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1935 Chevy CLUTCH ASSEMBLY
Construction
The clutch used in Chevrolet passenger cars and trucks is of the
single plate dry disc type of simple construction and of rugged,
sturdy design.
The pressure plate is a heavy cast iron casting with rib-like depressions
in its rear surface which dissipates the heat caused by clutch
engagement, without warping the pressure plate. It is actuated
by means of nine springs and three levers. The springs are spaced
in three groups of three between the levers. The levers are spaced
120 degrees apart forming a three-point contact. The final result
of this design is a pressure plate that always engages the facing
squarely, assuring smooth, positive clutch action.
The cover is a steel stamping. At the three points where the levers
are mounted, heavy malleable iron castings are riveted to the cover
to rein-force it and form a support for the levers.
The pressure levers are carefully designed and manufactured to
provide for strength and weight distribution. The levers are pivoted
on pins which bear in the brackets on the outside of the cover.
Springs are provided to maintain contact of the levers with the
release bearing plate and the bearing plates between the posts
of the pressure plate to prevent rattles.
The clutch disc is cushion mounted at the hub. Eight springs form
the only means of contact between the hub and the disc carrying
the friction facings. By this method, torque impulses of the engine
are cushioned out before being transmitted to the spline shaft
of the transmission.
The throwout fork and bearing is mounted on a ball swivel, assuring
perfect alignment of the release bearing.
The clutch throwout bearing is made of carbon graphite composition
and is mounted in a cast iron collar which is attached to the clutch
throwout fork by means of two springs. The face of the bearing
has two grooves or slots to permit liberation of foreign matter
and particles of carbon which may wear off of the bearing.
The collar, into which the bearing is shrunk, has an oil reservoir
with an oiler at the top. This allows this reservoir to be filled
with oil when the bearing begins to "squeak" and the
oil in turn will seep into the bearing, preventing squeaking.
All parts of the clutch are balanced within very close limits before
they are passed for use in production or service.
On the passenger car models the clutch pedal is mounted on the
frame and connected to the throwout fork through a linkage control
which pre-vents engine movement from being transmitted to the pedal
and also provides for smooth clutch engagement.
Operation
The clutch is very simple in operation. Pressure applied to the
clutch pedal is transmitted to the clutch fork and bearing through
a series of link-age. The bearing engages the clutch sleeve and
this in turn forces the clutch sleeve and fingers for-ward, drawing
the pressure plate backward, compressing the springs and relieving
the pressure from the clutch disc and disconnecting the engine
from the transmission.
Clutch Specifications See
page image below to read these values.
1931 1932 1933 1934 1935
Type Single Plate Single Plate Single Plate Single Plate Single Plate
Dry Dry Dry Dry Dry
Facing Material Moulded Moulded Moulded Moulded Moulded
Braided Braided Braided
114 Ton Trucks Moulded Moulded Moulded Moulded Moulded
Standard Moulded Braided Braided
Moulded Moulded
Outside Diameter 9" 9" 9" 9" 9"
114 Ton Trucks 10" 10" 10" 10" 10"
Clutch Pilot Bearing ND ND ND ND ND
Standard Hyatt Hyatt ND
Floor Board Clearance.. . 12" %,, Iz" 19" 12"
Free Travel before Clutch Begins to
Disengage
Clutch Throwout Plate Run-out .020" .020" .020" .020" .020"
Flywheel Diameter 12N" 12N" 12" 123 " 12N"
Standard 12N" 12 /" 12/
