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Patented Nov. 12, 1946
2,410,958
UNITED STATES ~ PATENT OFFICE
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2,410,958
‘
ENGINES OPERATING COAXIAL SHAFTS
James B. Brockhurst, RedvBank, N. J. _
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Application August 2, 1943, Serial No. 496,984
10; Claims.
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(01. 123-197) I
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1
2
same direction as the outer shaft, issupplemented
This invention, which comprises a development
of the improvement disclosed in my application
Serial-No. 473,605, ?led January 26, 1943, is di
by the 'rotative speed of said‘outer shaft._
reot'ed to a prime mover having co-axial driven
shafts which derive- motion therefrom and are
will hereinafter appear.
In the drawing: '
Other features and advantages of my inventio
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Figure'l is a front sectional view of a cylinder
capable of rotation at relatively different speeds.
with its piston and connecting rod as part of a
The co-axial shafts, due to their respective
nine cylinder, air cooled engine.
speeds of rotation, may be utilized for a variety
Fig. 2 is a side sectional view of the same, and
of purposes, both mechanical and electrical, and
Fig. 3 is a cross section of the piston showing its
my present development is therefore not limited 10
peripheral ?utes.
to any one particular instance of power applica
Fig. 3A is a cross section of a modified piston
tion, but rather to means whereby a single prime
source of power is enabled to cause the rotation,
having reversed ?utes.
In said ?gures let I indicate a cylinder forming
at'diiferent speeds, of respective co-axial power
shafts.
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15 part of a nine cylinder, air cooled engine,’ only
parts of certain remaining cylinders being illus
I The example of my invention represented in
trated in Fig. 1.
_
v
this application is based upon a compound inter
The piston for said cylinder is indicated at 2,.it
nal combustion engine as developed from the dis
having a lower skirt portion that is provided with
closuregiven ‘in my said application Serial No.
473,695, and it embodies a cylinder having a pis 20 piston rings 3, said skirt portion being continued
ton whose pistonrod in, the reciprocating action
upwardly in rbell-likelformation 4, with an upper
cylindricalportion 5 that carries the piston head
of the pistoniserve‘s to rotate the crank shaft and
hence'to rotate the outer one‘ of. ‘the co-axial
6,,and from/said piston head 6 there depends an
shafts, the said piston also being given .a rotating
outer concentric wall '4. which, is in movable oppo
movement that, through the connecting rod and 25 sition to the inner wall of the cylinder. ‘Said wall
a system of gears, imparts rotation to the inner
one of the co-axial shafts, the R. P., M. of said
inner shaft being supplemented by thev speed of
the outershaft, when the shafts arerotated in
the same direction, but the speed of said inner
shaft being relatively less when said shafts are - '
7 caused to rotate in opposite directions.
‘I is ‘provided inits outer surface with a series of
inclined flutes or vanes 8, for a purpose to be re
ferred to hereinafter. An annular gap 9 sepa
rates the piston skirt. from wall ‘I, said gap so dis
posed as to register with a fuel inlet it formed
through the cylinder wallwhen the piston‘ has
compressed a charge of , air in the cylinder to the
' ‘
Whilst in my said earlier application Serial No. ' ' pointewhere liquid fuel, injected as from a nozzle
H through said inlet, will cause ignition and
rotation of the piston, is intended to supplement 35 power expansion of the charge.
I 473,605 the expansive power, applied through the
the power exerted upon the crank shaft in the re
It will be noted that a chamber [2 is formed be
ciprocating action of the piston, the present im
provement is directed to the utilization of the ex
pansive power developed through the piston rota
tween the piston portions 4, 5, 6 and ‘I, and that
tion for the operation of a shaft that is en
the entry of the air occurs through the single in
take and exhaust valve [3, during the down
40
stroke.
,
The piston cylindrical portion 5 is shown as
threaded interiorly and receives a screw plug I4,
herein as the “inner shaft” in contradistinction
that carries a universal joint l5 from which de-'
pends the connecting rod !6. It should be pre
to the usual crank shaft, which latter may be
styled the “outer shaft.”
45 mised now that the piston is capable of both re
ciprocating ‘and rotary movements, also the piston
Said inner shaft, which may continue into or
rod. The piston rod, at its lower end, is revolubly
comprise a propeller shaft, when the engine is
mountedrin a bearing member I‘! that itself is
employed in the operation of aircraft, is capable
revoluble 0n the crank-pin I8, also the lower end
of rotation either in the same direction as that of
the outer shaft, or in the opposite direction, ac 50 of the piston rod is provided with a bevel gear l9
sheathed by and is co-axial with the usual crank
shaft. Said ensheathed shaft may be designated ‘
cording to the direction of inclination of the pis- .
which is in mesh with a bevel gear 20 carried by ‘
a shaft 21 that is journalled in bearing member
l'l, said shaft 21 carrying a pinion 22 which is
revoluble on crank-pin l8 and is in mesh engage
?utes—_it being notable however that the rate of
speed'of said inner shaft, when driven in the 55 gagement ‘with a gear 23 loosely mounted on
ton ?utes; also, the R. P. M. of said inner shaft
is governed by the degree of angularity of said
2,410,958
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4
3
4. In an engine, the method of transmitting
the power of a prime mover through a plurality
of co-ordinated systems of operation having co
crank-pin I8, and in mesh engagement with a
gear 24 carried by a shaft 25 (the inner shaft)
which is ensheathed by and rotatable within the
crank shaft 26 (the outer shaft).
In the example illustrated the crank shaft is
shown as in splined engagement with the crank
pin, though obviously it may be an integral part
thereof. The two-part arrangement is suggested
for production purposes.
axial, telescoped shafts rotating independently of
each other whereby the R. P. M of an inner shaft
is varied by the R. P. M. of an outer shaft.
5. In an engine, a cylinder, a piston, a crank
shaft and a second shaft revoluble within said
crank shaft, means whereby expansive power
The opposite crank arm 21 carries a crank shaft 10 operates directly to both project and rotate said
piston, means whereby the projecting movement
28, and operable therein is an inner shaft 29,
whose gear 30 is in mesh with a gear 3| that, like
, of said piston serves to operate said crank shaft,
and means whereby the rotating movement of
said piston serves to operate said second shaft.
6. In an engine, the method of transmitting
My improved engine is intended for use in a 15
the power of a single prime mover directly to
variety of automative applications wherein a plu
telescoped shafts, and causing said shafts to ro
rality of shafts, actuated by a single ‘piston, are
tate independently and in concert.
adapted to perform separate and distinct func
23 is similarly operated through the rotation of
piston 2.
7. In an engine, a cylinder, a hollow piston of
tions in the same power plant assemblage. Thus,
in an airplane the inner and outer shafts may 20 ?xed cubical capacity therein, a crank shaft and
operate respective co-axial propellers. Also, one
a second shaft revoluble within said crank shaft,
means whereby expansive power, developed from
of the shafts may operate a supercharger. '
within said piston operates directly to both pro
For automotive road'vehicles respective shafts
ject and rotate said piston, means whereby the
may operate right and left drive wheels and func
tion with the aid of suitable differential gearing. 25 projecting movement of said piston serves to op
As will be apparent, the direction of rotation
erate said crank shaft, and means whereby the
of the piston is governed by the direction of angle
rotating movement of said piston serves to oper
given the ?utes 8 in the piston periphery, so that
ate said second shaft.
.
8. In an engine having an inner and an outer
the inner shaft may be caused to rotate either
positely.
driving shaft rotated independently through in
dependent movements of the engine pistons,
~ Variations within the spirit and scope of my
means for rotating the inner shaft through ro
in the same direction as the outer shaft, or op
30
invention are equally comprehended by the fore
tating movements of the pistons and means for
rotating the outer shaft through reciprocating
going disclosure.
35 movements of said pistons, whereby the said in
I claim:
1. In an engine, the method of transmitting
ner and outer shafts are rotated in concert to
the power of a prime mover to co-axial tele
affect the R. P. M. of said inner shaft.
scoped shafts and causing said shafts to rotate
' 9. In an engine having a plurality of independ
independently in the same direction and means
ently rotated telescoped shafts, means for rotat
whereby the R. P. M. of the inner shaft is sup
ing the inner shaft independently of the outer
plemented by the R. P. M. of the outer shaft.
shaft and means for rotating the outer shaft in
2. In an engine, the method of transmitting
dependently of the inner shaft, whereby the said
the power of a prime'mover to co-axial tele
shafts rotate in concert to affect the R. P. M. of
scoped shafts and‘causing said shafts to rotate
the inner shaft.
independently of each other whereby the R. P. M. 45
10. In an engine having a plurality of inde
of the inner shaft is varied by the R. P. M. of
pendently rotated telescoped shafts, means for
the outer shaft.
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rotating the inner shaft at an established rate
3. In an engine, the method of transmitting
of speed and means for rotating the outer shaft
the power of a prime mover through a plurality
at an established rate of speed, whereby the said
of co-ordinated systems of operation having c0
shafts rotate in concert to affect the established
axial‘ telescoped shafts rotating independently
rate of speed of the inner shaft.
and in concert in the same direction and means
whereby the R. P. M. of an inner shaft is supple
mented by the R. P. M. of an outer shaft.
JAMES B. BROCKHURST.
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