Cam and follower problems pdf

Download chapter PDF. A planar cam mechanism considered is shown in Fig. 8.1 a. The driver link is the cam 1. The disk (or plate) cam 1 has a contour to make a specific motion to the follower 2. The follower moves in a plane perpendicular to the axis of rotation of the camshaft. The contact end of the follower 2 has a semicircular area with the Cam and Follower Prof. H.D.Desai Prof. V.K.Patel Abstract: Cam and follower are widely used in regulating, opening and closing of valves (inlet and exhaust) in the internal combustion engines. Proper design of cam and follower is required for perfect tuning between opening and closing of valves with cam shaft speed. In this paper, the complete A cam‐driven linkage is one way of generating a variable output motion from a constant input shaft velocity. Figure 1 shows an example of a cam‐driven crank‐slider linkage. Cam‐ follower systems are widely used in modern machinery especially in automotive applications; (2) Draw the cam profile for the same operating conditions of problem (1), with the follower off set by 10 mm to the left of cam center. Displacement diagram: Same as previous case. Cam profile: Construction is same as previous case, except that the lines drawn from 1,2,3…. are tangential to the offset circle of 10mm dia. as shown in the fig. characteristics of Cam-follower system. Berzak (1982) developed . a general method for obtaining the optimum design of a Cam-follower system using polynomial output motions which satisfy both the kinematic and dynamic properties of the system. Phan et . al. (1989) investigated an indirect repetitive control theory for linear discrete 4. Displacement diagram Step 1: Construct displacement diagram taking lift (S) = 35 mm on vertical axis and angular displacement of cam on horizontal axis with suitable scale (in this case, scale 15 = 1 cm) as shown in fig. Step 2: Outstroke is SHM for 72 . Divide the outstroke into equal no. of parts (say 6 parts). 5. ANALYSIS OF CAM AND FOLLOWER BASED ON ELASTICITY APPROACH: 1 Where, p )]In operating condition the cam and follower surface exerts the heavy load. Due to heavy load the surface of cam and follower deformed elastically. From fig (2), Elastic deformation at a point at distance x from origin on the surface subjected to non linear pressure p(s) Cam and Follower EES 4 Base circle: The smallest circle from the cam center through the cam profile curve. Stroke or throw: The greatest distance or angle through which the follower moves or rotates. Follower displacement: The position of the follower from a specific zero or rest position (usually it's the position when the follower contacts with the base circle of the cam) in relation to Construction of Cam Profile for a Radial Cam Problem 2: A cam, with a minimum radius of 25 mm, rotating at a uniform speed is to be designed to give a roller follower, at the end of a valve rod, motion described below: • To raise the valve through 50 mm during 120 ° rotation of the cam; • To keep the valve fully raised through next 30 °; • To lower the valve during next 60 °; and 2.22 Picture of the wear on the cam surfaces (Ipek R. and 39 Selcuk B, 2003) 3.1 Tangent cam design (Zahree M. A., Neff G. P., 1996) 41 3.2 Solidworks design of cam and followers 42 3.3 Constraint, load and moment on the system for 44 analysis at 30 degree of cam 3.4 Constraint, load and moment on the system for 45 In cam-roller follower units two lubricated contacts may be di