Hamrock, Jacobson and Schmid1998 McGraw-Hill Selection of V-Belts Belt Cross Sections: A B.
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Hamrock, Jacobson and Schmid ©1998 McGraw-Hill Selection of V-Belts Belt Cross Sections: A B D esignation A B 3L 3/8in 7/32 in 4L A AX 1/2in 5/16 in 5L B BX 21/32 in 3/8 in C CX 7/8in 17/32 in D 1 1/4 in 3/4 in 3VX 3/8in 5/16 in 5VX 5/8in 17/32 in 8V 1in 7/8 in
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Hamrock, Jacobson and Schmid©1998 McGraw-Hill Belt Length Formula + + L Approx. Belt Length = 1.57(D1+D2) + 2L D1D1 D2D2
Transcript of Hamrock, Jacobson and Schmid1998 McGraw-Hill Selection of V-Belts Belt Cross Sections: A B.
Hamrock, Jacobson and Schmid©1998 McGraw-Hill
Selection of V-Belts
Belt Cross Sections: A
B
Designation A B3L 3/8 in 7/32 in4LAAX
1/2 in 5/16 in
5LBBX
21/32 in 3/8 in
CCX
7/8 in 17/32 in
D 1 1/4 in 3/4 in3VX 3/8 in 5/16 in5VX 5/8 in 17/32 in8V 1 in 7/8 in
Hamrock, Jacobson and Schmid©1998 McGraw-Hill
Selection Guide
Types 3L, 4L, 5L:
Ideal for low horsepower (<3 hp) applications. Excellent for fans.
Types A, B, C, D:
Transmits more horsepower at a longer life than3L, 4L, and 5L belts. Suitable for clutching applications.
Types AX, BX, CX:
Notches provide for more aggressive gripping. For industrial applications of high horsepower.
Types 3VX, 5VX, and 8V:
Smaller wedge angle allows for larger horsepower transfer than with other belts; intended for high horsepower applications.
Hamrock, Jacobson and Schmid©1998 McGraw-Hill
Belt Length Formula
+ +
L
Approx. Belt Length = 1.57(D1+D2) + 2L
D1D2
Hamrock, Jacobson and Schmid©1998 McGraw-Hill
Sample Ratings : FHP (Fractional Horsepower) V-belts
Note: Horsepower ratings are not corrected for arc of contact, ratio, belt length or service factor.
3L 4L 5LPitch
Diameter ofsmaller
sheave at1750 rpm
HorsepowerRating
PitchDiameter of
smallersheave at1750 rpm
HorsepowerRating
PitchDiameter of
smallersheave at1750 rpm
HorsepowerRating
1.251.5
1.752.02.53.03.54.04.55.0
0.090.150.230.290.430.550.610.670.730.78
1.251.52.02.53.03.54.04.55.05.56.0
0.090.140.290.600.881.171.371.491.611.701.78
2.22.53.03.43.94.44.95.45.96.46.97.4
0.360.450.711.071.521.952.262.392.502.592.682.71
Hamrock, Jacobson and Schmid©1998 McGraw-Hill
Sample Ratings: Medium Duty Belts
A B C DPitch
Diameterof smallersheave at1750 rpm
HorsepowerRating
PitchDiameterof smallersheave at1750 rpm
HorsepowerRating
PitchDiameterof smallersheave at1750 rpm
HorsepowerRating
PitchDiameterof smallersheave at1750 rpm
HorsepowerRating
2.002.202.603.003.403.704.004.404.705.005.405.706.006.407.008.00
0.901.171.692.232.953.404.004.695.205.966.356.837.307.918.8110.22
3.003.403.804.204.605.005.405.806.206.607.007.408.008.609.009.40
1.582.473.344.195.106.167.218.229.2210.1911.1312.0613.3914.6615.4816.27
5.607.007.407.808.208.609.009.409.8010.2011.0012.0014.00
6.9412.0913.6215.1116.5617.9619.3220.6221.8823.0923.5327.8631.76
12.013.414.215.016.017.018.019.020.021.0
25.131.434.838.041.745.248.551.454.056.3
Note: Horsepower ratings are not corrected for arc of contact, ratio, belt length or service factor.
Hamrock, Jacobson and Schmid©1998 McGraw-Hill
AX BX CXPitch
Diameter ofsmaller
sheave at1750 rpm
HorsepowerRating
PitchDiameter of
smallersheave at1750 rpm
HorsepowerRating
PitchDiameter of
smallersheave at1750 rpm
HorsepowerRating
2.002.202.603.003.403.704.004.404.705.005.405.706.006.407.008.00
1.241.582.252.903.533.994.465.155.676.186.847.347.828.469.39
10.88
3.003.403.804.204.605.005.405.806.206.607.007.408.008.609.009.40
3.724.625.506.367.198.089.19
10.2711.3412.3913.4114.4215.8917.3218.2319.13
5.607.007.407.808.208.609.009.409.80
10.2011.0012.0014.00
14.1018.3519.4920.6021.6623.1424.6126.0527.4428.7931.3734.3239.31
Sample Ratings: Medium Duty Notched Belts
Note: Horsepower ratings are not corrected for arc of contact, ratio, belt length or service factor.
Hamrock, Jacobson and Schmid©1998 McGraw-Hill
Sample Ratings: Heavy Duty Belts
Note: Horsepower ratings are not corrected for arc of contact, ratio, belt length or service factor.
3VX 5VX 8VPitch
Diameter ofsmaller
sheave at1750 rpm
HorsepowerRating
PitchDiameter of
smallersheave at1750 rpm
HorsepowerRating
PitchDiameter of
smallersheave at1750 rpm
HorsepowerRating
2.152.302.452.602.953.103.303.604.454.704.955.255.956.857.95
10.55
1.371.631.892.152.753.013.343.855.255.656.056.537.639.01
10.6414.22
4.304.554.805.105.405.705.906.206.506.707.007.407.908.409.109.50
8.239.40
10.5511.9313.3014.6615.5616.8918.2219.1020.4122.1324.2626.3529.2330.84
12.3013.0013.8014.8015.8016.8017.8018.8019.8021.00
42.5847.2652.4858.7864.8170.5876.0681.2586.1291.55
