A journal and bearing are to be designed for a shaft that turns at 250 rpm....

A journal and bearing are to be designed for a shaft that turns at 250 rpm. Suppose
ISO VG100 (SAE Engine 30) is to be used as lubricant and the bearing length is to be equal to
1.2 times the diameter. If the no-load power loss is not to exceed 2.5 x 10-4 horsepower and the
diametral clearance is 0.0045 times the diameter, estimate the maximum diameter that can be
used for the journal, and the allowable temperature limit.

Solutions

Expert Solution

samet mamat answered 1 year ago

Next > < Previous

Related Solutions

A shaft inside the sleeve of a journal bearing is being rotated at 1500 rpm. The...

A shaft inside the sleeve of a journal bearing is being rotated at 1500 rpm. The shaft is 6.00 cm in diameter and is rotating in a bearing sleeve that is 6.02 cm in diameter and 40 cm long. The clearance is filled with oil having properties of ?=0.003 m2 /s and SG=0.88. a. Find the torque required to rotate the shaft. b. Find the power required to rotate the shaft. (Answer: 44.1 kW) c. Discussion: How do the torque...

all journal bearing has a shaft diameter=1.25in and suppports a load of 1200lbf. the bushing is...

all journal bearing has a shaft diameter=1.25in and suppports a load of 1200lbf. the bushing is 1.25-in long and has a bore diameter=1.25in. shfat speed=1500 rev/min. average film temperature=115.4oF and SAE grade 30 lubricant is used. average clearance =0.001125 in. Find a) magnitud and location of min oil-film thickness b) total lubricant volumetric flow rate c) max oil-folm pressure and its angular location d) power loss

A .05 wide journal bearing supporting the loads on a 1 inch shaft just meets the...

A .05 wide journal bearing supporting the loads on a 1 inch shaft just meets the Trumpler’s design criteria for a FACTOR OF SAFTY OF 2.05. The bearing satisfies all the other Trumpler’s design criteria by much larger margin. Your colleague suggests that increasing the bushing width to 0.75 inches would be an adequate design and you would not need to conduct another journal bearing analysis because the greater width would result in a bearing which satisfy all of Trumpler’s...

For a marine diesel engine application, a fluid-film journal bearing has a shaft diameter of 32...

For a marine diesel engine application, a fluid-film journal bearing has a shaft diameter of 32 mm and the length of the bearing is 24 mm. The bearing uses SAE grade 20 oil as lubricant and operates under a radial load. The inlet and outlet temperatures of oil are 50oC and 110oC respectively. It is assumed that because of the shearing action there is a uniformly distributed energy release in the lubricant that heats the lubricant film. During run-in operation,...

The J-shaped member shown in the figure is supported by a cable DE and a single journal bearing with a square shaft at...

The J-shaped member shown in the figure is supported by a cable DE and a single journal bearing with a square shaft at A. Determine the reaction forces A_y and A_z at support A required to keep the system in equilibrium. The cylinder has a weight W_B = 5.30 lb, and F = 1.20 lb is a vertical force applied to the member at C. The dimensions of the member are w = 1.50 ft, l = 6.00 ft, and...

The J-shaped member shown in the figure is supported by a cable DE and a single journal bearing with a square shaft a...

The J-shaped member shown in the figure is supported by a cable DE and a single journal bearing with a square shaft at A. Determine the reaction forces Ay and Az at support A required to keep the system in equilibrium. The cylinder has a weight WB = 5.80 lb, and F = 1.30 lb is a vertical force applied to the member at C. The dimensions of the member are w = 1.50 ft, l = 6.00 ft, and...

5. A shaft rotates at a rate of 50 RPM against a constant torque of 2000...

5. A shaft rotates at a rate of 50 RPM against a constant torque of 2000 N.m. Calculate: a. The power required to rotate the shaft. b. The work required to rotate the shaft through 150 revolutions.

A horizontal shaft of 75mm diameter projects from a bearing and, in addition to the torque...

A horizontal shaft of 75mm diameter projects from a bearing and, in addition to the torque transmitted, the shaft carries a vertical load of 8 kN at 300 mm from the bearing. If the safe stress for the material, as determined in a simple tension test, is 135 MN/m2 find the safe torque to which the shaft may be subjected using as a criterion (a) The maximum shearing, stress, (b) The maximum strain energy per unit volume. Poisson’s ratio ?...

A shaft cycles such that each bearing undergoes the radial loads of 30% of the time...

A shaft cycles such that each bearing undergoes the radial loads of 30% of the time at 20kN, 50% of the time at 25kN, and 20% of the time at 30kN. If the design life of a bearing is to be at least 5e6 revolutions, select the smallest 03 series cylindrical roller bearing that will accomplish this.

HW Problem 5: A 150 kW motor drives a hollow round shaft at 1,200 rpm. The...

HW Problem 5: A 150 kW motor drives a hollow round shaft at 1,200 rpm. The outer diameter of the shaft is 100-mm and the inner diameter is 0.95*outer diameter. It is made of AISI 1050 WQ&T at 425- deg C. (a) Look online or the book and explain briefly what “WQ&T” in the material designation stand for, and how it is different than OQ&T. Which is stronger at the specified temperature? (b) Determine the maximum torsional shear stress (Tau...

Subjects