CN107642486A - A kind of Novel plunger pump static pressure supports side cover - Google Patents
A kind of Novel plunger pump static pressure supports side cover Download PDFInfo
- Publication number
- CN107642486A CN107642486A CN201711014748.7A CN201711014748A CN107642486A CN 107642486 A CN107642486 A CN 107642486A CN 201711014748 A CN201711014748 A CN 201711014748A CN 107642486 A CN107642486 A CN 107642486A
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- Prior art keywords
- side cover
- cover
- oil
- static pressure
- pressure support
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- 230000003068 static effect Effects 0.000 title claims abstract description 59
- 238000007789 sealing Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000003921 oil Substances 0.000 description 95
- 239000010720 hydraulic oil Substances 0.000 description 14
- 238000005299 abrasion Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 241000446313 Lamella Species 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- Reciprocating Pumps (AREA)
Abstract
The invention discloses a kind of Novel plunger pump static pressure to support side cover, including side cover enclosing cover and cover bush, cover bush is the external part that its inner side end of cover rim extends outside side cover, cover bush is provided with cavity along between its axial direction and side cover enclosing cover, covered outside side cover and oil duct system is set, static pressure support system is set on cover bush, and oil duct system is connected with static pressure support system.Static pressure support system includes oil road and several throttling roads, and oil road connects oil duct system along the axially arranged of cover bush, one end of oil road；The one end in throttling road is connected with oil road, and the other end is communicated in the side wall of inner chamber.By static pressure support concept, static pressure support system is set in side cover, makes to produce oil film in the side wall of side cover cavity, prevented from becoming directly contact generation friction between gauge rod and side cover cavity, solve the problems, such as that side cover easily wears.
Description
Technical field
The present invention relates to plunger pump field, and in particular to a kind of Novel plunger pump static pressure supports side cover.
Background technology
Plunger pump is an important device of hydraulic system, and it is moved back and forth by plunger in cylinder body, makes seal operation
The volume of cavity volume changes to realize that oil suction presses oil.Side cover is the important component of Variable plunger pump, because variable piston
The change gauge rod of pump will do the axial movement of high frequency in side cover, be applied so becoming gauge rod in the motion of side cover medium-high frequency due to becoming gauge rod
The power for being added in side cover is lateral, i.e., the power of one radial direction, so after prolonged motion, side cover can be caused easily to grind
Damage.
In the prior art, exactly whole side cover after machining terminates, heat treatment of integrally taking away, the hard of side cover is improved
Degree, wearability etc., improve the service life of side cover.But side cover heat treatment only improves the hardness, resistance to of side cover to a certain degree
Mill property etc., is not unlimited increase, by much time using, still can produce abrasion to the side wall of side cover.Existing side
Lid is to cover to set oil inlet and in-line outside side cover, by become gauge rod along side cover cavity outwards axially move when, will
Hydraulic oil sucks side cover from oil inlet, is flowed into by in-line in side cover cavity, realizes oil absorptive function；When becoming gauge rod along side cover
When cavity inwardly axially moves, force feed function is realized, but due to prolonged reciprocating, change gauge rod and side cover can be made
The side wall of cavity produces friction, wears side cover, influences the service life of side cover and the overall performance of plunger pump.
The content of the invention
In order to solve the above-mentioned technical problem, it is an object of the invention to provide a kind of Novel plunger pump static pressure to support side cover, leads to
Static pressure support concept is crossed, static pressure support system is set in side cover, makes to produce oil film in the side wall of side cover cavity, prevents from becoming gauge rod
Directly contact produces friction between side cover cavity, solves the problems, such as that side cover easily wears.For achieving the above object, originally
It is as follows to invent the technical scheme taken：
A kind of Novel plunger pump static pressure supports side cover, including side cover enclosing cover and cover bush, the cover bush are side cover
The external part that its inner side end of outer cover rim extends, the cover bush are had time along its axial set between the side cover enclosing cover
Chamber, the side cover cover the oil duct system that sets, static pressure support system, the oil duct system and institute are set on the cover bush outside
State the connection of static pressure support system.
Preferably, the outer cover rim of the side cover its it is axially arranged have through hole, the through hole is through the side cover enclosing cover and connects
The cavity, the end face outside of the side cover enclosing cover of the through hole end thereof contacts is provided with concave surface.
Preferably, the oil duct system includes the first oil duct system and the second oil duct system, and the first oil duct system is set
The first half in the side cover enclosing cover is put, the second oil duct system is arranged on the lower half of the side cover enclosing cover.
Preferably, the first oil duct system includes oil inlet and the first oil input channel, and the oil inlet and described first enters
Oil duct connects, and first oil input channel is circumferentially disposed along the side cover enclosing cover, and the upper end of first oil input channel extends to institute
The upper surface of side cover enclosing cover is stated, the upper end of the first oil input channel is closed by technique plug, the lower end of first oil input channel connection the
One oil-out, first oil-out are arranged on the bottom wall of the cavity.
Preferably, the second oil duct system includes the second oil input channel, and second oil input channel is along the side cover enclosing cover
Circumferentially disposed, the lower end of second oil input channel extends to the lower surface of the side cover enclosing cover, and the lower end of the second oil input channel is by work
Skill plug is closed, and the upper end of second oil input channel connects the second oil-out, and second oil-out is arranged in the cavity
Bottom wall on.
Preferably, the static pressure support system includes oil road and several throttling roads, and the oil road is along the side cover
Axially arranged, one end connection oil duct system of the oil road of bushing；The one end in the throttling road and the oil road
Connection, the other end are communicated in the side wall of the inner chamber.
Preferably, the static pressure support system is arranged on the upper end that the cover bush is located above the cavity；Or
The static pressure support system is arranged on the bottom that the cover bush is located at below the cavity；Or the static pressure support system
It is arranged on the upper and lower end of the cover bush.
Preferably, several balancing slits, circumferential cloth of the balancing slit along the cavity are set in the side wall of the cavity
Put.
Preferably, the end face outside of the side cover enclosing cover sets fabrication hole, one end of the fabrication hole and the oil road
Connection, the other end of the fabrication hole are closed by technique plug.
Preferably, the static pressure support side cover also includes seal assembly, and the seal assembly includes seal and sealing connects
Fitting, the sealed connecting component are connected through a screw thread with the through hole, and the seal is arranged on the sealed connecting component, institute
State seal to be placed in the concave surface and close the through hole, sealing ring be additionally provided between the seal and the concave surface,
The quantity of the seal is at least 1, and sealing ring can prevent hydraulic oil from oozing out.
Relative to prior art, the present invention achieves beneficial technique effect：
The plunger pump static pressure support side cover of the present invention covers outside side cover to be set oil duct system and is set on cover bush
Static pressure support system, it is connected by oil duct system with static pressure support system, hydraulic oil enters static pressure support system through oil channel system
System, makes to produce oil lamella in the side wall of side cover cavity, avoids directly contacting between change gauge rod and the side wall of cavity.Oil duct system bag
Include the first oil duct system and the second oil duct system, in the plunger pump course of work, axial direction is outwards done along side cover cavity by becoming gauge rod
Motion, hydraulic oil is sucked in cavity from the first oil duct system, then enters static pressure support system, liquid by the second oil duct system
When force feed flows in static pressure support system, throttling road serves the effect of fixed damping, and hydraulic oil enters from oil road to be throttled
Behind road, the oil pressure in oil road is changed after overdamp, the hydraulic oil after pressure change occurs and is transported to cavity
Between side wall and change gauge rod, stable oil film is formd, avoids to produce to contact between side cover cavity and change gauge rod and rubs, reduce
The abrasion of side cover.
The through hole of side cover is sealed by seal and sealed connecting component, can prevent hydraulic oil from being oozed out from side cover, is sealed
Part uses at least one, it can be ensured that sealing it is firm.Sealing ring is placed in the concave surface in the end face outside of side cover enclosing cover, can be with
Prevent sealing ring from moving, facilitate sealing ring to install.
Brief description of the drawings
Fig. 1 is the structural profile illustration that plunger pump static pressure of the present invention supports side cover；
Fig. 2 is that plunger pump static pressure of the present invention supports side cover and becomes the structural representation of gauge rod assembling.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments to the present invention
It is further elaborated, but the scope of protection of present invention is not limited to following specific embodiments.
Embodiment 1：
As shown in figure 1, a kind of Novel plunger pump static pressure support side cover, including side cover enclosing cover 1 and cover bush 2, side cover lining
Set 2 is the external part that side cover enclosing cover 1 extends along its inner side end, and cover bush 2 is set along between its axial direction and side cover enclosing cover 1
There is cavity 10, cavity 10 is provided on cover bush, and the inner side end of side cover enclosing cover 1 is the bottom wall 101 of cavity.The side cover
Enclosing cover 1 along its it is axially arranged have through hole, the through hole is arranged on the center or remaining position of side cover enclosing cover 1, described
Through hole is through the side cover enclosing cover 1 and is connected to the cavity 10, connects the through hole and the cavity 10, with the through hole
The end face outside of the side cover enclosing cover 1 of end thereof contacts is provided with concave surface 18, and the size of concave surface 18 is more than the size of the through hole,
One end of through hole is arranged in concave surface 18.It is to be integrally formed between side cover enclosing cover 1 and cover bush 2 in the present embodiment.
Oil duct system is set on side cover enclosing cover 1, static pressure support system, oil duct system and static pressure branch are set on cover bush 2
Support system connects.Side cover enclosing cover 1 is divided into the first half and lower half along its axial center line, and the oil duct system includes the first oil
Road system and the second oil duct system, the first oil duct system are arranged on the first half of the side cover enclosing cover 1, second oil duct
System is arranged on the lower half of the side cover enclosing cover 1.
The first oil duct system includes the oil input channel 4 of oil inlet 3 and first, and oil inlet 3 is arranged on the first half of side cover enclosing cover 1
Side wall on, the oil inlet 3 and first oil input channel 4 connect, week of first oil input channel 4 along the side cover enclosing cover 1
To setting, i.e. short transverse of the first oil input channel 4 along side cover enclosing cover 1 is set, and the upper end of first oil input channel 4 extends to described
The upper surface of side cover enclosing cover 1, the upper end of the first oil input channel 4 are closed by technique plug 12, the lower end connection of first oil input channel 4
First oil-out 5, first oil-out 5 are arranged on the bottom wall 101 of the cavity 10.The second oil duct system includes the
Two oil input channels 6, second oil input channel 6 is circumferentially disposed along the side cover enclosing cover 1, i.e. the second oil input channel 6 is along side cover enclosing cover 1
Short transverse is set, and the lower end of second oil input channel 6 extends to the lower surface of the side cover enclosing cover 1, under the second oil input channel 6
End is closed by technique plug 12, and the upper end of second oil input channel 6 connects the second oil-out 7, and second oil-out 7 is arranged on
On the bottom wall 101 of the cavity 10.
The static pressure support system includes oil road 8 and several throttling roads 9, and the oil road 8 is along the cover bush 2
It is axially arranged, one end of the oil road 8 connects the second oil input channel 6；The one end in the throttling road 9 connects with the oil road 8
Connect, the throttling other end of road 9 is communicated in the side wall of the inner chamber 10, and short transverse of the throttling road 9 along cover bush 2 is vertical
Or it is obliquely installed.Cover bush 2 is included positioned at the upper end of the top of cavity 10 and positioned at the bottom of the lower section of cavity 10, this implementation
In example, the static pressure support system is arranged on the cover bush 2 positioned at the bottom of the lower section of cavity 10.
As shown in Fig. 2 in the plunger pump course of work, outwards axially moved by becoming cavity 10 of the gauge rod 20 along side cover,
Hydraulic oil is sucked from oil inlet 3, the first oil-out 5 connected by the lower end of the first oil input channel 4 is flowed into cavity 10, Ran Houjing
Cross the second oil-out 7 to flow into the second oil input channel 6, hydraulic oil is continued to flow into static pressure support system by the second oil input channel 6, liquid
When force feed flows in static pressure support system, throttling road 9 serves the effect of fixed damping, and hydraulic oil enters from oil road 8 to be saved
After runner 9, the oil pressure in oil road 8 is changed after overdamp, the hydraulic oil after pressure change occurs and is transported to sky
Stable oil film is formd between the side wall and change gauge rod 20 of chamber 10；Inwardly axially moved along side cover cavity 10 when becoming gauge rod 20
When, realize force feed function.When change gauge rod 20 moves reciprocatingly in cavity 10, oil film can avoid side cover cavity 10 and become gauge rod
Contact friction is produced between 20, reduces the abrasion of side cover.
Several balancing slits 11, circumferential cloth of the balancing slit 11 along the cavity 10 are set in the side wall of the cavity 10
Put.When change gauge rod 20 does high-frequency reciprocating motion in cavity 10 under working condition, balancing slit 11 can be made up because mismachining tolerance
Interim card caused by unbalance loading under caused action of hydraulic force.
The end face outside of the side cover enclosing cover 1 sets fabrication hole 13, and one end of the fabrication hole 13 connects with the oil road 8
Connect, the other end of the fabrication hole 13 is closed by technique plug 12.The first oil input channel 4 of technique plug 12 and closing of fabrication hole 13
And second the technique plug 12 of oil input channel 7 be to ensure to keep between each oil duct insertion, stable oil pressure.
The static pressure support side cover also includes seal assembly, and the seal assembly includes seal 14 (15) and is tightly connected
Part 16, the sealed connecting component 16 are connected through a screw thread with the through hole, and sealed connecting component 16 can select the screw thread knot such as stud
Structure part.The seal 14 (15) is arranged on the sealed connecting component 16, and the seal 14 (15) is placed in the concave surface
In 18 and the through hole is closed, sealing ring 17, the sealing are additionally provided between the seal 14 (15) and the concave surface 18
The quantity of part 14 (15) is at least 1, and sealing ring 17 can prevent hydraulic oil from oozing out.By seal 14 (15) and it is tightly connected
Part 16 seals the through hole of side cover enclosing cover 1, can prevent hydraulic oil from being flowed out from side cover.Sealing ring 17 is placed in the outer of side cover enclosing cover 1
It in concave surface 18 on side end face, can prevent sealing ring 17 from moving, facilitate sealing ring 17 to install.
The seal 14 (15) of the present embodiment is 2, including first seal 15 and second seal 14, first seal
15 and second seal 14 successively close to being tightened on sealed connecting component 16,2 seals 14 (15) may insure the jail of sealing
Gu.
Stop screw 19 is also equipped with the side end face of the side cover enclosing cover 1 of the present embodiment, stop screw 19 is to installed in side
The position-limiting action that the other parts covered are axially moved.
The plunger pump static pressure support side cover of the present invention sets oil duct system on side cover enclosing cover 1 and set on cover bush 2
Static pressure support system is put, is connected by oil duct system with static pressure support system, hydraulic oil supports through oil channel system into static pressure
System, make to produce oil lamella in the side wall of side cover cavity 10, avoid directly contacting between change gauge rod 20 and the side wall of cavity 10, prevent
Only there is the life-span that excessive abrasion influences side cover in inner chamber 10.
Embodiment 2
The embodiment only describes the difference with above-described embodiment, and remaining technical characteristic is same as the previously described embodiments.This
The side cover enclosing cover 1 and cover bush 2 of embodiment are split shaping (not shown)s, and the shell of side cover enclosing cover 1 and plunger pump is consolidated
Fixed connection, cover bush 2 is compressed by side cover enclosing cover 1, cover bush 2 is placed in shell, makes side cover enclosing cover 1 and cover bush
2 realize cooperation installation.
Embodiment 3：
The embodiment only describes the difference with above-described embodiment, and remaining technical characteristic is same as the previously described embodiments.This
The static pressure support system of embodiment is arranged on the upper end (not shown) of the cover bush 2.
Embodiment 4：
The embodiment only describes the difference with above-described embodiment, and remaining technical characteristic is same as the previously described embodiments.This
Embodiment is respectively provided with the static pressure support system in the upper and lower end of the cover bush 2 and set (not to be shown in figure
Go out).
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and changed.Therefore, the invention is not limited in embodiment disclosed and described above, to the one of invention
A little modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although used in this specification
Some specific terms, but these terms are merely for convenience of description, do not form any restrictions to invention.
Claims (10)
1. a kind of Novel plunger pump static pressure supports side cover, including side cover enclosing cover and cover bush, the cover bush is outside side cover
The external part that its inner side end of cover rim extends, the cover bush are had time along its axial set between the side cover enclosing cover
Chamber, it is characterised in that the oil duct system that sets is covered outside the side cover, static pressure support system is set on the cover bush, it is described
Oil duct system is connected with the static pressure support system.
A kind of 2. Novel plunger pump static pressure support side cover according to claim 1, it is characterised in that the outer cover rim of the side cover
Its is axially arranged through hole, and the through hole is through the side cover enclosing cover and connects the cavity, with the through hole end thereof contacts
The end face outside of the side cover enclosing cover is provided with concave surface.
A kind of 3. Novel plunger pump static pressure support side cover according to claim 2, it is characterised in that the oil duct system bag
The first oil duct system and the second oil duct system are included, the first oil duct system is arranged on the first half of the side cover enclosing cover, described
Second oil duct system is arranged on the lower half of the side cover enclosing cover.
A kind of 4. Novel plunger pump static pressure support side cover according to claim 3, it is characterised in that the first oil duct system
System includes oil inlet and the first oil input channel, and the oil inlet connects with first oil input channel, and first oil input channel is described in
Side cover enclosing cover it is circumferentially disposed, the upper end of first oil input channel extends to the upper surface of the side cover enclosing cover, and described first enters
The lower end of oil duct connects the first oil-out, and first oil-out is arranged on the bottom wall of the cavity.
A kind of 5. Novel plunger pump static pressure support side cover according to claim 3, it is characterised in that the second oil duct system
System includes the second oil input channel, and second oil input channel is circumferentially disposed along the side cover enclosing cover, the lower end of second oil input channel
The lower surface of the side cover enclosing cover is extended to, the upper end of second oil input channel connects the second oil-out, second oil-out
It is arranged on the bottom wall of the cavity.
A kind of 6. Novel plunger pump static pressure support side cover according to claim 2, it is characterised in that the static pressure support system
System includes oil road and several throttling roads, and the oil road is axially arranged along the cover bush, and the one of the oil road
End connects the oil duct system；The one end in the throttling road is connected with the oil road, and the other end is communicated to the side of the cavity
On wall.
A kind of 7. Novel plunger pump static pressure support side cover according to claim 2, it is characterised in that the static pressure support system
System is arranged on the upper end that the cover bush is located above the cavity；Or the static pressure support system is arranged on the side cover
Bushing is located at the bottom below the cavity；Or the static pressure support system is arranged on the upper end of the cover bush with
End.
A kind of 8. Novel plunger pump static pressure support side cover according to claim 2, it is characterised in that the side wall of the cavity
It is upper setting several balancing slits, the balancing slit along the cavity circumferentially.
9. a kind of Novel plunger pump static pressure support side cover according to claim 6, it is characterised in that the side cover enclosing cover
End face outside sets fabrication hole, and one end of the fabrication hole is connected with the oil road, and the other end of the fabrication hole is by technique
Plug is closed.
A kind of 10. Novel plunger pump static pressure support side cover according to claim 2, it is characterised in that the static pressure support
Side cover also includes seal assembly, and the seal assembly includes seal and sealed connecting component, and the sealed connecting component leads to described
Hole is connected through a screw thread, and the seal is arranged on the sealed connecting component, and the seal is placed in the concave surface and sealed
The through hole is closed, sealing ring is additionally provided between the seal and the concave surface, the quantity of the seal is at least 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711014748.7A CN107642486B (en) | 2017-10-26 | 2017-10-26 | Novel plunger pump static pressure supports side cap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711014748.7A CN107642486B (en) | 2017-10-26 | 2017-10-26 | Novel plunger pump static pressure supports side cap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107642486A true CN107642486A (en) | 2018-01-30 |
| CN107642486B CN107642486B (en) | 2024-03-12 |
Family
ID=61124623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711014748.7A Active CN107642486B (en) | 2017-10-26 | 2017-10-26 | Novel plunger pump static pressure supports side cap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107642486B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6436909A (en) * | 1987-07-13 | 1989-02-07 | Sulzer Ag | Reciprocating internal combustion engine with at least one cylinder liner |
| JPH0783015A (en) * | 1993-09-10 | 1995-03-28 | Mitsubishi Heavy Ind Ltd | Piston linkage type lubricator |
| JPH09166074A (en) * | 1995-12-15 | 1997-06-24 | Toshiba Mach Co Ltd | Sawsh plate lubricating structure of swash plate piston type variable displacement pump |
| CN102242700A (en) * | 2011-06-28 | 2011-11-16 | 张坚 | Novel variable oil pump |
| CN104006023A (en) * | 2014-06-06 | 2014-08-27 | 徐州徐工液压件有限公司 | Clearance seal plunger type cylinder |
| CN204610163U (en) * | 2015-04-23 | 2015-09-02 | 宁波恒力液压股份有限公司 | Double steering constant-pressure variable axial piston pump |
| WO2016058457A1 (en) * | 2014-10-15 | 2016-04-21 | 邢宇 | Bushing for cooling dual-side mechanical seal friction pair and centrifugal pump cooling system thereof |
| CN207333172U (en) * | 2017-10-26 | 2018-05-08 | 佛山市科达液压机械有限公司 | A kind of Novel plunger pump static pressure supports side cover |
-
2017
- 2017-10-26 CN CN201711014748.7A patent/CN107642486B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6436909A (en) * | 1987-07-13 | 1989-02-07 | Sulzer Ag | Reciprocating internal combustion engine with at least one cylinder liner |
| JPH0783015A (en) * | 1993-09-10 | 1995-03-28 | Mitsubishi Heavy Ind Ltd | Piston linkage type lubricator |
| JPH09166074A (en) * | 1995-12-15 | 1997-06-24 | Toshiba Mach Co Ltd | Sawsh plate lubricating structure of swash plate piston type variable displacement pump |
| CN102242700A (en) * | 2011-06-28 | 2011-11-16 | 张坚 | Novel variable oil pump |
| CN104006023A (en) * | 2014-06-06 | 2014-08-27 | 徐州徐工液压件有限公司 | Clearance seal plunger type cylinder |
| WO2016058457A1 (en) * | 2014-10-15 | 2016-04-21 | 邢宇 | Bushing for cooling dual-side mechanical seal friction pair and centrifugal pump cooling system thereof |
| CN204610163U (en) * | 2015-04-23 | 2015-09-02 | 宁波恒力液压股份有限公司 | Double steering constant-pressure variable axial piston pump |
| CN207333172U (en) * | 2017-10-26 | 2018-05-08 | 佛山市科达液压机械有限公司 | A kind of Novel plunger pump static pressure supports side cover |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107642486B (en) | 2024-03-12 |
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