SHIGLEY'S MECHANICAL ENGR DESIGN (LL)
10th Edition
ISBN: 9781308945446
Author: BUDYNAS
Publisher: MCG/CREATE
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 12, Problem 18P
Design a central annular-groove pressure-fed bearing with an l′/d ratio of 0.5, using SAE grade 20 oil, the lubricant supplied at 30 psig. The exterior oil cooler can maintain the sump temperature at 120°F for heat dissipation rates up to 1500 Btu/h. The load to be carried is 900 lbf at 3000 rev/min. The groove width is
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
It has a full-slide type bearing rotating at a speed of 1975 rpm.A load of 5693 N is applied. SAE 40 oil in bearing at 60C inlet temperatureplanned to be used.Shaft and bushing diameters in bearing with tolerance data 41−0.010 respectively+0.000mmand 41.125−0.000+0.100 mm.Average radial clearance mounting for this bearing with bush length 20.50 mmCalculate the following;a) Bearing characteristic number,b) Minimum lubricant film thickness,c) Eccentricity value,d) coefficient of friction,e) Average oil film temperature andf) Find the Tmax temperature value.
Consider the belt drive having a diameter of 150 mm that is mounted on the overhung end of ashaft, 30 mm from the nearest bearing. The stepped shaft is made of steel having Su = 965 MPa(140 ksi). The shaft diameter, d, is 30 mm. The bearing bore, D, is 36 mm. The fillet with amachined surface has a radius, r, of 3 mm. What is the safety factor with respect to eventualfatigue failure of the shaft?
b) Design a single row deep groove ball bearing with basic dynamic load rating of 33 KN to be used in a turbine to carry a radial load of 1584 N. The expected life of the bearing is 5591 hours at 529 rpm. Take k=3 for all types of ball bearings. Take the value of the shock load factor as 1.8. The radial and axial load factors are 1.3 and 1.6 respectively and the rotational factor is 1. Calculate:
i) Expected life of bearings in millions of revolutions
ii) Design equivalent dynamic load in N
iii) Basic equivalent dynamic load in N
iv) Axial load acting on the bearing in N
Chapter 12 Solutions
SHIGLEY'S MECHANICAL ENGR DESIGN (LL)
Ch. 12 - A full journal bearing has a journal diameter of...Ch. 12 - A full journal bearing has a journal diameter of...Ch. 12 - A journal bearing has a journal diameter of 3.000...Ch. 12 - Prob. 4PCh. 12 - Prob. 5PCh. 12 - Prob. 6PCh. 12 - Prob. 7PCh. 12 - Prob. 8PCh. 12 - A full journal bearing is 28 mm long. The shaft...Ch. 12 - A 114114 in sleeve bearing supports a load of 700...
Ch. 12 - A full journal bearing has a shaft diameter of...Ch. 12 - Prob. 12PCh. 12 - Prob. 13PCh. 12 - A natural-circulation pillow-block bearing with...Ch. 12 - An eight-cylinder diesel engine has a front main...Ch. 12 - A pressure-fed bearing has a journal diameter of...Ch. 12 - Design a central annular-groove pressure-fed...Ch. 12 - Repeat design problem Prob. 1218 using the nominal...Ch. 12 - Table 12-1 gives the Seireg and Dandage curve fit...Ch. 12 - For Prob. 1218 a satisfactory design is...Ch. 12 - An Oiles SP 500 alloy brass bushing is 0.75 in...Ch. 12 - Prob. 23P
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A connecting rod for an I.C. engine running at 1800 r.p.m. and developing a maximum pressure of 3.15 MPa. The diameter of the piston is 100 mm; mass of the reciprocating parts per cylinder 2.25 kg; length of connecting rod 380 mm; stroke of piston 190 mm and compression ratio 6:1. Take a factor of safety of 6 for the design. Take length to diameter ratio for big end bearing as 1.3 and small end bearing as 2 and the corresponding bearing pressures as 10 MPa and 15 MPa. The density of material of the rod may be taken as 8000 kg/m³ and the allowable stress in the bolts as 60 MPa and in cap as 80 MPa. The rod is to be of I-section for which you can choose your own proportions. Calculate the dimension of I- section of the connecting rod.arrow_forwardA power screw assembly with single acme threads is to be used to raise a load of 3000 lbf at an axial displacement rate of 2.5 in/s. The steel screw has a nominal diameter of 2 inches and its threads are oil lubricated. The screw is paired with a bronze nut; axial support is provided by a thrust collar with a bronze thrust washer that is secured to the frame. The mean radius of the collar is 1.1 inches. A gear motor is utilized to drive the power screw assembly. a. What is the minimum power requirement for the motor? b. Do you expect the power screw assembly to be self-locking? c. Calculate the efficiency of the screw assembly.arrow_forwardDesign a typical rigid flange coupling for connecting a motor and a centrifugal pump shafts. The coupling needs to transmit 15 KW at 1000 rpm. The allowable shear stresses of the shaft, key and bolt materials are 60 MPa, 50 MPa and 25 MPa respectively. The shear modulus of the shaft material may be taken as 84GPa. The angle of twist of the shaft should be limited to 1 degree in 20 times the shaft diameter. Note: show complete solutionarrow_forward
- A pressure-fed bearing has a journal diameter of 75.00 mm with a unilateral tolerance of -0.05 mm. The bushing bore diameter is 75.084 mm with a unilateral tolerance of 0.010 mm.The length of the bushing is 62.00 mm. Its central annular groove is 12.00 mm wide and is fed by SAE 30 oil is 53 °C at 200 kPa supply gauge pressure. The journal speed is 2880 rev/min carrying a load of 30 kN. The sump can dissipate 300 watts per bearing if necessary. For minimum radial clearances, find: the average temperature. Given the film temperature is 85 o Carrow_forwardA Self-aligning medium series bearing for bores of 85 mm is operating at 300 r.p.m for an average life of 9 years at 10 hours per day, is acted by a 15 kN radial load and 10 kN thrust load. The bearing is subjected to a light shock load and the inner ring is sationary. Determine the suitable self-aligning bearing. Mention the advantage of using self align bearing.arrow_forwardAn industrial fan running at 600 rpm is driven by a 25kW, 960rpm, induction motor using an open belt drive. The pulley is mounted on the motor shaft of 270mm diameter. Center distance between the two shafts is 1.45 meters and coefficient of friction is 0.35. Assume thickness of belt equal to 6.5 mm and an allowable stress of 2.86MPa for belt material. Calculate the following: a) Angle of lap for both pulleys; b) Length of the belt; and c) Width of the belt (disregard standard size).arrow_forward
- Two shafts made of plain carbon steel are connected by a rigid protective type flangecoupling. The shafts are running at 500 rpm. and transmit 25 kW power. Design thecoupling completely for overload capacity 25 per cent in excess of mean transmittedtorque capacity. Assume the following permissible stresses for the couplingcomponents:a. Shaft — Permissible tensile stress = 60 MPa; Permissible shear stress = 35 MPab. Keys — Rectangular formed end sunk key having permissible compressivestrength = 60 MPac. Bolts — Six numbers made of steel having permissible shear stress = 28 MPad. Flanges — Cast iron having permissible shear stress = 12 MPaarrow_forwardcampute the bending stress number for the goer pair described by the given data beLow. KS= 1, Km= 1,21, F= 2.00 in, DP= 3,33 in, NG= 70, Np=20 hp = 1750v. p.m, Av=11, Pd =6, Tp= 900ib V1= 1527 ft/min The matarial used for pinion a gear is cast ironarrow_forwardYou are asked to design a plain surface journal bearing to carry a steady radial load of 5.75 kN while the shaft rotates at 950 rpm. The shaft stress analysis determines that an acceptable nominal diameter of the journal is 62.5-mm and an l/d ratio is 1. The shaft is part of a machine requiring good precision. So a minimum radial clearance cmin= 0.040 mm seems appropriate. We shall use SAE 30 oil as a lubricant, at an inlet temperature of 45 oC. Analyze the hypothetical bearing,a) Determine the operating temperature Tave, and operating viscosity μave. b) Determine the minimum film thickness, ho, temperature rise of the lubricant, ΔTC, the total oil flow, Q, and side flow Qs in [mm3/s], the maximum film pressure Pmaxdeveloped in [MPa]. c) Determine the power loss, Hloss in [W], friction torque, Tf in [N-m] d) For minimum radial clearances, perform a design assessment using Trumpler’s criteria.arrow_forward
- b) Design a self-aligning ball bearing with basic dynamic load rating of 69.5 KN to be used in the automobile industry to carry a thrust load of 1184 N. The expected life of the bearing is 5201 hours at 628 rpm. Take k=3 for all types of ball bearings. Take the value of the shock load factor as 1.7 and radial and axial load factors are 1.4 and 2.2 respectively, the rotational factor is 1. Calculate: i) Expected life of bearings in millions of revolutions ii) Design equivalent dynamic load in N iii) Basic equivalent dynamic load in N iv) Radial load acting on the bearing in Narrow_forwardA single deep grove ball bearing series 3, the outer ring rotates at 1500 rpm with little shock load. Bearing has a bore diameter of 45 mm, working with a load 1890 lb radial and 1250 lb axial load. Determine the rated life and median life of the bearing. Use the design factors according to the attached table.arrow_forwardThe values given for a radial plain bearing are:Shaft diameter = 40 mm, bearing width = 30 mm, Pem = 6 N / mm2, Radial force = 2 KN, Ty = 45 C, oil: ISO VG 15, bearing clearance = 35 µm, dynamic viscosity for given oil and temperature = 12 m Pa. sRequired:a) What is the working cycle of the shaft?b) Find the Sommerfeld number.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
BEARINGS BASICS and Bearing Life for Mechanical Design in 10 Minutes!; Author: Less Boring Lectures;https://www.youtube.com/watch?v=aU4CVZo3wgk;License: Standard Youtube License