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Патент USA US2092639

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Sept. 7,‘ 1937. '
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2,092,639 I
GEAR MEANS FOR ELIMINATING A MASTER CONNECTING ROD
‘ Filed April 2a, 1936
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Sept.' 7, 1937.
R..CHILTON
2,092,639
GEARYMEANS FOR ELIMINATING A MASTER CONNECTING ROD
Filed April 28, 1956
BY
3 Sheets-Sheet 2
Sept. 7, 1937.
'
‘R. CHILTON
2,092,639
‘GEAR MEANS FOR ELIMINATING A MASTER CONNECTING ROD
Filed April 28. 1956
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Patented Sept. 7,‘ 1937
, 2,092,639
UNITED STATES PATENT OFFICE
2,092,639
GEAR MEANS FOR EIJMINATIN'G A MASTER -
CONNECTING ROD
Roland Chilton, Ridgewood, N. J., assignor to
The Reed Propeller Co., Inc., a. corporation of
New York
Application-April as, ‘1936, Serial No. ‘16,766,
5 Claims.
(01. 121-120) '
This invention relates to connecting rods for en
gines wherein a plurality of rods cooperate with a
bevel pinions 48, 42 splined on projecting ends of
common'crankpin.
bore formed in the rear vcrank member 22, the
'
a cross shaft 44 carried in bushings 46 in a cross
'
pinions being secured axiallyby suitable nuts 48
as shown. ,It will be noticed, in the plan section
ments as follows: The well-known master-and- ' view of Fig. 3, that the cross shaft is slightly an
A prime object of the invention is to overcome
5 disadvantages found in the conventional arrange
gulated from a normal axial relation with the
link rod construction for radial engines sets up
unsymmetrical piston movements and accelera
tions due to the angularity of the master rod.
10 This angularity gives an elliptical'path to the
various knuckle pins, the degree of ellipticity be
ing greatest on the knuckle pins on the side re
mote of the master rod shank. These variations
from symmetrical piston motion give rise to un
crankshaft so that the pinion 40 meshes with the
connecting rod spool gear 38 but clears the ?xed
gear l4, while the companion pinion 42 meshes
with the ?xed gear l4 but clears the connecting
rod gear 38.
.
i
'
to the ?xed gear M by the ball bearing I8, while
the crankpin spool 28 is located axially by a
15 desirable unbalanced forces; set up errors in the
thrust plate 50' cooperating with a companion
piston stroke relationship and greatly increases
the maximum angularity of the link rods, thereby
increasing the piston side pressures.
3
p The crankshaft is located axially with respect
thrust plate 52 carried by the spool 28-, a suit
able thrust bearing disc 54 being interposed.
Thus, the axial thrust reactions of the bevel gears
'
Accordingly, the present invention aims in over
20 coming all these effects and in providing a new
and improved structure wherein all of the knuckle
pins have a true circular motion.
and pinions are resisted by equal and opposite
thrust‘ forces at the ball bearing l8 and the thrust
bearing comprising the elements 50, 52, 54.
These pinions comprise a 1:1 planetary driv
Other objects will be obvious from, or will be
pointed out in the following description with ref
ing connection between the ?xed gear l4 and the
connecting rod gear 38. The action may be 25
25 erence to the drawings, in which:
Fig. 1 is a section through the crankshaft axis _ visualized by imagining the crankshaft held from
rotation and the gear l4 freed from its ?xed
of a radial engine incorporating the invention; anchorage and rotated, whereupon it will be seen
Fig. 2 is a fragmentary end view; and ‘
Fig. 3 is a fragmentary plan view in section on that the same direction and amount of rotation
of the gear M will be communicated to the gear
the line 3 of Fig. 1.
38. Thus, since the gear I4 is in fact locked from
v Referring ?rst to Fig. 1, l0 designates a crank
case which is conventional except that it is rotation, the connecting rod gear 38 is-likewise
equipped with internal splines or teeth l2 engaged held from rotation upon the crankpin axis in
by corresponding teeth on a ?xed hypoid bevel spite of the fact that it has a circular orbital
35 gear I4 additionally secured by screws l6 which motion on that axis. In other words, if the de
vice be assembled with the upper knuckle pin 34
also serve to secure a crankshaft rear ball hear
ing 18 by means of an extension ?ange 20 of the vertically above the crankpin center, this knuckle
gear M, the latter being concentric with the
crankshaft journals.
-
Supported in the bearing i8 is a crankshaft
rear member 22 having a usual clamp joint in
cluding a clamp bolt 24 with a crankpin 26 in
tegral with a front crankshaft section 28 support
4a
ed in a front bearing 30 as usual.
In place of the conventional master rod, there
is rotatably mounted on the crankpin 26 a crank
pin member 28 comprising a spool having ?anges
3-0, 32 provided with suitable holes for equally
spaced knuckle pins 34 on which articulate con
O ventional link rods 36. Formed integral with the
right-hand flange 32 of the spool 28 is a bevel
. gear 38 which is a companion to the ?xed bevel
gear I4 but which is concentric with the crank
pin. These gears are of hypoid tooth form as
55 shown in Fig. 2 and are respectively engaged by
pin remains vertically above the crankpin cen
ter throughout its orbital motion. Thus, any
vertical line on the crankpin member 28 remains 40
vertical in all positions of the crankshaft; all the
knuckle pins have-a purely circular path and
each of the link rods have a symmetrical motion
with respect to their individual cylinder axes,
whence the maximum angularities of the link 45
rods are identical and are substantially smaller
than with a conventional master rod.
Due to manufacturing tolerances, de?ection of
the parts, and bearing wear, the orbital radius of.
the connecting rod spool is not an exactly de
terminable quantity. In general, as the con
necting rod bearing wears, and as increase in
speed increases the centrifugal load, there is a _
tendency for this orbital radius to increase and
it is an important feature of the gear organiza- l6
2
2,092,689
tion of this invention that such increase is per
mitted without imposing additional loads on the
gears. This self-adjusting characteristic is not
inherent in certain rotating link schemes of the
prior art where it has been found necessary ac
cordingly to give the links freedom to extend,
which somewhat complicates the structure and
results in the entire turning moment of the spool
being resisted by one link at a time, although a
10 relatively large multiplicity of links must be used
crankshaft axis, a shaft and hypoid pinions driv
ably connecting said gears and organized for
bodily rotation with said crankshaft.
While I have described my invention in detail
in its present preferred embodiment, it will be
3. The combination with a shaft having a
crankpin. a cross shaft carried by said shaft, a
bevel pinion on each end of said cross shaft,
bevel gears concentric respectively with said 10
crankshaft and crankpin, and a connecting. rod
member rigid with the crankpin gear the latter
being meshed with one of said pinions, said non
obvious to those skilled in the art, after under
rotating gear concentric with said crankshaft be
standing my invention, that various changes and
modi?cations may be made therein without de
parting from the spirit or scope thereof. I aim
ing meshed with the other of said pinions.
in the appended claims to cover all such modi?
ported in said bearing and having a crankpin,
to ensure smooth action.
20
connecting rods articulated to said member, a.v
bevel gear organized for rotation with said mem
ber, a companion gear held from rotation on the
15
4. In an engine, in combination, a crankcase in
cluding a crank shaft bearing, a crankshaft sup
cations and changes.
a connecting rod member rotatable on said
What is claimed is:
1. The combination with a crankpin, of a spool
member rotatable thereon, a plurality of knuckle
crankpin, a bevel gear secured to said member, 20
a bevel gear secured to said crankcase, pinions
meshed with respective gears and a cross shaft
pins carried by said member, a connecting rod
engaging each knuckle pin, a hypoid bevel gear
25 secured to said spool, a companion gear held from
connecting said pinions and carried by said
rotation concentric with the center of- rotation
of said crankpin, a cross shaft supported for ro
tation with the crankpin, and bevel pinions ro
member and a crankcase member, of bevel gears
secured to respective members, a crankshaft, a
cross shaft carried by the crankshaft, and bevel
pinions on the cross shaft engaging the respec
tatable with said cross shaft and engaging re
spective hypoid gears.
2. The combination with‘ a crankshaft having
a crankpin, of a crankpin member, a plurality of
crankshaft.
v
5. The combination with a crankpin bearing 25
tive gears.
'
.
ROLAND CHILTON.
30
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