Microsoft PowerPoint Chapter 6 CHAIN DRIVE 20/3/2023 1 20 Mar 23 1 CHATER 5 CHAIN DRIVES THEORY OF MACHINE AND MACHINE DESIGN DEPARTMENT OF EDUCATION AND TRAINNING HOCHIMINH CITY UNIVERSITY OF TECHNOL[.]
20/3/2023 DEPARTMENT OF EDUCATION AND TRAINNING HOCHIMINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION THEORY OF MACHINE AND MACHINE DESIGN CHATER 5: CHAIN DRIVES 20-Mar-23 Target Understanding the basic of chain drives Understanding dynamic of the chain drives Design the chain drives TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 Theoretical contents I Overview II Sequence of calculation and design the chain drives III Exercise TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 Overview 20/3/2023 Structure 4 1 Driving sprocket Driven sprocket Chain Chain tensioner TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 Overview Geometrical parameters d1, Z1 pitch diameter and number of teeth on the sprocket d2, Z2 pitch diameter and number of teeth on the driven sprocket a: Centre distance TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 Overview Operating principle Movement and load are transmitted from the driving sprocket to the driven sprocket based on the principle of matching in chain drive TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 Overview 20/3/2023 3 Operating principle A chain tensioner is applied to increase the performance of the drive TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 Overview Classification Based on structure : Roller chain Bush chain Inverted tooth chain TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 Overview Classification Based on lines of chain: line chain Multiple lines chain TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 10 Overview 20/3/2023 4 Classification Based on the load mode: Chain drive Conveyor chain Lifting chain TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 11 synchronized chain drive Overview Advantages and disadvantages Advantages: Far center distance transmission ( Roller chain Number of teeth on sprocket: Z1 29 2u Z2 uZ1 (Roller chain11 15 < Z < 100 120) Z should be odd number TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 17 Sequence of calculation and design the chain drives Determine parameters of chain drives Calculation pitch of chain directly by the following equation : pc 2.823 KT1 6003 KP1 Z1p0 K x Z1n1p0 K x Based on satisfied standard abrasion and searched in Table 5.4 ([P] and n01) Pt K Kz Kn P1 P Kx TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 18 Sequence of calculation and design the chain drives Determine parameters of chain drives Based on n1 to determine n01 (the closest given range) Based on n01 and Pt , [P] is selected in Table 5.4 pc [P] n01 n01=50 n01=200 n01=400 … pc [P] pc Pt Kx=1,7 + n1=380rpm => n01=400rpm Kz Z01 25 1, 09 KKK Z1 23 Pt P1 z n 6,7 kW n01 400 Kx select pc=19,05mm Kn 1,05 n1 380 n01=400rpm Pt [P] 8,38 kW b Determine the pitch circle diameters : 𝑝 𝑑 = 𝜋 = 𝟏𝟑𝟗, 𝟗𝑚𝑚 sin(𝑍 ) 𝑝 𝑑 = 𝜋 = 𝟑𝟖𝟐, 𝟐𝑚𝑚 sin(𝑍 ) TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 32 Bài tập ứng dụng Q Roller chain drive has lines of chain, pitch of chain pc=25,4; teeth on driving sprocket Z1=23, Z2=63 Rotating speed of driving sprocket n1=380rpm Center distance a=40pc and coefficient K=1,7 Determine: Pitch circle diameters Chain links Maximum power P1 (kW) TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23 33 TS Phan Cơng Bình binhpc@hcmute.edu.vn binhpc.tpm@gmail.com 20-Mar-23