Find each of the components Illustrated in the figure is a s

Find each of the components.

Illustrated in the figure is a shaft having two pulleys and with bearings (not shown) at A and B. The belt pulls and their directions are shown for each pulley. The coordinate system may be identified by the superscripts on the bearing reaction vectors. The partially concealed 375-lb force vector is the belt pull on the 6-in pulley.

Solution

The section being considered is well removed from the loaded ends. Figure4.1

e

shows “lines of force flow”to illustrate the general nature of the stress distrib-ution in cross sections at various distances from the ends. A substantially uni-form distribution is reached at points about three diameters from the end fittingsin most cases.

2.

The load is applied

exactly

along the centroidal axis of the bar. If,for example,theloads are applied a little closer to the top,the stresses will be highest at the top of the bar and lowest at the bottom. (Looking at it another way,if the load is eccentricby amount

e

,a bending moment of intensity

Pe

is superimposed on the axial load.)

3.

The bar is a perfect straight cylinder,with no holes,notches,threads,internalimperfections,or even surface scratches. Any of these give rise to

,which will be dealt with in Section

may be used for other purposes and under vThis invention-relates to a combined stuffing box and shaft bearing adapted especially for use with propeller shafts of motor boats, the object being to provide a device of the character stated which is extremely eflicient and not only prevents the leakage of water about the shaft, where leakage is very undesirable, but serves as an effective universal bearing, allowing freedom of movement to the shaft, even in the absence of true shaft alinement,

A furtherobject is to provide a stuffing box and bearing which is compact, inexpensive and consists of few arts which are exceptionally simple in their construction and easy to assemble, or adjust to obtain the desired results.

The above and other objects are accomplished by my invention which may be briefly summarized as consisting in certain novel details of construction and combinations and arrangements of parts which will be described in the specification and set forth in the appended claims.