NZ720758A - Piston-chamber combination - Google Patents
Piston-chamber combinationInfo
- Publication number
- NZ720758A NZ720758A NZ720758A NZ72075816A NZ720758A NZ 720758 A NZ720758 A NZ 720758A NZ 720758 A NZ720758 A NZ 720758A NZ 72075816 A NZ72075816 A NZ 72075816A NZ 720758 A NZ720758 A NZ 720758A
- Authority
- NZ
- New Zealand
- Prior art keywords
- chamber
- piston
- sealing
- longitudinal
- sections
- Prior art date
Links
- 238000007789 sealing Methods 0.000 claims abstract description 132
- 239000000203 mixture Substances 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000000725 suspension Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 230000002787 reinforcement Effects 0.000 claims description 36
- 238000005086 pumping Methods 0.000 claims description 7
- 239000006096 absorbing agent Substances 0.000 claims description 6
- 230000035939 shock Effects 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 13
- 238000005452 bending Methods 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- 230000002708 enhancing Effects 0.000 description 2
- 240000003139 Ferula foetida Species 0.000 description 1
- 240000003598 Fraxinus ornus Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 125000000267 glycino group Chemical group [H]N([*])C([H])([H])C(=O)O[H] 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Abstract
piston-chamber combination comprising chamber (1) which is bounded by an inner chamber wall (4), and comprising a piston in said chamber (2) to be engagingly movable relative to said chamber wall (4) at least between a first position and a second position of chamber (2), said chamber (2) having cross-sections of different cross-sectional areas and differing circumferential lengths at the first and second longitudinal positions, and at least substantially continuously different cross-sectional areas and circumferential lengths at intermediate longitudinal positions between the first and second longitudinal positions, the cross-sectional area and circumferential length at said second longitudinal position being smaller than the cross-sectional area and circumferential length at said first longitudinal position, said piston (1) is comprising an member (12) for suspension of the sealing (8,9), said member (12) is rotatable, and said sealing (8,9) is comprising a separate part (6,6’) engaging the wall (4) of said chamber (2) and a sealing (8,9) made of elastically deformable impervious material, and mounted on the piston rod (5). This is achieved by the piston (1) is produced to have a production-size of said separate part (6’) and said sealing (8,9) in the stress-free and undeformed state thereof in which the circumferential length of the piston (1) is approximately equivalent to the circumferential length of said chamber wall (4) at said second longitudinal position, the piston (1) being expandable from its production size in a direction transversally with respect to the longitudinal / circular direction of the chamber (2) thereby providing for an expansion of sealing (7) of the piston (1) from the production size thereof during the relative movements of the piston from said second longitudinal position to said first longitudinal / circular position, one end, closest to a second longitudinal / circular position of the chamber, the sealing (5,5’) is embedded in a separate part (6,6’), said sealing (8,9) of the piston (1) is comprising sealing sections (19,20; 51,51’) in a direction along the piston rod (5), said sealing (7) is updivided in said sections over the circumference of said sealing (7), and, the angle (δ,ω) in-between two adjacent sealing sections is much less than 180°, one other end, closest to a first longitudinal / circular position of the chamber, said sealing (7) is updivided in said sections over the circumference of said sealing (7), and, the angle (ε,Ψ) in-between two adjacent sealing sections is bigger than said angle (δ,ω). ross-sections of different cross-sectional areas and differing circumferential lengths at the first and second longitudinal positions, and at least substantially continuously different cross-sectional areas and circumferential lengths at intermediate longitudinal positions between the first and second longitudinal positions, the cross-sectional area and circumferential length at said second longitudinal position being smaller than the cross-sectional area and circumferential length at said first longitudinal position, said piston (1) is comprising an member (12) for suspension of the sealing (8,9), said member (12) is rotatable, and said sealing (8,9) is comprising a separate part (6,6’) engaging the wall (4) of said chamber (2) and a sealing (8,9) made of elastically deformable impervious material, and mounted on the piston rod (5). This is achieved by the piston (1) is produced to have a production-size of said separate part (6’) and said sealing (8,9) in the stress-free and undeformed state thereof in which the circumferential length of the piston (1) is approximately equivalent to the circumferential length of said chamber wall (4) at said second longitudinal position, the piston (1) being expandable from its production size in a direction transversally with respect to the longitudinal / circular direction of the chamber (2) thereby providing for an expansion of sealing (7) of the piston (1) from the production size thereof during the relative movements of the piston from said second longitudinal position to said first longitudinal / circular position, one end, closest to a second longitudinal / circular position of the chamber, the sealing (5,5’) is embedded in a separate part (6,6’), said sealing (8,9) of the piston (1) is comprising sealing sections (19,20; 51,51’) in a direction along the piston rod (5), said sealing (7) is updivided in said sections over the circumference of said sealing (7), and, the angle (δ,ω) in-between two adjacent sealing sections is much less than 180°, one other end, closest to a first longitudinal / circular position of the chamber, said sealing (7) is updivided in said sections over the circumference of said sealing (7), and, the angle (ε,Ψ) in-between two adjacent sealing sections is bigger than said angle (δ,ω).
Description
Piston-Chamber Combination 19655—PC'I‘ 01—06—2015
TECHNICAL FIELD
A piston-chamber combination comprising a chamber which is bounded by an inner r
wall, and sing a piston in said chamber to be engagingly movable relative to said
chamber wall at least between a first position and a second position of the chamber,
said r having cross~sections of different cross-sectional areas and differing
circumferential lengths at the first and second longitudinal positions, and at least ntially
continuously different cross—sectional areas and circumferential s at intermediate
longitudinal positions between the first and second longitudinal positions, the cross-sectional
area and circumferential length at said second longitudinal position being smaller than the
sectional area and circumferential length at said first longitudinal position, said piston is
comprising an member for suspension of the sealing, said member is rotatable, and said g
is sing a separate part engaging the wall of said chamber and a sealing made of
elastically deformable impervious material, and mounted on the piston rod.
BACKGROUND OF THE INVENTION
This invention deals with solutions for pistons in general, and specifically ning
reliability and life time.
In order to optimize the reduction in working force of a piston pump, the difference in cross—
nal area’s at a first longitudinal / circular on and that of a second longitudinal /
circular position should be as big as possible. This demand is contrary the life time and
reliability demand of the elastically deformable material of a piston, of which at least a
(separate) part is sealingly engaging the wall of said chamber (W02000/000227,
W02013/026508). Specifically e.g. of a fast moving piston will the 3-dimensional change in
size of the material of the sealing become a limit for the speed of the , for the energy used
and for the life time.
/000227 shows longitudinal chambers with a constant circumference where the
change of the dimensions of the material of a piston within said chambers is solely 2—
dimensional, as the sealing of said last mentioned pistons is only bending, so that the maximum
speed of said pistons may be higher than those where a 3-dimensional change of the dimensions
of the sealing is necessary.
However, chambers with a constant circumference may not be easy to produce, and may
therefore be expensive.
OBJECT OF THE INVENTION
The object is to provide an optimalisation of the functionning of any kind of a
combination of a piston and a chamber, and in particular as a pump.
Y OF THE INVENTION
In the first aspect, the ion relates to a combination of a piston and a chamber,
wherein: one end, closest to a second longitudinal / circular position of the chamber, the sealing
of said piston is embedded in a te part, said te part is sealingly engaging the wall of
said chamber, at least from a first— to a second udinal / circular position of the r,
n said sealing of the piston is build up by (e.g. plane) sections of which, at least at a
second udinal / circular position, the in-between angles are less than 180°.
The basis of this new construction design of the piston is that of Figs. SA—SH of WOZOOO/
000227, and regardng said separate part it is Figs. 8OA*J and Figs. 81A—D ofW02013/026508.
The separate part is comprising a sealing means e.g. an O—ring which has a bigger cross-
sectional area in a cross-section through the centre axis of said chamber, which may be elongate
or circular, at a second longitudinal / circular position of said chamber, than its cross-section at
a first longitudinal / circular position. Said O-ring is preferably ed to at least one of the
members with reference number 43 (W02000/000227), so that it can than expand its
circumferencial length from said attachment point of at least one member 43, y its cross-
sectional area in a plane through the centre axis of the piston, will become smaller, when
extended, when said piston is moving from a second to a first longitudinal / circular position of
the chamber. When said sealing of the piston is embedded in said O-ring, in such a way, that
the sealing can change shape by solely bending the elastically deformable material of said
sealing, instead of a 3-dirnensional change of its size by stretching said material, when said
piston is moving from a second to a first longitudinal / circular position, the life time of said
sealing can be extended very much, while the change of the size of the sealing of the piston
according to smilar changes of the size of the wall of the chamber can be performed much
quicker and with less energy used. At a second longitudinal / circular position of the chamber
may the sealing ns of said sealing be preferably formed as folded planes, when
surized, like that of a shade. Another preferred form of the sealing section is that of a
curve. When said piston is moving to a first longitudinal / circular on, the common line,
the fold, in—between two adjacent sections of the shade formed sealing of the piston will become
farther away from each other, because the circumference of the material of the O-ring is being
extended. Thus, the in-between angles of plane sections, having a common folding line closest
to the sealing of said piston, which may be less than 180’ ° °
or 90 or 45 at said second
longitudinal / circular position of the chamber, are becoming bigger. Said angles, when the
piston has arrived at a first longitudinal / circular position, may preferably to become less than
180°, in order to enabling backwards folding of the plane sections of said piston sealing, when
the piston is moving towards a second longitudinal position. This is also valid for a similar angle
between s of curves of a curved sealing. Other section forms than plane or curved may
also be possible.
In a second aspect the invention relates to a combination of a piston and a chamber
wherein the sealing is shaped like that of a shade.
Thus the sealing of the piston may comprise several adjacent wall sections, continuously
positioned along the curcumference of said sealing, which may preferably be plane, which have
an in-between angle less than 180° in a cross-section of the shade formed sealing sections of
said , in a plane which is perpendicular the fold of two said adjacent wall sections. The
above mentioned in this sub-chapter is also valid for curved ns.
In a third aspect the invention s to a combination of a piston and a chamber,
n the reinforcement of said sealng is positioned at least in a fold of said shade.
A non—stressed sealing of the piston makes it vulnerable for forces working approx.
perpendicular on its surface. Which is why it is necessary to reinforce it. The reinforcement may
comprise of several closely lying reinforcement strings from the turning point of said sealing
approx. parallel to a common folding line in—between adjacent sections of said sealing, and
ending in said O-ring. At least should said common folding line comprising such a string as
reinforcement. It is also able to have additional reinforcements, positioned in a certain
angle (e.g. 90°) to said reinforcement strings. This may also be valid for curved sealings.
In a fourth aspect the invention relates to a combination of a piston and a chamber,
n the sealing of said piston in a longitudinal / circular cross-section of said chamber is
having an at least approx. 60° with the central axis of said chamber.
As an additional solution for the problem of minimilization of the stresses of the elastically
able g material of the sealing of the piston, may the length of said sealing of the
piston projected to a plane through the central axis, be bigger than the radius of the chamber. A
preferred angle between the g of said piston and the central axis of the chamber may be
. 60°. A bigger angle may be an option, but this will reduce the stroke length, and thus
the stroke volume, and thus the pumping speed.
In another way, in order to avoid ing the elastically deformable material of the sealing the
turning point of the member may be nearby the end of the vulcanisation stroke of said sealing
on the piston rod, which is the g point of the shade formed sealing. This may be done
virtually as well, due to the fact that the turning point of said member is difficult to merge with
the end of a vulcanisation stroke. When combined with e.g. the shade formed sealing of the
piston may the life time of the piston be optimized.
In a fifll aspect the invention relates to a combination of a piston and a r,
wherein each section of the shade formed sealing of the piston is comprising a reinforcement,
said reinforcement is lying outside a common folding line in—between adjacent sections of said
shade shaped sealing. Because the sections are not changing size in a direction in relation to the
centre axis of the chamber, said ns may comprise a reinforcement which may prevent the
section to bend of even deform in 3-dimensions under pressure.
For a good fuctionning of the piston is it necessary that the O-ring is following the shape (in
case of constant circumference type chamber) and/or the size of the chamber wall (in case of a
chamber with a preferred circular transitional cross—sectional section), when the piston is
moving from a 2"d to a 1St on of said chamber. In a pump where only the pumping stroke is
from 15' to 2nd chamber postions, during a stroke from 2'Kl to 1‘t positions the O-ring may
preferably be engagingly-, but not be sealingly communicating with the wall of said chamber —
in order to lower on forces. The shown coil spring is providing this t, and said spring
may be fastened to one or more members. During the pumping stroke will there be
overpressure under the piston seal, which willpush the g ds towards the O—ring, the
last mentioned being pushed to the wall of the chamber, now communicating sealingly with the
wall of said chamber.
For a continuously good functionning of the piston is an correctly folding back of said shade
sealing nessary, when the piston is performing a pumping stroke (1‘t to 2‘1d position of the
chamber). The folding back will go inwards, while under al (over)pressure. Said
overpressure may prohitbit an intended folding back — however, this will not influence the
piston function as such, when the sealing sections and the folds are not begin to communicate
with the wall of said chamber, which would give friction and lower life time of said sealing. In
order to support an intended folding back, the folds but also the sections of the sealing may
comprise reinforcement strings. Firstly when the pressurized medium has exited the chamber,
reducing the overpressure inside the piston, an ‘blown up’ sealing will fold back to its
tion size. A solution for obtaining a t folding back during the pumping stroke, may
be that there is a seal embedded in the O-ring, which is ng in a transitional cross-section of
the piston. Here may also be folds existing like a shade, according to the shape of a seal in a
foam piston of Fig. 7B of W02000/065235, in order to prevent 3D- hing, enhancing its life
time. The piston may than have a venting hole from the internal space within the sealings and
the piston rod to the atmosphere, so that the piston internally can ‘breath’, avoiding undesired
overpressure. The size of said venting hole may be tuned in such a way that there is a little
overpressure, so that the O-ring during the pumping stroke is gly communicating with the
wall of the chamber. The above mentioned in this apter may also be valid for curved
sealing sections.
The chamber, which very well can be combined with these preferred embodiments of the
piston, is of a classic type with continuous circular transitional cross—sections, thus less
expensive than those for pistons having a constant circumference of the contact area of the
sealing with the chamber.
In a sixth aspect the invention relates to a combination of a piston and a chamber,
wherein the member may have a chamgeble , by menas of a portion whichis table,
e.g. at a second longitudinal / circular position of the chamber, due to a non-merge of turning
points for the sealing and the member.
The purpose of a pistonthamber combination defines when a piston needs to be sealingly
communicating with the wall of the chamber. In a pump, preferably this should happen when
the piston is moving from a first to a second longitudinal / circular position of the chamber. In
an or this should preferably happen when the piston is moving from a second to a first
longitudinal / circular position of the chamber. When the actuator is comprising two pistons,
the movement can also be from a first to a second longitudinal / circular position of the
chamber. In a shock absorber it may preferably be to have the piston sealingly communicating
with the wall of the chamber when the oil inside needs to be compressed — this may be
preferably both from a second to a first udinal / circular position of the r and from
a first to a second longitudinal / circular position of the chamber, optionally from a first to a
second udinal / circular position of the chamber.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, preferred embodiments of the invention will be described with reference to the
drawings wherein:
Fig. 1 shows left of the central axis a longitudinal cross-section of a piston at a first
longitudinal position of an elongate r — at the right side of said axis,
the same, but now at a second udinal / circular position of the
chamber.
Fig. 2 shows the sion of the s at the piston rod for the support of the
O-ring — top view at the left of the central axis and bottom view at the right
thereof.
Fig. 3A shows a scaled up view X of Fig. 1, of the difference in the folding of the
sealing of the piston at first and second udinal / circular positions of
the chamber.
Fig. 3B shows an enlargement of the folding of the sealing of said piston shown in
Fig. 3A at a first longitudinal / circular position of the chamber.
Fig. 3C shows an enlargement of the folding of the sealing of said piston at a second
longitudinal / circular position of the chamber, shown in Fig. 3A.
Fig. 4A shows a scaled up viewX of Fig. 1, of the difference in the enrolling of the
sealing of the piston at first and second longitudinal / ar positions of
the chamber.
Fig. 4B shows an enlargement of the tion size and shape of the sealing of said
piston shown in Fig. 4A at a second longitudinal / circular position of the
chamber.
Fig. 5A shows a detail of Fig. 1 of the sealing and assembly of the O-ring, when the
piston is at a 1‘( longitudinal / circular position of the chamber.
Fig. 5B shows a detail of Fig. 1 of the g and assembly of the O-ring, when the
piston is at a 2nd longitudinal / circular position of the chamber.
Fig. 5C shows the suspension of the O-ring by a member.
Fig. 6 Shows an alternative suspension of the O-ring by a flat .
Fig. 7 shows the piston of Fig. 1, now further comprising a sealing surface
3O embedded in the O-ring and vulcanized to the piston rod.
Fig. 8A shows a part of a plane - type g surface with a fold, and reinforcement
strings.
Fig. 8B shows a part of a curve — type sealing surface with reinforcement strings.
DESCRIPTION OF PREFERRED EMBODIMENTS
Fig. 1 shows two longitudinal cross-sections of a piston 1, 1’ in an te chamber 2.
The centre axis 3 of said chamber 2, 2’. The internal wall 4 of the chamber 2. The piston rod 5.
The O-n‘ng 6 (at a first unal position) and 6’ (at a second longitudinal on). In said O—
ring 6, 6’ is a sealing 7 embedded, comprising an impervious layer 8 and a reinforcement layer
9. Said O-ring is vulcanized to the piston rod 5 at spot 10. Other forms of mounting the piston
on the piston rod 5 are possible, e.g. on a cylinder formed end which has within an O-ring (as
shown in W02000/070227), n said cab is mounted within a pair of closing rings, which
have been mounted on the piston rod. Very nearby said spot 10 is the centre 11 of the turning
point 11 of the arm 12, which ts said O-ring. Said turning point is comprising an axel 13
and a suspension 14 of the arm 12. Said suspension 14 is sealingly mounted on the piston rod 5.
The cross-section of the piston 6 and the chamber 2 is shown left of the centre axis 3. The radius
of said chamber 2 is at said first longitudinal position ‘a’. The angle a is the angle between the
line 15 straight between centers of the turning points 11 and the center 17 of the O-ring 6 of the
member 12 and a horizontal line 16 which is perpendicular the centre axis 3. The diameter x of
said O-ring 6 has been reduced substantially in relation to the er y of said O—ring 6’ at a
second longitudinal position. The circle segment ‘t’ shows the movement of the centre 17 of said
O-ring when said piston is moving between first and second longitudinal positions. The circle
t ‘5’ shows the rotation of arm 12, turning around said axle 13 through the centre 17 of
said O-ring when said piston 1 is moving between first and second udinal positions. The
circle segment ‘t’ shows the rotation around the middle of the sealing just under the bottom of
the vulcanisation on said piston rod 5 of the centre 17 of said O-ring when said piston 1 is
moving between first and second longitudinal ons. The difference ‘c’ at a second
longitudinal position shows that the sealing is stretched a length ‘c’ in comparison with the
sealing length at a first longitudinal position. Said diffrence ‘c’ needs to be as small as possible,
in order to avoid ing the sealing, thereby enhancing life time. The t curves 49 and 50
of the centres 17 and 48, of the coil spring 34 and the O-ring 6,6’, respectively when the piston
is moving from a first— to a second longitudinal / circular position of the r.
The cross-section at a second longitudinal position is showing right of the centre axis 3 the
piston 1’ at a second longitudinal position of said chamber 2’. The radius of said chamber 2’ is at
said second longitudinal position ‘b’. The angle B is the angle between the line 15 and the
centre axis 3 of the piston 1’. ‘g’ is the diameter of the 0an 6 at the first longitudinal / circular
position, which is smaller than ‘h’, which is the diameter of the O-ring 6’ at a second
longitudinal / circular position. Both diameters are measured in a cross—section in a plane
through the centre axis 3 of the chamber 2, 2’.
View X is shown in Figs. 2, 3A and 4A.
The coil spring 34 (see also W02000/000227) which is pressing the O-ring 6, 6’ onto the
internal wall 4 of the chamber 2, is shaped such, that O—ring 6, 6’ is supported in pressing itself
onto said al wall, thereby enabling a proper sealing. Said spring is suspended by an holder
38 at the end of the member 12. At a 1St position of the chamber is said member positioned at
the very end of said arm 12. At a 2'“1 position of the chamber 2’ has said coil spring 34 be
turned, in relation to its position at said 1St position of re chamber, in a plane through said
centre axis 3. Said holder 38 is shaped in such a way that it allows a torsional turn of said coil
spring 34. At said 2“d on of the chamber 2’ is said holder 34’ positioned farthest from the
end of said member 12. The change of the position of the holder 38,38’ is done by a stop 39.
This enables the sealing to be unstressed at said on, and this enlarges life time. See Fig. 5B
for the holder 38,38’ in its end position and its retracted position, farthest from the end of the
memebr 12. The diameter of said O-ring is ‘h’. In this drawing is only one member shown — no
other members are are shown.
Fig. 2 shows the combination as View X of Fig. 1. Not shown is the sealing 7 of said
piston 1, 1’. Shown is said combination at a 1St longitudinal / circular position of the r
with a chamber radius ‘a’, and at a 2“d longitudinal / circular position of the r with a
chamber radius ‘b’ — in between is the centre lines 29, 30 of the chamber 2, 2’. The circle 32, 32’
shows the sealing of the O-ring 6, 6’ against the inner chamber wall 4, 4’. The diameters ‘j’, ‘k’ of
the O-ring 6, 6’ at a 1St and 2“d longitudinal / circular position of the chamber resp. radius ‘a’ >
radius ‘b’. The coil spring 34, 34’ at the 1St and 2nd longitudinal / circular position of the
chamber, resp. The centre lines 36, 36’ of the O-ring 6, 6’, resp. The centre lines 35, 35’ of the
coil spring 34, 34’, resp.
Fig. 3A shows schematically the X view of Fig. 1. One r with details of the
sealing 7 is shown. Neither arms 12 nor the suspension 14 is shown: please see Fig. 2. The O—
ring 6’ at a second longitudinal on has a big er ‘y’, and this thickness is being used
to enabling the embeddiness of a shade folded sealing 7 by vulcanisan'on into said O—ring 6’.
Each fold 21 is comprising two nt unstressed sealing section planes 19 and 20, resp. of
flexible g material. There are totally 34 folds 21. The centre axis 3 and the piston rod 5.
Figs. 38 and 3C shows s of said fold 21 which is comprising two adjacent
unstressed sealing section planes 19 and 20, resp. of flexible sealing material. The in—between
angle 5, at a 2nd longitudinal / circular on of the chamber is smaller than the same in-
between angle 8 when the piston 1 is on a first longitudinal position. The angle E is less than
180°. The length of the unstressed flexible sealing 7 material ‘e’ (Fig. 3B), when the piston 1 is
at a first longitudinal position, is approx. the same as length ‘d’ (Fig. BC) when said piston 1 is
at a second longitudinal position. The transitions 21 and 22, resp. of each adjacent par 19 and
, resp. are rounded off. Within the sealing 7 material are reinforcements positioned, e.g. 23
and 24, ably positioned within the transitions 21 and 22, respectively. Reinforcements
may also be within the section planes 19,20 (reinforcements not shown). The production of said
last mentioned reinforcements is simple, as said sealing sections are not stressed in a plane
through said planes — only to maintain the flatness of said sealing ns. The tion of
said reinforcements can be done by knitting.
The suspension 25 of the members 12 is having a tight fit with the piston rod 5. Five
members 12 are shown. Said members 12 are communicating with an axle 26, which have a
tight fit with the suspension 25. Said members can turn around said axles 26. The centre line 27
of said axle 26.
Fig. 4A shows a view X of Fig. 1, without showing members 12 — only the enrolling
type of the sealing 7, both at a seond and a first longitudinal longitudinal / circular position of
the r. This type of sealing is comprising sections 51,51’, which at a second udinal
postion of the longitudinal / circular chamber have their production size, show to have been
rolled together inwards in a direction to the piston rod 5, and farthest from the piston rod 5
have the separate part’s O-ring 6’ as border. The angles n the reinforcements (v0 and the
one between the surfaces (x) are shown in Fig. 4B, and are much smaller than 90’ . Said
sections 51 fill a complete circumference at a second chamber n. At a first longitudinal /
circular on of the r are said sections 51’ rolled out into a continuous surface by
bending the material only: the in-between angle lu between two sections 51’ is just below the
180. It depends on the size of the diameter of the chamber at a second longitudinal / circular
position of the chamber, as how long a part of said ns are in the direction to the center
point in a transitional cross-section of the piston, thus how big the maximum size is of the
circumference at a first chamber poisition. Also is said size depending on the m pressure
of the pump, as said pressure works internally of the sealing in a direction opposite the folding
in of said sealing: the smaller the maximum pressure of the medium is, the bigger the size of the
circumference at a first longitudinal / circular position of the chamber can be, the bigger the
possibility of saving energy. In relation to the size of the folding type of sealing, according Figs.
3A—B (incl) is the current maximum size at a first longitudinal / circular position of the
chamber approximately 1/2 of that (size ‘a’). The ‘b’ size is the same as in Figs. 3A-B ). The
width ‘k’ of the O-ring 6’. The change of on ‘m’ of the outer border 50’,50 of the g 7.
Fig. 4B shows an enlargement of the production size and shape of the sealing 7 of
said piston shown in Fig. 4A at a second longitudinal / circular position of the chamber. More
details are shown here, e.g. the reinforcement strengs 52, on the middle of circle segments 53
and 54. On top of the sealing 7 are said ends of the reinforcements 52 shown with reference
58. From a second to a first longitudinal / circular position of the chamber is the rolling out of
the production shape of said sealing type as follows: both angles to and E, at a second
longitudinal / ar position of the chamber become angle W, as shown in Fig. 4A at a first
longitudinal / circular position of the chamber. In order to avoid arizing of cracks, holes 55
have been positioned at the end of two ntly placed legs 56 and 57 (schematically drawn)
of the circle segments 53 and 59.
Fig. 5A shows an ed detail of Fig. 1, where the inner wall 4 of the chamber 2 at a
1St position of said chamber is sealingly communicating with the sealing 7 of the piston 1 by the
separate part’s O-ring 6. Said sealing is sing of a reinforcement 9, and at least one layer
of impervious elastically able materal 8. Said reinforcement is an addition to the
reinforcements in the folds 18 between sections 19, 20 (see Fig. 3C). The O-ring 6 is vulcanizd
to said sealing sections 8 — see the hatch differences. The O-ring 6 is supported by a coil spring
34 atically drawn). Said coil spring has a part 44 of the circle round cross-section, which
can turn over an angle Czin order to support the expansion of the O-ring 6 — this is done here by
ning a coil of said coilspring — other support methods are possible too. The member 12 is
comprising a portion 37 which is formed with a shaped holder 38 which is having a similar
circle round shape as the outside shape of said coil spring, optimizing the support of the
coilspring 34. The centre 17 of said O-ring, and the centre 48 of the coil spring 34.
Fig. 5B shows an enlarged detail of Fig. 1, where the piston 1’ is at a 2ml longitudinal /
circular position of the chamber of the chamber 2’. Fig. 5B has the same scale as Fig. 5A. The
piston rod 5, and the internal wall 4’ of the chamber 2’. The O-ring 6’ is engaging sealingly said
internal wall 4’. The member 12’ is positioned almost parallel to the piston rod 5. The portion
37 has been retracted (36’) from the end of the member 12’, so as to enable the sealing 7 is not
stretching the length ‘i", which otherwise would shorten the life time of the piston 1’. The length
‘f‘ is shown being the length between said centre 48 and the centre 48’ of the retracted portion
37’. The stop 39, which is mounted on the piston rod 5, is stopping the synchrone movement of
holder 38 with the movement of member 12’, and ends with the position of holder 38’, when
the piston is moving to a second longitudinal / circular position of the chamber. The holder
38,38’ may have a spring 40 (not shown), which reverses the repositioning of holder 38’ to 38,
when the piston is moving to a 1St udinal / circular position of the r.
Fig. 5C shows tically the suspension of the O-ring 6 to a member 12. The hinge
63 is at one end 62 embedded in the O—ring 6 (preferably in the centre 17), while at the other
end rotatably d in turning point 64. At the opposite end of said turning point 64 is a
hinge 65 mounted. The last mentioned hinge 65 is mounted on the portion 37 of the member
12. Preferably is the hinge 63 rotatable over angle y in a plane perpendicular the axle 13 of a
member 12, around an internal axle 68 of said turning point 64, and said axle 68 is positioned
in the centre point 48 of the coil spring 34’. The hinge 63 may be updivided in 2 parts, which
can slide in each other (not shown), so as to adapt dimensions.
Fig. 6 shows an alternative on for the coil spring 34,34’. The flat spring 66 is
mounted by a bold and nut connection on a member 67, which at the other side is vulcanized
on the O-ring 6,6’. Said flat spring 66 is mounted at its other side on the piston rod 5 (not
shown).
Fig. 7 shows the piston 1 of Fig. 1, now r comprising a sealing surface 60,60’
embedded in the O-n‘ng 6,6’ and vulcanized onto the piston rod 5. Said sealing surface 60’ is
folded when the piston 1’ is at a 2nd longitudinal / circular position of the chamber. The
venting hole 61, which is positioned in the suspension 68 of the members 12, and is
connecting the inner volume 69,69’ of said piston and said sealing surface 60,60’, with the
outer part 70 of the r 2, and the atmosphere 71, through the venting hole 72 in the cab
Fig.8A shows tically a part of a plane — type sealing. The fold 74 connects
two planes 75 and 76, which are comprising reinforcement strings 77 and 78, both parallel to
said fold 74 (alike as earlier shown in Fig. 3C). Said fold has a reinforcent 79. Additionally
reinforcement s 80 and 81, which are connected to said rcement strings 77, 78 and
79, and shown dicular to said reinforcement strings 77, 78 and 79. This 90 angle may
be different (not shown). The centre axis 82 of the fold 74.
Fig. 8B shows schematically a part of a curved — type sealing. The vertically shown
reinforcements 83, 84 and 85 are positioned alike shown in Fig.4B. The reinforcement strings
86, 87, 88 and 89 are shown laying a certain constant distance from each other, and are
connected to said reinforcement strings 83 ~ 85 (incl), and shown perpendicular to said
reinforcement strings. This 90 angle may be different (not shown). Said strings 86 — 89
(incl) are positioned a certain distance from the other surface 90 of the sealing 91.
Claims (26)
1 A piston—chamber combination comprising a chamber (1) which is bounded by an inner chamber wall (4), and comprising a piston (1) in said r (2) to be engagingly movable relative to said chamber wall (4) at least between a first on and a second position of the chamber (2), said chamber (2) having cross-sections of ent cross-sectional areas and differing circumferential lengths at the first and second longitudinal positions, and at least substantially continuously different cross-sectional areas and circumferential lengths at ediate 10 longitudinal positions between the first and second longitudinal positions, the cross—sectional area and circumferential length at said second longitudinal position being smaller than the cross-sectional area and circumferential length at said first longitudinal position, said piston (1) is comprising an member (12) for suspension of the sealing (8,9), said member (12) is rotatable, and said sealing (8,9) is comprising a te part (6,6‘) engaging 15 the wall (4) of said chamber (2) and a sealing (8,9) made of elastically deformable impervious material, and mounted on the piston rod (5), characterized by the fact that the piston (1) is produced to have a production-size of said separate part (6’) and said sealing (8,9) in the stress-free and undeformed state thereof in which the circumferential length of the 20 piston (1) is approximately equivalent to the circumferential length of said chamber wall (4) at said second longitudinal position, the piston (1) being expandable from its production size in a direction transversally with respect to the longitudinal / circular ion of the chamber (2) thereby providing for an expansion of sealing (7) of the piston (1) from the production size thereof during the ve movements of the piston from said second longitudinal on to 25 said first longitudinal / circular position, one end, t to a second longitudinal / circular position of the chamber, the sealing (7,7’) is embedded in a te part (6,6’), said sealng (8,9) of the piston (1) is comprising sealing sections (19,20; 51,51’) in a direction along the piston rod (5), said sealing (7) is updivided in said sections over the ference of said sealing (7), and, the angle (figw) ween two 30 adjacent sealing sections is much less than 180°, one other end, closest to a first longitudinal / circular position of the chamber, said sealing (7) is updivided in said sections (19,20;51,51’) over the circumference of said sealing (7), and, the angle (8e 24’) in—between two adjacent sealing sections is bigger than said angle (63»). 35
2. A -chamber combination according to claim 1, wherein said sealing sections are plane sections, having folds in-between said sections, said sections and said folds are comprising reinforcements, said reinforcements are communicating with each other.
3. A piston-chamber combination according to claim 1, wherein said sealing sections are curved sections, and are comprising in turning centres reinforcements which are positioned in a direcn’on along the piston rod, said sections are comprising rcements, said reinforcements are communicating with each other.
4. A piston-chamber ation ing to claim 2, wherein said angles are between 10 two adjacently positioned section planes.
5. A piston-chamber combination according to claim 3, wherein said angles are n two adjacently positioned reinforcement ends of turning centers in a transversal cross—section. 15
6. A piston-chamber combination according to claim 1, further comprising turning points for the sealing and for a member (12), wherein said turning points of are closely oned to each other.
7. A -chamber combination according to claim 1, further comprising a coil spring 20 for suspending said te part, said coil spring is comprising a part (44) which can turn over an angle 2
8. A piston-chamber combination according to claim 1, of which member (12) is r comprising a shaped holder 38, wherein said holder has a similar circle round shape as the 25 outside shape of said coil spring (34,34’).
9. A piston-chamber combination according to claims 1 or 8, wherein said shaped holder is part of a portion (37) of said member (12), wherein said portion is retractable, by a stop (39) which is mounted on the piston rod (5).
10. A piston-chamber combination according to claim 1, wherein the member 12 is having an angle 3, preferably approximately 60, with the center axis 3 of the piston rod 5.
11. A piston—chamber combination according to claim 1, wherein the turning point, spot 35 10 of the sealing 7, is positioned very nearly the center 11 of the axle 13 of the member 12.
12. A pump for pumping a fluid, the pump comprising: - a combination according to any of the preceding claims, - means for engaging the piston means from a on outside the chamber, - a fluid entrance connected to the chamber and comprising a valve means, and - a fluid exit connected to the chamber. - said separate part (6,6’) is sealingly engaging the wall (4) of said chamber (2), at least from a first to a second longitudinal / circular position of the chamber.
13. A pump according to claim 12 wherein the engaging means have an outer position 10 where the piston means is at the first longitudinal / circular position of the chamber, and an inner position where the piston means is at the second longitudinal / circular position of the chamber.
14. A pump according to claim 12 n the engaging means have an outer position 15 Where the piston means is at the second longitudinal / circular position of the r, and an inner position where the piston means is at the first longitudinal / circular position of the chamber.
15. A shock absorber comprising: 20 - a combination according to any of claims 1 to 11, - means for ng the piston means from a position outside the chamber, wherein the engaging means have an outer position where the piston means is at the first longitudinal position of the chamber, and an inner position where the piston means is at the second longitudinal position, 25 - said separate part (6,6’) is sealingly engaging the wall (4) of said chamber (2), at least from a first and a second udinal / circular position of the chamber.
16. A shock absorber according to claim 15, further sing a fluid ce connected to the chamber and comprising a valve means.
17. A shock absorber according to claim 13 or 14 further comprising a fluid exit connected to the chamber and comprising a valve means.
18. A shock absorber according to any of claims 15 to 17 wherein the chamber and the 35 piston means form an at least substantially sealed cavity comprising a fluid, the fluid being compressed when the piston means moves from the first to the second longitudinal / circular position of the chamber.
19. A shock absorber according to any of claims 15 to 17 further comprising means for biasing the piston means toward the first longitudinal / circular position of the r.
20. An actuator comprising: - a combination according to any of claims 1 to 11, - means for engaging the piston means from a position outside the chamber, - means for introducing fluid into the chamber in order to displace the piston means 10 n the first and the second longitudinal / circular positions of the chamber, - said separate part (6,6’) is sealingly engaging the wall (4) of said chamber (2), from a second to a first longitudinal / circular poition of the chamber or from a first to a second longitudinal / circular on of the chamber. 15
21. An actuator according to claim 20, further comprising a fluid entrance connected to the chamber and sing a valve means.
22. An actuator according to claim 20 or 21, r comprising a fluid exit connected to the chamber and sing a valve means.
23. An actuator according to any of claims 20 to 22 further sing means for biasing the piston means toward the first or second longitudinal / circular position of the chamber.
24. An actuator according to any of claims 20 to 23, n the introducing means comprise 25 means for introducing pressurised fluid into the chamber.
25. An actuator according to any of claims 20 to 23 wherein the introducing means are adapted to introduce a combustible fluid, such as gasoline or diesel, into the chamber, and wherein the actuator further comprises means for combusting the tible fluid.
26. An actuator according to any of claims 20 to 23 further comprising a crank adapted to translate the translation of the piston means into a rotation of the crank.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14075033.2 | 2015-05-30 | ||
EPPCT/EP2015/062101 | 2015-06-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ720758A true NZ720758A (en) |
Family
ID=
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