1942 - 1947 CHEVROLET SHOP MANUAL
Section 2 - Frame
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ANTI-ROTATION SPRING |
CAM
BUTTONS |
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PISTON SCREW AND SPRING |
INSIDE END VIEW OF
PISTON |
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REBOUND
END
PISTON FILLER
PLUG |
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COMPRESSION RELIEF VALVE |
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Fig. 13—Opposed Cylinder Double-Acting Shock Absorber with
External Relief Valves |
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and the compression piston with
the spring-loaded compression valve. Each valve has a bleeder hole in the
valve stem. Under normal car operation, when the fluid pressure is applied
by the piston, transfer of fluid takes place through the bleeder hole, but
for violent road shocks the valve opens, allowing a more rapid transfer of
fluid past the valve seat as well as though the bleeder hole.
As the shock absorber arm moves
downward, due to car spring rebound movement, pressure set up in the
rebound cylinder forces fluid through the bleeder hole or opens the
rebound valve, according to severity of rebound. At the same time the
compression intake valve opens, due to the partial vacuum created in
the compression cylinder, filling the compression cylinder with
fluid.
As the shock absorber arm moves
up, pressure set up in the compression cylinder forces fluid through the
bleeder hole or opens the compression valve, according to severity of
compression. At the same time the rebound intake valve opens, due
to |
the partial vacuum created in the
rebound cylinder, filling the rebound cylinder with fluid.
In the above manner, the action of
the fluid is the same in both the rebound and compression cylinders, but
the rate of up and down movement of the arm is controlled by the size of
the bleeder holes and tension of the valve springs. Identification of
the valve assemblies is possible by the number stamped on the valve. The
compression end of the front shock absorber is under the shock absorber
arm.
EXTERNAL VALVE TYPE
A type of double-acting shock
absorber available as special equipment on either 1-1/2-ton
conventional or C.O.E. models is shown in Fig. 13. This is an opposed
cylinder design with external relief valves.
The two pistons of the shock
absorber are held together by two screws in the same manner as the design
previously described. The end caps must |
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