Project 2 Final Submission

8/8/2019 Project 2 Final Submission

1/11

Project II

ME370: Mechanical Design

Spring 2010

Zachary Katz

Greg Ledva

Michael Kniney


2/11

Bearing Reaction Force Calculation

R=Hydrodynamic Rxn ForceR=Angular Contact Rxn FoceFy=0 20+100 = R + R

M=0 20(2.925)+100(8.475)=R(6)

R(y)=151 lbs

R(y)=-31 lbs

Fz=0 10 = R + R

M=0 10(2.925)=R(6)

R(z)=4.9 lbs

R(z)=5.1 lbs

Total Hydrodynamic Reaction Force is 31.4 lbs in the radial direction

Total Angular Contact Reaction Force is 151.1 lbs in the radial direction (split between 2 bearings)

Additional 5 lbs load in the axial direction on angular contact

Hydrodynamic Bearing Calculations

X value can be found using the given stiffness of 100,000 psi and the force in that direction, 20 lbs.

100lbs

20lb

s

5lbs10lbs

R

2R1

2.925" 6" 2.475"y

xz


3/11

U= Dn= (1.8)(2500rpm)160 =235.6 in/sec

Note: we set D=1.8 from inner diameter of pump sleeve

= 7.2reyns for VG32 @ 80F

Note: 1 reyns = 1x10 (lb in/sec)

P=31.4 lbs (found previously)

Now, use eq(1) to find L= ( 34 2 )L=1.678 in

Hydrodynamic Power Loss Calculation:Ts=

2(21)

12.5 = 4.83 in lb

Note: because our journal sleeve is stationary, U1=0, and U2=U (from previous)

Tr=Ts+Pe(sin ), where P=31.4 lbs, e=.0001345, and = arcsin12)

4

Tr=4.82+(31.4)(.0001345)sin(1.51) = 4.824 in lb

Power loss = = Tr* = (4.825)(261.8 )=1263 in lb/sec = 0.19 hp


4/11

P=81 lbs

L= 3

3

C=(13140)(81) = 1911 lbs = 8500 N

As a result, every bearing in the BNRS19 series satisfies our loading conditions.

So, we chose a bearing that fits well with our shaft and sleeve of a 45mm ID:

45BNRS19

From the Catalogue, the dimensions of the bearing are:

ID=45mm

OD=68mm

B=12mm

Rmin(fillet)=0.6mm

R1min(fillet)=0.3mm


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Project 2 Final Submission

Documents

Transcript of Project 2 Final Submission