close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2136070

код для вставки
Nov. 8, 1938.
2,136,070
A. BOKEMULLER
TWO-STROKE INTERNAL COMBUSTION ENGINE
Filed July 8,_ 1936
5
Jnveni'or
£0 Bo/rmuu El?
3r
'
_
100 90 a0 10 aa 50 40 30 2o 10 0 >10 .20 so 4050 so 10 Q-Q-M
Aframvzy
2,135,070
Patented Nov. 8, 1938
UNITED STATES- PATENT orrlcs - 'rwo-s'rnorm INTERNAL COMBUSTION
ENGINE
I
Alfred Bokemiiller, Gaggenau-Baden, Germany,
assignor, by mesne'assignments, to Sir W. G.
Armstrong Whitworth & C0. (Engineers) Lim
ited, Newcastle-upon-Tyne, England .
Application July 8, 1936, Serial No. 89,538
,
In Germany July 8, 1935
,4 Claims.
(on.
The present invention relates to‘ improved
' more particularly, to the control of the inlet
and/or outlet passages of an internal combustion
engine. While the invention is adapted for use
with any type .of internal combustion engine, it
that time through a crank-angle of 20° (from
100+80) , and when then the opening of the valve
passage commences at the point A the disk of
the valve has already attained a considerable
speed and in the-period of time t it will cover the
able scavenging of the cylinder or cylinders of
15. an internal combustion ‘engine.
Still another object of this invention is ‘the
provision of improved valve and valve'seat for‘
an internal combustion engine.
path b.
vision of an improved method for effectively
the invention resides in the combination and ar
1 rangement of parts and in the details of construc
tion hereinafter described and claimed.
The invention is illustrated diagrammatically
and by way of example on the accompanying
30 drawing on which:
Figure l‘is an axial section of the cylinder and
the piston and some adjacent parts of a two
stroke Diesel-engine, the outlet-passage of which
is controlled by the piston;
Figures 2 and 3 show each a portion otthe
35
valve disk and the adjacent portion of the seat
therefor, figures drawn to a greatly enlarged
scale relatively to Fig. 1;
Figure 4 shows details of Fig. 3, the scale being -
modified construction. ‘
f
Referring to Fig. l, i denotes the cover of the
45 cylinder, 2 denotes a cooling chamber in said
_ cover, and 3 an inlet passage. at the inner end of
-
oscillation principle beco e quite obvious if it is
' With the ‘foregoing and other objects in view
a
‘
- compared with the commencement of the stroke
‘which will appear asv the description ‘proceeds,
Figure 5 shows an explanatory diagram; and.
Figure 6 is a view similar to Fig. l snowing
-
The advantage which this operating valve pre- '
sents for a two-stroke en ‘ine operating after the
A further object of this invention is the pro- '
-
’
later, but always only after the valve disk 5 has
covered the path a (Fig. 4). This path a in Fig.
4 corresponds with the path a. in‘ the diagram
shown in Fig. 5. From the curve I in this ?gure,
it appears that the cam shaft has turned‘ during
Another object of this invention is the pro;
still larger.
.
with the rim zone 9*!‘ of the valve disk.‘ In ac-v
vision of means for obtaining effective and reli
L25
'
cordance with the length of the tightening sur
faces 9, 9“, the valve 4 will be opened earlier or
is of particular signi?cance in connection with it
two-stroke engine of the so-called “Diesel” type.
An object of this invention is the provision of
10 means for obtaining improved operation and ef
?ciency of an internal combustion engine.
scavenging the cylinders of an internal combus- _
123-65)
With special regard to the valve disk and its
seat, besides the usual conical seat 8, the latter
is provided with a collar-like additional seating
surface 9 (Figs. 2, 3 and 4) which co-operates
means for and method of engine control and,
tion engine.
.
curve '11 indicated by a dotted line in Fig. 5. ‘In
the same section of time t the valve only covers
the path c. Similar are the conditions when the
valve is being closed (point B of the curve I in
Fig. 5). The valve is closed with a considerable
speed-and its passage is already'blocked before
the speed of the closing movement of the valve
disk 5 has become considerably lower.
.
Referring again to Fig. l, it denotes the out
let of the machine and II denotes the working
piston of the same.
The inlet valve ll is so con
trolled that it opens a predetermined time after
the outlet slots have‘been uncovered by the pis-.
ton, and a waste gas column of high velocity has
arisen in‘ the outlet pipe, producing a vacuum as
high as possible in the cylinder. Furthermore,
the outlet pipe has such dimensions, particularly
such-a length, that a return'oi a portion of the
gas column cannot hinder the scavenging air
from entering into the cylinder. - The 'neces
sary dimensions can readily be found by experi
ment. As shown in Fig. 1.v a suitable device Illa
may be provided in the outlet pipe iii which is so
constructed as to partially prevent the return of
gas into the cylinder. As can readily ‘be seen,
the
device .lila allows almost totally unobstructed
face‘ 5 of which constitutes the top of a combus- . ?ow of the gases from the cylinder to the outer
A
' ~tion space 8 located axially in the cover i.
portion of the outlet pipe but will tend to catch 50
50 communicating iuel supply channel ‘I is likewise and obstruct the passage of such gases when're- '
provided in said cover and may extend radially
to the cylinder.
>
with respect to the axis of the cylinder and- some turning
Owing to the arrangement of the valve in the
what obliquely. as shown. For best. operation it manner
shown and described, the unreliable and
. w is important that the inlet passage is as short as
which is located adisk-valve _4, the bottom-sur
vIll possible and leads directly into theopen air.
I
variable portions of gas'movement at the com
2
_
2,136,070
mencement and at the end of the valve movement
are dispensed with. This is another advantage
‘ which this invention presents to which may be
added the further advantage that the valve disk
forms together with the valve of the wall aperture
a nozzle-like passage l2, viz., a passage having a
nozzle-like sectional area which may well be
utilized for a thorough dispersion or atomization
of the fuel as it passes into the combustion
10
chamber.
,
I wish to be understood that I consider it as
lying within the scope of my invention if the
combustion space 6 and the channel 1 are pro
vided at another-suitable place in the cylinder
head or at the cylinder, and the shape of said
parts of the engine may be quite as desired. In
stead of an injection nozzle an incandescence
body, a spark plug or the like may be provided,
the fact being that the invention can be used in
connection with internal combustion engines of
all constructional forms in which the entrance
of the scavenging air and of the combustion air
is effected or assisted by the sucking action of
the escaping exhaust gases.
,
‘
In this respect,v by way of example I refer es
pecially to Fig. 6 in which is represented a two
stroke internal combustion engine having an.in-~
let valve l3 and an outlet valve l4 in the cylinder
head. Also in this example the inlet passage I5
2H)
is as short as possible and communicates directly
with the open air, whereas the outlet passage I6
communicates with a nozzle-like exhaust pipe I1.
While I have herein shown and described only
certain embodiments of certain~ features of my
present invention it is to be understood that they
are to be regarded merely as illustrative and that
I do not intend to limit myself thereto except as
may be required by the following claims.
I claim:
40
'
~
,1. In a two-stroke cycle internal combustion
engine, in combination, a cylinder provided with
an exhaust ori?ce, a valve adapted to open and
close said ori?ce said valve comprising a disk,
.and a seating surface therefor positioned trans
versely with respect to the direction of motion
of the said disk, said seating surface having a
portion extending parallel to the direction of
motion of said disk, whereby said valve opens
only after said disk has travelled a predetermined
distance, means for opening said exhaust valve
to permit the burnt gases to be discharged from
the cylinder at high velocity and as a mass,Jeav
ing a high depression behind them, an inlet pas
sage communicating with the cylinder, a valve
adapted to open and close said inlet passage, and
means for opening said inlet valve when the said
depression has been created and a suction effect
is exerted at the inlet ori?ce.
3. In a two-stroke ‘cycle internal combustion
engine, in combination, a cylinder provided with 20
an exhaust ori?ce, a valve adapted to open and
close said ori?ce, means for opening said ex
haust valve to permit the burnt gases to be dis
charged from the cylinder at high velocity and
as a mass, leaving a high depression behind them, 25
an inlet passage communicating with the cylin
der, a valve adapted to open and close said inlet
passage, and means for opening said inlet valve
when the said depression has been created and
a suction effect is exerted at the inlet ori?ce, 30
each of said valves comprising a disk, and a seat
ing surface therefor positioned transversely with
respect to the direction of motion of said disk,
said seating surface having a portion'extending
parallel to the direction of motion of said disk, 35
whereby said valve opens only after said disk
has travelled a predetermined distance.
'
‘i. In a two-stroke cycle internal combustion
engine in combination, a cylinder provided with
an exhaust ori?ce, means for opening said ex
engine, in combination, a cylinder provided with . haust ori?ce to permit the burnt gases to be dis
an exhaust ori?ce, means for opening saidex
charged from the cylinder at high velocity and
haust ori?ce to permit the burnt gases to be
discharged from the cylinder at high velocity
and as a mass, leaving a high depression behind
them, an inlet passage communicating with the
cylinder, a valve adapted to open and close said
inlet passage, comprising a disk, and a seating
surface therefor positioned transversely with re
spect to the direction of motion of said disk, said
seating surface having a portion extending
allel to the direction of motion ‘of said
whereby said valve opens only after said
has travelled a predetermined distance,
par
disk,
disk
and
. _ means for opening said inlet valve when the said
depression has been created and a suction effect
is exerted at the inlet ori?ce.
,
2. In‘ a two-stroke cycle internal combustion
40
as a mass, leaving a high depression behind them,
an inlet passage communicating directly with the
atmosphere and with the cylinder, a valve adapt
ed to open and close said inlet passage, com-.
prising a disk, and a seating surface therefor
positioned transversely with respect to the di
rection of motion of said disk, said seating sur
face having a portion extending parallel to the‘
direction of motion of said disk, whereby said
valve opens only after said disk has travelled
a predetermined distance, and means for open
ing said inlet valve when the said depression has
been created and a suction effect is exerted at
the inlet ori?ce.
‘
ALFRED BOKEM?LLER.
50'
55
Документ
Категория
Без категории
Просмотров
0
Размер файла
353 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа