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Патент USA US2404470

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July 23, 1946.
Filed April 15, 1943
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(‘?aw/vase ZEME/V
Patented July 23, 1946
Alexander Zemen, Baltimore, Md.
Application April 15, 1943, Serial No. 483,211
1 Claim.
(01. 74-40)
side surfaces 8 will align closely with the internal
This invention relates to engines and more
wall surfaces!) of the case 1. These surfaces
particularly to the development of a system of
are suitably polished so the friction and rubbing
piston and connecting rod mechanisms suitable
against each other will be reduced to a minimum.
for straight-line travel and the avoidance of dead
The flat surfaces I I] are guided between strips
center objections. It has among its objects to
I I on the surfaces of the crank case, as indicated.
provide a reciprocating mechanism suitable for
Suitable lubricating devices I2 are ‘arranged for
piston, crank and connecting rod elements that
oiling the surfaces of the guides H. The guides
will secure a straight-line travel of the piston
‘ II are preferably apexed at [3 to facilitate this
without any tendency to side slap or swinging of
the connecting rod. It also has for its object to 10 action. The oil ?ows down to the pan M of
the crank case and reused again in the lubri
provide a simpli?ed manner of guiding connect
cating system [5. The Scotch yoke members are
ing rods so they will travel in straight lines with
formed with an oval like opening 16 in which
the least amount of vibration, and where lubri
crank pins l1 rotate and operate the members.
cation can be provided for in de?nite and pre
determined manner. Another object is to pro 15 The pins force the Scotch yoke in a straight-line
travel as they rotate. The crank shaft [8 with
vide a head for a connecting rod that will not
the crank elements [9 rotate to operate the pins
require a rounded space in the crank case pan
to take care of a rotating crank as it travels
I‘! in a usual manner.
The elements l9 are en
larged, as indicated, to ?t against the sides In
on the crank shaft, but to eliminate such con
struction by avoiding the use of a connecting rod 20 of the Scotch yoke members and guide the latter
between them. This keeps the Scotch yoke prop
head that has a rotative action.
erly aligned at all times and prevents any side
Other objects will become apparent as the in
wise- movement. This affords more assurance
vention is more fully set forth.
for the straight-line travel of the rods during
The conventional type of engine using the re
ciprocating principle requires a swinging con 25 their reciprocation.
necting rod, with a hinged connection to the pis
The operation of the arrangement seems to be
obvious and is therefore notdescribed in detail
ton itself and a crank that swings around in the
crank case. In this invention, the connecting
While but one form of the invention is shown
rod travels in a straight line and avoids the use
of a hinged joint at the piston connection. These 80 in the drawing and described herein, it is not
parts usually swing in a lateral plane as they
travel, and are substituted by parts that move
in one plane without sidewise oscillation. This
intended to limit this application" for patent to
this particular form, as it is appreciated that
other forms of construction could be made that
provides for less distortion wear on the piston
would use the same principles and come within
the scope of the appended claim.
cylinder walls and makes the stroke evenand
smoother. Lubrication can be arranged for same
more easily as the oil can be brought directly
to the piston without requiring a banjo connec
Having thus, described the invention, what isv
claimed is:
In a reciprocating engine, the combinationof '
a crank shaft, a crank case, and a cylinder casing
tion so commonly required. The connecting rod
head is restricted to a straight-line movement 40 ‘combined therewith, piston means inserted in said
cylinder casing and operating in a reciprocating
and avoids the use of a swinging head splashing
manner, piston rods adiustably attached at one
through the crank case and requiring substantial
end of the piston to form a rigid connection
lateral room to operate in.
thereto, and arranged to operate in a straight
In the drawing, which illustrates an example
line, a partitioned Scotch yoke member formed
of a device exemplifying this invention:
at the lower end of the piston rod and recipro
Figure l is a plan view of a ‘device embodying
cating therewith, guides for said Scotch yoke
the invention; Figure 2 is a side elevation of the
forming parts of the walls of the crank case, the
device partly in section; Figure 3 is an end ele
Scotch yoke being formed in two separate parts
vation of the device partly in section, and Figure
4 is a sectional view taken along the line 4-4 50 and joined together for ready attachment to a
crank shaft pin, the Scotch yoke being provided
of Figure 2.
with a symmetrical elongated slot formed at light
Similar reference characters refer to similar
angles to the center line of the pistons and piston
parts throughout the drawing.
rods, the slot operating the crank shaft as the
In the drawing, l represents the head of .a
reciprocating engine 2 having cylinders 3 in which :55 piston reciprocates in the cylinder_ said. crank
travel the pistons 4. The pistons have adjust
shaft having circular ?ywheel portions between
the crank pins, and said guides having a V shape
able extension shafts 5 that connect to flat
con?guration on both ends to direct lubricating
Scotch yoke members 6 at the flat sides In there
oil to the guiding surface.
of, split and constructed as indicated with screw
thread 2!] locking nut 2| and bearings 22. These 60
members 5 extend across the crank case 1 so their
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