Improvements in Oil Pumps for Lubricating Engine Shafts and the like.
Year: 1899

page_text: Date of Application, 13th Dec.,
1899
Complete Specification Left, 7th Sept., 1900-Accepted, 13th Oct.,
1900
PROVISIONAL SPECIFICATION.
Improvements in Oil Pumps for Lubricating Engine Shafts and
the like.
I, MATTHEW PAUL, of Levenford Works, Dumbarton, in the County of Dum-
barton, North Britain, Engineer, do hereby declare the nature of this inven-
tion to be as follows, that is to say:-
My said invention has for its object to improve the construction and arrange-
ment of oil pumps for lubricating engine shafts and the like, my improvements
forced lubrication
being specially designed for effecting what is known as
of high-speed engines.
"
"
In such pumps as hitherto constructed the discharge from the pump has taken
place through a port in one of the trunnions of the pump or through a port in
the bottom of the pump barrel the oil being led thence by pipes to the bear-
ings and shaft.
In carrying out my invention the pump barrel is carried by trunnions in
bearings its lower end being open to a chamber formed partly in one of the trun-
nions which chamber communicates with an oil reservoir through ports in the
bearing and trunnion. In the pump barrel there works a hollow plunger the
upper end of which is connected to an eccentric strap which works on an eccen-
tric formed or fixed on the shaft to be lubricated. The passage through the
plunger communicates with a circumferential groove in the eccentric and strap
from which groove a radial passage extends to a central passage formed in the
eccentric and continued through the shaft to the bearings to be lubricated.
When in use the action of the eccentric on the shaft causes the reciprocation
of the plunger and through it the oscillation of the pump barrel so that the ports
on the trunnion are alternately opened and closed. The ports are open on the
outward stroke of the plunger and it thus draws oil into the chamber communi-
On the return stroke of
cating with the lower open end of the pump barrel.
the plunger the ports are closed and a portion of the oil retained in the chamber
is forced through the hollow plunger into the circumferential groove in the eccen-
tric and strap and by means of the radial passage in the eccentric into the passage
in the shaft and thence through radial passages to. the various bearings to be
lubricated.
·
Tlfth day of December 1899.
Improvements in Oil Pumps for Lubricating Engine Shafts and
the like.
I, MATTHEW PAUL, of Levenford Works, Dumbarton, in the County of Dum-
barton, North Britain, Engineer, do hereby declare the nature of this inven-

page_text: tion and in what manner the same is to be performed, to be particularly des-
cribed and ascertained in and by the following statement, that is to say: -—
My said invention has for its object to improve the construction and arrange-
ment of oil pumps for lubricating engine shafts and the like, my improvements
being specially designed for effecting what is known as forced lubrication "
of high speed engines.
"
In such pumps as hitherto constructed the discharge from the pump has taken
place through a port in one of the trunnions of the pump or through a port in
the bottom of the pump barrel, the oil being led thence by pipes to the bear-
ings to be lubricated..
According to my invention the discharge from the pump takes place through
a hollow plunger in the pump barrel the upper end of which plunger communi-
cates with a groove between an eccentric and strap and from this groove pas-
sages extend to the bearings to be lubricated.
And in order that my said invention and the manner of performing the same
may be properly understood I hereunto append a sheet of explanatory drawings
to be hereinafter referred to and showing by way of example two modifications
of my improvements.
Figures, 1, and 2, on the accompanying sheet of drawings are transverse sec-
tions at right angles to Figure, 3; and Figure, 3, is a longitudinal section of
one modification of my improvements. Figure, 4, is an end elevation partly in
section; and Figure, 5, is a longitudinal section of a second modification of my
improvements. In these drawings the same reference letters are used to mark
the same or like parts wherever they are repeated.
In carrying out my invention according to the modification shown in Figures, 1,
to 3, the pump barrel, A, is carried diagonally by trunnions, B, C, in bear-
ings, D, E, formed in the bed plate, F, of the pump. The lower end of the pump
barrel, A, communicates through an opening, G, in its side with an oil chamber, H,
formed in one, B, of the trunnions, which chamber, H, communicates with an
oil reservoir or chamber, J, in the bed plate, F, through ports, K, L, in the
bearing, D, and trunnion, B, a pipe, M, leading from the reservoir, J, to any
suitable source of supply. In the pump barrel, A, there works a hollow plun-
ger, N, made in a piece with (or fixed to) an eccentric strap, P, which works on
an eccentric, Q, formed on (or secured to) the shaft, R, to be lubricated. The
passage through the plunger, N, communicates with a circumferential groove, S,
in the eccentric, Q, and strap, P, from which groove, S, a radial passage, T,
extends to a central passage, V, formed in the eccentric, Q, and continued through
the shaft, R, to radial passages (not shown) leading to the various bearings
which require to be lubricated.
When in use the action of the eccentric, Q, causes the reciprocation of the
plunger, N, and through it the oscillation of the pump barrel, A, so that the
ports, K, L, are alternately opened and closed. The ports, K, L, are open on
the outward stroke of the plunger, N, and it thus draws oil into the chamber, H,
which communicates through the opening, G, with the lower end of the pump
barrel, A. On the return stroke of the plunger, N, the ports, K, L, are closed
and a portion of the oil retained in the chamber, H, is forced through the hollo
plunger into the circumferential groove, S, in the eccentric, Q, and strap, P, and
by means of the radial passage, T, in the eccentric, into the central passage, U,
and thence through radial passages (not shown) to the various bearings to he
lubricated.
In the modification shown in Figures, 4, and 5, the pump barrel, A, is carried
vertically and the eccentric, Q, and strap, P, which work the hollow plunger, N,
is that used to actuate the valve gear (not shown) of the engine. A passage, V,
extends from the circumferential groove, S, in the eccentric and strap, through
the part connected with the lower end of the valve rod, W, so that oil can pass
to that bearing; and as shown by dotted lines in Figure, 5, diagonal passages, X,
also extend from the circumferential groove, S, through the crank shaft, R, to

page_text: the various bearings to be lubricated. If desired small pipes may be led from
one or more of these various bearings to other bearings or parts of the engine
so that the action of the pump will also force oil to these parts.
In the modification first herein before described the pump barrel is inclined
and in the second modification it is vertical but it is to be understood that the
barrel may be carried horizontally or at any desired inclination.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. In an oil pump for lubricating engine shafts and the like, a pump barrel
carried by trunnions in bearings, the lower end of the barrel being open to an
oil chamber communicating through ports with an oil reservoir, a hollow plunger
working in the pump barrel and connected to an eccentric strap, the passage
through the plunger communicating with a circumferential groove in the eccen-
tric and strap from which groove passages extend to the bearings to be lubri-
cated, substantially as herein before described.
2. In an oil pump for lubricating engine shafts and the like, hollow plunger
working in a pump barrel open to an oil chamber the upper end of which plunger
communicates with a groove between an eccentric and strap from which groove
passages extend to the bearings to be lubricated, substantially as hereinbefore
described.
3. The combination and arrangement of parts constituting my improved oil
pump, substantially as herein before described and as shown in Figures 1, 2,
and 3, of the accompanying drawings.
4. The combination and arrangement of parts constituting my improved oil
pump, substantially as hereinbefore described and as shown in Figures 4, and 5,
of the accompanying drawings.
Dated this Fifth day of September 1900
EDMUND HUNT,
Applicant's Agent.