clutch Multi Disc Clutch Centrifugal Clutch Semi centrifugal Clutch 8

FRICTION CLUTCHES : 

FRICTION CLUTCHES 9 Cones: female= green, male= blue Shaft: male cone is sliding on splines Friction material: usually on female cone, here on male cone Spring: brings the male cone back after using the clutch control Clutch control: separating both cones by pressing Rotating direction: both direction of the axis are possible cone clutch

FRICTION CLUTCHES : 

FRICTION CLUTCHES 10 Single plate clutch Friction plate is held between the flywheel and the pressure plate Springs are arranged circumferentially Friction plate is mounted on a hub A pedal is provided to pull the pressure plate against the spring force when it is required to be disengaged

FRICTION CLUTCHES : 

FRICTION CLUTCHES Multi plate clutch

FRICTION CLUTCHES : 

FRICTION CLUTCHES Centrifugal clutch

FRICTION CLUTCHES : 

FRICTION CLUTCHES SEMI CENTRIFUGAL CLUTCH

DESIGN CALCULATIONS : 

DESIGN CALCULATIONS CLUTCH IS DESIGNED BASED ON TWO THEORYS UNIFORM PRESSURE THEORY UNIFORM WEAR THEORY

Slide 15: 

UNIFORM PRESSURE THEORY   T = μ *W *R. T= Torque transmitted by engine. μ =Co-efficient of friction of material. W =Axial force =2* π*pr*(ro-ri). R=Effective mean radius= 2/3 * (ro3- ri3 / ro2 – ri2 ) Pr = intensity of pressure = p*ri= p* ro (p wil be maximum where r is minimum= ri)

DESIGN CALCULATIONS : 

DESIGN CALCULATIONS UNIFORM WEAR THEORY  T = 2*μ *W*R T= Torque transmitted by engine μ =Co-efficient of friction of material W =Axial force = 2.π. (p*ri) (ro- ri) R=Effective mean radius = (ri + ro )/2 .

Dimentiontions : 

Dimentiontions By using designe parameters we get the dimentions of single plate clutch The outer diameter of the clutch plate do=310 mm The inner diameter of the clutch plate is di=186 mm. Intensity of pressure =190 kpa Co-efficient of friction Asbestos material=0.37 Cotton fabric material=0.45 17

MODELING OF SINGLE PLATE CLUTCH : 

MODELING OF SINGLE PLATE CLUTCH THE MODELING OF SINGLE CLUTCH IS DONE BY USING CATIA V-5 Catia is an 3d mechanical suite It is much faster and more accurate. It provides a greater flexibility for change. It is user friendly both solid and surface modeling can be done.

MODELING OF SINGLE PLATE CLUTCH : 

MODELING OF SINGLE PLATE CLUTCH FRICTION PLATE

MODELING OF SINGLE PLATE CLUTCH : 

MODELING OF SINGLE PLATE CLUTCH PRESSURE PLATE

ANSYS : 

ANSYS ANSYS is general-purpose finite element analysis (FEA) software package. It is a numerical method of deconstructing a complex system into very small pieces  Build Geometry Generate Mesh Apply Loads Obtain Solution Present the Results 21

Analysis of single plate clutch : 

Analysis of single plate clutch 22 Imported model from catia Meshed model of single plate clutch

Analysis of single plate clutch : 

Analysis of single plate clutch 23 Applying loads on single plate clutch Applied pressures on single plate clutch

Analysis of single plate clutch : 

Analysis of single plate clutch ASBESTOS MATERIAL Input parameters Young’s modulus-164.8*10-3 N/mm2 Possion’s ratio-0.2 Density-470Kg/mm3 Thermal conductivity-0.74 w/mk Sp heat-0.84 Kj/kg k 24

Analysis of single plate clutch : 

Analysis of single plate clutch 25 shear stress distribution on single plate clutch Ultimate stress distribution on single plate clutch

Analysis of single plate clutch : 

Analysis of single plate clutch 26 Temperature distribution on single plate clutch Thermal gradient vector on single plate clutch

Analysis of single plate clutch : 

Analysis of single plate clutch 27 Thermal gradient vector on single plate clutch

Analysis of single plate clutch : 

Analysis of single plate clutch ASBESTOS MATERIAL Input parameters Young’s modulus-150*10 N/mm2 Possion’s ratio-0.15 Density-100 Kg/mm3 Thermal conductivity-0.03 w/mk Sp heat-0.31Kj/kg k 28

Analysis of single plate clutch : 

Analysis of single plate clutch 29 Applying loads on single plate clutch Applied pressures on single plate clutch

Analysis of single plate clutch : 

Analysis of single plate clutch 30 shear stress distribution on single plate clutch Ultimate stress distribution on single plate clutch

Analysis of single plate clutch : 

Analysis of single plate clutch 31 Temperature distribution on single plate clutch Thermal gradient vector on single plate clutch

RESULTS : 

RESULTS Asbestos Shear stress developed 0.756N\mm^2 Ultimate Stress 5.34N/Mm^2 THERMAL ANALYSIS Temperature developed 350 k 32 Cotton fabric Shear stress developed 0.7621N\mm^2 Ultimate Stress 3.767N/Mm^2 THERMAL ANALYSIS Temperature developed 361 k

conclusions : 

conclusions In our project we have designed and modeled a single plate clutch using asbestos and cotton fabric as a friction material Modeling is done by using catia We have performed structural and thermal analysis by using both the materials on single plate clutch. Stress values or with in the range of permissible stress