EP1264986A1 - Swash plate and compressor utilizing the same - Google Patents
Swash plate and compressor utilizing the same Download PDFInfo
- Publication number
- EP1264986A1 EP1264986A1 EP02253874A EP02253874A EP1264986A1 EP 1264986 A1 EP1264986 A1 EP 1264986A1 EP 02253874 A EP02253874 A EP 02253874A EP 02253874 A EP02253874 A EP 02253874A EP 1264986 A1 EP1264986 A1 EP 1264986A1
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- EP
- European Patent Office
- Prior art keywords
- swash plate
- layer
- lubrication layer
- silver
- compressor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B27/1036—Component parts, details, e.g. sealings, lubrication
- F04B27/1054—Actuating elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0418—Noble metals
- F05C2201/0421—Silver
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/12—Coating
Definitions
- the present invention relates to a swash plate for use in an air conditioning apparatus for an automobile, and more particularly, to a swash plate for reciprocating a piston, and to a compressor utilizing the same.
- a compressor used in an air conditioning apparatus for an automobile inhales heat exchange medium evaporated in an evaporator, compresses the inhaled heat exchange medium, and pumps the compressed heat exchange medium, so that a refrigerant can continuously circulate.
- the compressor has a variety of types such as a swash plate type, a scroll type, a rotary type, and a wobble plate type according to the type of driving.
- FIG. 1 shows an example of a swash plate type compressor among the various types of compressors.
- the compressor shown in FIG. 1 there are two separate main bodies 11 and 11', and cylinders 12 and 12' are fixedly installed in the main bodies 11 and 11', respectively.
- a swash plate 14 supported by a rotation shaft 13 is installed between the cylinders 12 and 12'.
- a plurality of pistons 15 where a bridge 15a is formed in the middle and an insertion portion 15b into which the edge of the swash plate 14 is inserted, are installed to be capable of sliding at each of the cylinders 12 and 12'.
- a shoe 16 reducing a frictional force due to contact and enabling smooth movement of the swash plate 14 with respect to the pistons 15, is installed at a contact portion between the swash plate 14 inserted into the insertion portion 15b and the pistons 15.
- Valve units 17 and 17' are installed between both side surfaces of the cylinders 12 and 12' and the inner surfaces of the main bodies 11 and 11', respectively.
- a solid lubrication film is formed by thermal spray coating a surface of a swash plate with Cu based alloy to improve a lubricating performance.
- the coating film formed of Cu based alloy in the thermal spray coating method has a limited bonding effectiveness with respect to a material of the swash plate, and so reliability is lowered.
- the Cu coating film is separated from the swash plate.
- tiny metal powder is accumulated on the surface of the swash plate, particles are separated from the accumulated metal powder causing friction between parts.
- the disclosed solid lubricant is to prevent damage of a metal surface on which a sliding movement occurs.
- the solid lubricant is a lubricant compound including molybdenum disulfide, or a combination of molybdenum disulfide and graphite of 60-80 weight percent, and any of antimony oxide, steel, zinc, or gold particles in 10-30 weight percent as an additive to provide heat stability and prevent oxidation, and any of epoxy-ester resin, acryl resin and urea resin.
- molybdenum disulfide-resin based lubricants are disclosed in U.S. Patent No. 3,051,586, 4,303,537, 3,146,142, and 4,206,060.
- Japanese Patent Publication No. 4-26777 a method of forming a film exhibiting superior anti-heat abrasion and anti-sliding features on titanium or titanium alloy.
- the surface of the material is heated at 500°C in vacuum atmosphere and a chemical activation process is performed to the surface, to thus make the surface of the material porous.
- a compound material such as nickel-phosphorous and silicon-carbide is electroplated on the surface of the material to improve an anti-abrasion feature.
- the thickness of the solid lubrication film which includes a pigment or colouring agent and an organic or non-organic binder. Due to the difficulty in controlling the ratio of the solid lubrication material (the colouring agent also acts as a lubricant) and the binder, and the uneven thickness of part of the film according to the shape of a product, the above-described method is difficult to apply to parts in which precise dimensions are required.
- the lubrication feature deteriorates.
- a pigment which is a lubricant is included much, the solid lubrication film is easily abraded and the life span of the film is curtailed.
- a swash plate which has an improved close contacting force of a plated layer for lubrication on a surface, can prevent being seizured into a shoe due to frictional heat generated at a high temperature and in a high-speed rotation, and has an extended life span.
- a swash plate of a compressor comprising a plate member supported by a rotation shaft and contacting a shoe supported capable of sliding with respect to a piston, for reciprocating the piston, wherein an intermediary layer is formed on the surface of the plate member, and a solid lubrication layer formed of silver or silver alloy in which an adhesive force to the plate member is strengthened by the intermediary layer.
- the intermediary layer is formed of any of copper, nickel, manganese, and cobalt, or an alloy thereof, and that the solid lubrication layer is formed into an alloy layer of silver and at least one of soft metal elements of Sn, In, Pd, Cd, Zn, and Au.
- the solid lubrication layer is compound-plated with a mixture of a solid lubricant and silver, and that the solid lubricant is formed of at least one of molybdenum disulphide, tungsten disulphide, graphite, boron nitride, and Teflon RTM including polytetrafluoroethylene.
- an auxiliary lubrication layer formed of any of Sn, In, Pd, Cd, Zn, and Au, or an alloy thereof is provided. Still more preferably, the auxiliary lubrication layer is formed any of Sn, In, Pd, Cd, Zn, and Au, or an alloy of these elements and silver.
- the thickness of the solid lubrication layer is 2 through 30 ⁇ m and the thickness of the intermediary layer is 0.05 through 3 ⁇ m, and that the surface roughness Ra of the solid lubrication layer is 1.0 ⁇ m or less.
- a compressor using the above swash plate can be provided.
- the present invention comprises an intermediary layer formed at at least one side of a friction surface of a driving portion of the compressor and a solid lubrication layer formed of silver or a silver alloy and having an adhesive force strengthened by the intermediary layer.
- the cylinders 12 and 12' are fixedly installed in the main bodies 11 and 11' of a compressor.
- a swash plate 30 is installed between the cylinders 12 and 12' and supported by the rotation shaft 13.
- the piston 15 is installed in the cylinders 12 and 12' to be capable of sliding.
- the piston 15 includes the bridge 15a formed at the center thereof and the insertion portion 15b into which the edge of the swash plate 30 is inserted is formed.
- the shoe 16 is installed at a contact portion between the swash plate 30 inserted into the insertion portion 15b and the piston 15 to reduce a frictional force due to contact and facilitate smooth movement of the piston 15 by the swash plate 30.
- the swash plate 30 is formed of a plate member 31 installed at the rotation shaft 13. As shown in FIGS. 3 and 4, an intermediary layer 32 is formed on the plate member 31 forming the swash plate 30. A solid lubrication layer 33 is formed on the intermediary layer 32 such that the solid lubrication layer 33 is in close contact with or bonded strongly to the plate member 31 by means of the intermediary layer 32. This provides lubrication for contact with the shoe.
- the intermediary layer 32 is formed of any of copper, nickel, manganese, and cobalt, or an alloy thereof, by electroplating or chemical plating.
- the thickness of the intermediary layer 32 is formed to be between 0.05 ⁇ m and 3.0 ⁇ m.
- the intermediary layer 32 is 0.05 ⁇ m or less thick, the management of thickness cannot be well performed in a plating step.
- the thickness is 3.0 ⁇ m or more, a large amount of intermetallic compounds are subsequently formed with the solid lubrication layer 33 so that the solid lubrication layer 33 is not easily detached under the conditions of a high speed and a high load during the operation of the compressor.
- the material and thickness forming the intermediary layer 32 is however not limited to the above preferred embodiment, and any material and thickness capable of improving a close contact force or bond between the solid lubrication layer 33 and the plate member 31 can be used.
- the solid lubrication layer 33 is formed on the upper surface of the intermediary layer 32 by electroplating or chemical plating using silver or silver alloy. Meanwhile, the solid lubrication layer 33 may be formed of at least one of soft metal elements of Sn, In, Pd, Cd, Zn, and Au, and a silver alloy layer. Also, the solid lubrication layer 33 can be plated with a mixture of a solid lubricant and silver or silver alloy.
- the solid lubricant mixed with silver and silver alloy can be formed of any of molybdenum disulphide, tungsten disulphide, graphite, boron nitride, and Teflon RTM or polytetrafluoroethylene, and a compound thereof.
- the thickness of the solid lubrication layer 33 is formed to be between 2 and 30 ⁇ m and a surface roughness Ra is formed to be 0.1 ⁇ m.
- the solid lubricant and silver can be mixed and plated on the upper surface of the solid lubrication layer 33.
- the solid lubricant can be formed of any of molybdenum disulphide, tungsten disulphide, graphite, boron nitride, and Teflon RTM or polytetrafluoroethylene, and a compound thereof.
- An auxiliary lubrication layer 34 may further be provided on the upper surface of the solid lubrication layer 33 for smooth lubrication with the shoe 16, as shown in FIG. 4.
- the auxiliary lubrication layer 34 is formed of any of Sn, In, Pd, Cd, Zn, and Au, or an alloy thereof, or silver with any of Sn, In, Pd, Cd, Zn, and Au, or an alloy made of these elements and silver.
- the solid lubrication layer 33 and the auxiliary lubrication layer 34 having the above structure are not limited to the above preferred embodiment.
- the intermediary layer 32, the solid lubrication layer 33, and the auxiliary lubrication layer 34 are preferably formed along a trace made on the plate 31 as it contacts the shoe 16 during the rotation of the swash plate 30 for the lubrication with the shoe 16, or alternatively they can be formed on the entire surface of the plate member 31 forming the swash plate 30.
- the intermediary layer, the solid lubrication layer, and the auxiliary lubrication layer can also be applied to a driving portion that frictionally contacts them.
- the intermediary layer, the solid lubrication layer, and the auxiliary lubrication layer can be applied to the frictional contact portion of the cylinder 11 and the piston 12 or the shaft support portion of the rotation shaft 13.
- the swash plate 30 fixedly installed at the rotation shaft 13 rotates as the rotation shaft 13 rotates. Accordingly, the pistons 15 contacting the shoe 16 in frictional contact with the swash plate 30 and supported thereby reciprocate with respect to the cylinders 12 and 12' to compress a heat exchange medium.
- the solid lubrication layer 33 is formed on the plate member 31 forming the swash plate 30 in friction contact with the shoe 16, seizuring of the swash plate 30 and the shoe 16 under irregular driving conditions such as high speed rotation at a high temperature and with a heavy load or quick drive of an automobile, is prevented.
- the surface roughness of the solid lubrication layer 33 is 1.0 mm or less (and most preferably, 0.1 ⁇ m)
- an increase of torque according to friction between the shoe 16 and the solid lubrication layer 33 during high speed rotation of the swash plate 30 is prevented so that an increase of temperature in the compressor 10 is prevented.
- the plate member 31 of the swash plate 30 is manufactured using a steel member to have a diameter of 95 mm and a thickness of 5 mm.
- the surface roughness of the plate member 31 before the solid lubrication layer 33 is added is 0.5 ⁇ m and the surface roughness after the solid lubrication layer 33 is added is measured to be around 0.5 ⁇ m.
- the swash plates in the following test examples are manufactured through the following steps.
- the swash plate according to the present invention is manufactured by sequentially performing a dipping and degreasing step, a water rinsing step, an electrocleaning step, a water rinsing step, an activation process step, a water rinsing step, a neutralization step, a solid lubrication layer forming step using copper, nickel, manganese, and cobalt, a water rinsing step, an solid lubrication layer forming step using silver or silver alloy, a water rinsing step, and a drying step, to the plate member.
- the thickness of the intermediary layer 32 is controlled by adjusting current density and time in the state in which copper cyanide, soda cyanide, and glass soda cyanide are mixed in a predetermined ratio.
- the thickness of the solid lubrication layer 33 is controlled by adjusting current density and time in the state in which potassium silver cyanide, anhydrous potassium cyanide, and potassium carbonate are mixed in a predetermined ratio.
- Thickness of intermediary layer ( ⁇ m) Thickness of solid lubrication layer ( ⁇ m) High speed lubrication test Test example 1 0.05 2 Passed Test example 2 0.05 10 passed Test example 3 0.05 30 passed Test example 4 1.5 2 Passed Test example 5 1.5 10 Passed Test example 6 1.5 30 Passed Test example 7 3.0 2 Passed Test example 8 3.0 10 Passed Test example 9 3.0 30 Passed Comparison example 1 0.01 10 Not passed (A) Comparison example 2 3.5 10 Not passed (B) Comparison example 3 1.5 1 Not passed (B) Comparison example 4 1.5 40 Not passed (A) Comparison example 5 1.5 10 (Ra 1.2) Not passed (B)
- graphs in FIGS. 5, 6, and 7 are obtained by measuring temperature, torque, and pressure applied to the swash plate when the swash plates of test examples 2, 5, and 8 are driven.
- Graphs in FIGS. 8 through 12 are obtained by measuring temperature, torque, and pressure applied to the swash plate when the swash plates of comparison examples 1 through 5 are driven.
- the thickness of the intermediary layer 32 formed of copper, nickel, manganese, and cobalt is set within a range of 0.05 through 3 ⁇ m.
- the thickness of the solid lubrication layer 33 formed of sliver is formed between 2 through 30 ⁇ m, an improved high lubrication feature can be obtained.
- the intermediary layer 32 is formed using copper, nickel, manganese, and cobalt on the plate member 31 forming the swash plate 30.
- the solid lubrication layer 33 is formed of silver alloy on the upper surface of the intermediary layer 32.
- the solid lubrication layer 33 is formed on the upper surface of the intermediary layer 32 using a compound plating layer formed of a mixture of silver alloy and any of molybdenum disulphide, tungsten disulphide, graphite, boron nitride, and Teflon RTM or polytetrafluoroethylene which are solid lubricants, or a compound thereof.
- the test examples 10 and 11 are carried out under the same conditions of Test 1.
- the intermediary layer 32 is formed using copper, nickel, manganese, and cobalt on the plate member 31 forming the swash plate 30.
- the solid lubrication layer 33 is formed using silver on the upper surface of the intermediary layer 32.
- the auxiliary lubrication layer 34 is formed using any of Sn, In, Pb, Cd, Zn, and Au, or an alloy thereof, on the upper surface of the solid lubrication layer 33, so that the swash plate 30 is formed.
- the test examples 12 through 15 are carried out under the same conditions of Test 1. The test results are shown in Table 1-3 and graphs in FIGS. 15 and 16.
- Thickness of intermediary layer ⁇ m
- Thickness of solid lubrication layer ⁇ m
- Thickness of auxiliary lubrication layer ⁇ m
- High speed lubrication test Test example 12 1.5 10 2 (tin) Passed Test example 13
- 1.5 10 2 (silver-lead) Passed Test example 15 1.5 10 2 (silver-graphite) passed
- the swash plate 30 is not seizured into the shoe 16 when it is driven at 6,000 rpm for 30 minutes or more.
- the swash plate of the compressor according to the present invention exhibits an improved lubrication feature at a high temperature and under heavy load while frictionally contacting the shoe and rotating at a high speed and is prevented from being seizured into the shoe. Also, reliability according to driving of the compressor is improved. Further, the lubrication features of the swash plate and the shoe are improved and the life span of the compressor is extended.
- swash plate of the fixed capacity type swash plate compressor is described as a preferred embodiment of the present invention in the above, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
- the present invention can be applied to a swash plate of a variable capacity type compressor, a frictional contact surface of a variety of machine driving apparatuses, and a piston and shoe of a compressor.
Abstract
A swash plate (30) of a compressor (10) comprising
a plate member (31) supported by a rotation shaft (13)
and contacting a shoe (16) supported capable of sliding
with respect to a piston (15), for reciprocating the
piston, wherein an intermediary layer (32) is formed on
the surface of the plate member, and a solid lubrication
layer (33) formed of silver or silver alloy in which an
adhesive force to the plate member is strengthened by
the intermediary layer. Thus, the swash plate of the
compressor according to the present invention exhibits
an improved lubrication feature at a high temperature
and under heavy load while frictionally contacting the
shoe and rotating at a high speed and is prevented from
being seizured into the shoe. Also, reliability
according to driving of the compressor is improved.
Further, the lubrication features of the swash plate and
the shoe are improved and the life span of the
compressor is extended.
Description
The present invention relates to a swash plate for
use in an air conditioning apparatus for an automobile,
and more particularly, to a swash plate for
reciprocating a piston, and to a compressor utilizing
the same.
In general, a compressor used in an air
conditioning apparatus for an automobile inhales heat
exchange medium evaporated in an evaporator, compresses
the inhaled heat exchange medium, and pumps the
compressed heat exchange medium, so that a refrigerant
can continuously circulate. The compressor has a
variety of types such as a swash plate type, a scroll
type, a rotary type, and a wobble plate type according
to the type of driving.
FIG. 1 shows an example of a swash plate type
compressor among the various types of compressors. In
the compressor shown in FIG. 1, there are two separate
main bodies 11 and 11', and cylinders 12 and 12' are
fixedly installed in the main bodies 11 and 11',
respectively. A swash plate 14 supported by a rotation
shaft 13 is installed between the cylinders 12 and 12'.
A plurality of pistons 15 where a bridge 15a is formed
in the middle and an insertion portion 15b into which
the edge of the swash plate 14 is inserted, are
installed to be capable of sliding at each of the
cylinders 12 and 12'. A shoe 16 reducing a frictional
force due to contact and enabling smooth movement of the
swash plate 14 with respect to the pistons 15, is
installed at a contact portion between the swash plate
14 inserted into the insertion portion 15b and the
pistons 15. Valve units 17 and 17' are installed between
both side surfaces of the cylinders 12 and 12' and the
inner surfaces of the main bodies 11 and 11',
respectively.
In the compressor 10 having the above structure, as
the rotation shaft 13 rotates, the swash plate 14 fixed
to the rotation shaft 13 is rotated. Accordingly, the
pistons 15 contacting the shoe 16 which frictionally
contacts the swash plate 14, and supported thereby,
reciprocate with respect to the cylinders 12 and 12' and
compress heat exchange medium.
In the above operation, since the swash plate 14
and the shoe 16 are in frictional contact with one
another and the swash plate 14 rotates in a high speed
in the state of a high temperature and a load applied,
when oil is not sufficiently provided, a lubricating oil
film is discontinued. Thus, the swash plate 14 and shoe
16 directly contacting each other make heat and are
seizured. In particular, when the lubricant filled in
the compressor begins to operate after in a long halt
state, the lubricant in liquid state flows down and
causes many problems in the initial operation.
To solve the above problem, a solid lubrication
film is formed by thermal spray coating a surface of a
swash plate with Cu based alloy to improve a lubricating
performance.
However, the coating film formed of Cu based alloy
in the thermal spray coating method has a limited
bonding effectiveness with respect to a material of the
swash plate, and so reliability is lowered. In
particular, under the operation of the compressor at a
high speed, since the bonding between the swash plate
and the Cu based coating film is insufficient, the Cu
coating film is separated from the swash plate. In the
case of the thermal spray coating method, since tiny
metal powder is accumulated on the surface of the swash
plate, particles are separated from the accumulated
metal powder causing friction between parts.
Another example of a solid lubricant is disclosed
in U.S. Patent No. 4,473,481. The disclosed solid
lubricant is to prevent damage of a metal surface on
which a sliding movement occurs. The solid lubricant is
a lubricant compound including molybdenum disulfide, or
a combination of molybdenum disulfide and graphite of
60-80 weight percent, and any of antimony oxide, steel,
zinc, or gold particles in 10-30 weight percent as an
additive to provide heat stability and prevent
oxidation, and any of epoxy-ester resin, acryl resin and
urea resin.
Other molybdenum disulfide-resin based lubricants
are disclosed in U.S. Patent No. 3,051,586, 4,303,537,
3,146,142, and 4,206,060.
In Japanese Patent Publication No. 4-26777, a
method of forming a film exhibiting superior anti-heat
abrasion and anti-sliding features on titanium or
titanium alloy, is shown. According to the above
publication, before a solid lubrication film is coated
on a surface of a material, as a pre-treatment process,
the surface of the material is heated at 500°C in vacuum
atmosphere and a chemical activation process is
performed to the surface, to thus make the surface of
the material porous. Then, a compound material such as
nickel-phosphorous and silicon-carbide is electroplated
on the surface of the material to improve an anti-abrasion
feature.
However, it is difficult to control the thickness
of the solid lubrication film which includes a pigment
or colouring agent and an organic or non-organic binder.
Due to the difficulty in controlling the ratio of the
solid lubrication material (the colouring agent also
acts as a lubricant) and the binder, and the uneven
thickness of part of the film according to the shape of
a product, the above-described method is difficult to
apply to parts in which precise dimensions are required.
When the solid lubrication film contains a large
amount of resin, the lubrication feature deteriorates.
When a pigment which is a lubricant is included much,
the solid lubrication film is easily abraded and the
life span of the film is curtailed.
To solve the above-described problems, it is an
object of the present invention to provide a swash plate
which has an improved close contacting force of a plated
layer for lubrication on a surface, can prevent being
seizured into a shoe due to frictional heat generated at
a high temperature and in a high-speed rotation, and has
an extended life span.
To achieve the above object, there is provided a
swash plate of a compressor comprising a plate member
supported by a rotation shaft and contacting a shoe
supported capable of sliding with respect to a piston,
for reciprocating the piston, wherein an intermediary
layer is formed on the surface of the plate member, and
a solid lubrication layer formed of silver or silver
alloy in which an adhesive force to the plate member is
strengthened by the intermediary layer.
It is preferred in the present invention that the
intermediary layer is formed of any of copper, nickel,
manganese, and cobalt, or an alloy thereof, and that the
solid lubrication layer is formed into an alloy layer of
silver and at least one of soft metal elements of Sn,
In, Pd, Cd, Zn, and Au.
It is preferred in the present invention that the
solid lubrication layer is compound-plated with a
mixture of a solid lubricant and silver, and that the
solid lubricant is formed of at least one of molybdenum
disulphide, tungsten disulphide, graphite, boron
nitride, and TeflonRTM including polytetrafluoroethylene.
It is preferred in the present invention that an
auxiliary lubrication layer formed of any of Sn, In, Pd,
Cd, Zn, and Au, or an alloy thereof is provided. Still
more preferably, the auxiliary lubrication layer is
formed any of Sn, In, Pd, Cd, Zn, and Au, or an alloy of
these elements and silver.
It is preferred in the present invention that the
thickness of the solid lubrication layer is 2 through 30
µm and the thickness of the intermediary layer is 0.05
through 3 µm, and that the surface roughness Ra of the
solid lubrication layer is 1.0 µm or less.
To achieve the above object, a compressor using the
above swash plate can be provided.
Alternatively, the present invention comprises an
intermediary layer formed at at least one side of a
friction surface of a driving portion of the compressor
and a solid lubrication layer formed of silver or a
silver alloy and having an adhesive force strengthened
by the intermediary layer.
Preferred embodiments of the invention will now be
described by way of example only and with reference to
the accompanying drawings in which:
Referring to FIGS. 1 and 2, the cylinders 12 and 12'
are fixedly installed in the main bodies 11 and 11' of a
compressor. A swash plate 30 is installed between the
cylinders 12 and 12' and supported by the rotation shaft
13. The piston 15 is installed in the cylinders 12 and
12' to be capable of sliding. The piston 15 includes the
bridge 15a formed at the center thereof and the
insertion portion 15b into which the edge of the swash
plate 30 is inserted is formed. The shoe 16 is
installed at a contact portion between the swash plate
30 inserted into the insertion portion 15b and the
piston 15 to reduce a frictional force due to contact
and facilitate smooth movement of the piston 15 by the
swash plate 30.
The swash plate 30 is formed of a plate member 31
installed at the rotation shaft 13. As shown in FIGS. 3
and 4, an intermediary layer 32 is formed on the plate
member 31 forming the swash plate 30. A solid
lubrication layer 33 is formed on the intermediary layer
32 such that the solid lubrication layer 33 is in close
contact with or bonded strongly to the plate member 31
by means of the intermediary layer 32. This provides
lubrication for contact with the shoe.
The intermediary layer 32 is formed of any of
copper, nickel, manganese, and cobalt, or an alloy
thereof, by electroplating or chemical plating.
Preferably, the thickness of the intermediary layer 32
is formed to be between 0.05 µm and 3.0 µm. When the
intermediary layer 32 is 0.05 µm or less thick, the
management of thickness cannot be well performed in a
plating step. When the thickness is 3.0 µm or more, a
large amount of intermetallic compounds are subsequently
formed with the solid lubrication layer 33 so that the
solid lubrication layer 33 is not easily detached under
the conditions of a high speed and a high load during
the operation of the compressor.
The material and thickness forming the intermediary
layer 32 is however not limited to the above preferred
embodiment, and any material and thickness capable of
improving a close contact force or bond between the
solid lubrication layer 33 and the plate member 31 can
be used.
The solid lubrication layer 33 is formed on the
upper surface of the intermediary layer 32 by
electroplating or chemical plating using silver or
silver alloy. Meanwhile, the solid lubrication layer 33
may be formed of at least one of soft metal elements of
Sn, In, Pd, Cd, Zn, and Au, and a silver alloy layer.
Also, the solid lubrication layer 33 can be plated with
a mixture of a solid lubricant and silver or silver
alloy.
The solid lubricant mixed with silver and silver
alloy can be formed of any of molybdenum disulphide,
tungsten disulphide, graphite, boron nitride, and
TeflonRTM or polytetrafluoroethylene, and a compound
thereof. Preferably, the thickness of the solid
lubrication layer 33 is formed to be between 2 and 30 µm
and a surface roughness Ra is formed to be 0.1 µm.
The solid lubricant and silver can be mixed and
plated on the upper surface of the solid lubrication
layer 33. Here, the solid lubricant can be formed of
any of molybdenum disulphide, tungsten disulphide,
graphite, boron nitride, and TeflonRTM or polytetrafluoroethylene,
and a compound thereof.
An auxiliary lubrication layer 34 may further be
provided on the upper surface of the solid lubrication
layer 33 for smooth lubrication with the shoe 16, as
shown in FIG. 4. The auxiliary lubrication layer 34 is
formed of any of Sn, In, Pd, Cd, Zn, and Au, or an alloy
thereof, or silver with any of Sn, In, Pd, Cd, Zn, and
Au, or an alloy made of these elements and silver.
The solid lubrication layer 33 and the auxiliary
lubrication layer 34 having the above structure are not
limited to the above preferred embodiment. The
intermediary layer 32, the solid lubrication layer 33,
and the auxiliary lubrication layer 34 are preferably
formed along a trace made on the plate 31 as it contacts
the shoe 16 during the rotation of the swash plate 30
for the lubrication with the shoe 16, or alternatively
they can be formed on the entire surface of the plate
member 31 forming the swash plate 30.
Meanwhile, in the compressor, the intermediary
layer, the solid lubrication layer, and the auxiliary
lubrication layer can also be applied to a driving
portion that frictionally contacts them. For example,
as shown in FIG. 1, the intermediary layer, the solid
lubrication layer, and the auxiliary lubrication layer
can be applied to the frictional contact portion of the
cylinder 11 and the piston 12 or the shaft support
portion of the rotation shaft 13.
The operation of the swash plate is described in
relation to the operation of the compressor of an air
conditioning apparatus according to the present
invention.
In the compressor 10 according to the present
invention, the swash plate 30 fixedly installed at the
rotation shaft 13 rotates as the rotation shaft 13
rotates. Accordingly, the pistons 15 contacting the
shoe 16 in frictional contact with the swash plate 30
and supported thereby reciprocate with respect to the
cylinders 12 and 12' to compress a heat exchange medium.
In the above operation, since the solid lubrication
layer 33 is formed on the plate member 31 forming the
swash plate 30 in friction contact with the shoe 16,
seizuring of the swash plate 30 and the shoe 16 under
irregular driving conditions such as high speed rotation
at a high temperature and with a heavy load or quick
drive of an automobile, is prevented. In particular,
since the surface roughness of the solid lubrication
layer 33 is 1.0 mm or less (and most preferably, 0.1
µm), an increase of torque according to friction between
the shoe 16 and the solid lubrication layer 33 during
high speed rotation of the swash plate 30 is prevented
so that an increase of temperature in the compressor 10
is prevented.
The above-described operations will be more clear
by the following tests performed by the present
inventors.
In each of test examples of Test 1, the plate
member 31 of the swash plate 30 is manufactured using a
steel member to have a diameter of 95 mm and a thickness
of 5 mm. Here, the surface roughness of the plate
member 31 before the solid lubrication layer 33 is added
is 0.5 µm and the surface roughness after the solid
lubrication layer 33 is added is measured to be around
0.5 µm. The swash plates in the following test examples
are manufactured through the following steps.
First, the swash plate according to the present
invention is manufactured by sequentially performing a
dipping and degreasing step, a water rinsing step, an
electrocleaning step, a water rinsing step, an
activation process step, a water rinsing step, a
neutralization step, a solid lubrication layer forming
step using copper, nickel, manganese, and cobalt, a
water rinsing step, an solid lubrication layer forming
step using silver or silver alloy, a water rinsing step,
and a drying step, to the plate member. In the case of
plating to form the intermediary layer 32 among the
above steps, the thickness of the intermediary layer 32
is controlled by adjusting current density and time in
the state in which copper cyanide, soda cyanide, and
glass soda cyanide are mixed in a predetermined ratio.
In the step of forming the solid lubrication layer 33,
the thickness of the solid lubrication layer 33 is
controlled by adjusting current density and time in the
state in which potassium silver cyanide, anhydrous
potassium cyanide, and potassium carbonate are mixed in
a predetermined ratio.
In the state in which the swash plate 30
manufactured in the above-described method is rotated at
a speed of 6,000 rpm and the shoe 16 receives a pressure
of a load of 250 kgf, time, a change in temperature, and
a change in torque are measured and test examples 1
through 9 and comparison examples 1 through 5 are
obtained and the results thereof is shown in Table 1-1.
Thickness of intermediary layer (µm) | Thickness of solid lubrication layer (µm) | High speed lubrication test | |
Test example 1 | 0.05 | 2 | Passed |
Test example 2 | 0.05 | 10 | passed |
Test example 3 | 0.05 | 30 | passed |
Test example 4 | 1.5 | 2 | Passed |
Test example 5 | 1.5 | 10 | Passed |
Test example 6 | 1.5 | 30 | Passed |
Test example 7 | 3.0 | 2 | Passed |
Test example 8 | 3.0 | 10 | Passed |
Test example 9 | 3.0 | 30 | Passed |
Comparison example 1 | 0.01 | 10 | Not passed (A) |
Comparison example 2 | 3.5 | 10 | Not passed (B) |
Comparison example 3 | 1.5 | 1 | Not passed (B) |
Comparison example 4 | 1.5 | 40 | Not passed (A) |
Comparison example 5 | 1.5 | 10 (Ra 1.2) | Not passed (B) |
In the above table, "Passed" means that the
compressor is driven over 30 minutes at 6,000 rpm, "Not
passed (A)" means that the swash plate and shoe are
seizured before the compressor is driven for 30 minutes
at 6,000 rpm, and "Not passed (B)" means that the swash
plate and shoe are seizured before the compressor
reaches 6,000 rpm.
In detail, graphs in FIGS. 5, 6, and 7 are obtained
by measuring temperature, torque, and pressure applied
to the swash plate when the swash plates of test
examples 2, 5, and 8 are driven. Graphs in FIGS. 8
through 12 are obtained by measuring temperature,
torque, and pressure applied to the swash plate when the
swash plates of comparison examples 1 through 5 are
driven.
As can be seen from Table 1-1 and the drawings, the
thickness of the intermediary layer 32 formed of copper,
nickel, manganese, and cobalt is set within a range of
0.05 through 3 µm. When the thickness of the solid
lubrication layer 33 formed of sliver is formed between
2 through 30 µm, an improved high lubrication feature
can be obtained.
In Test 2 of the present invention, the
intermediary layer 32 is formed using copper, nickel,
manganese, and cobalt on the plate member 31 forming the
swash plate 30. In Test example 10, the solid
lubrication layer 33 is formed of silver alloy on the
upper surface of the intermediary layer 32. In Test
example 11, the solid lubrication layer 33 is formed on
the upper surface of the intermediary layer 32 using a
compound plating layer formed of a mixture of silver
alloy and any of molybdenum disulphide, tungsten
disulphide, graphite, boron nitride, and TeflonRTM or
polytetrafluoroethylene which are solid lubricants, or a
compound thereof. The test examples 10 and 11 are
carried out under the same conditions of Test 1. The
test results are shown in Table 1-2 and graphs in FIGS.
13 and 14.
Thickness of intermediary layer (µm) | Thickness of solid lubrication layer using silver alloy (µm) | Thickness of compound plating layer (µm) | High speed lubrication test | |
Test example 10 | 1.5 | 10 | - | Passed |
Test example 11 | 1.5 | - | 10 | passed |
As shown in the graphs and Table 1-2, a
satisfactory lubrication feature can be maintained for
30 minutes or more at 6,000 rpm.
In the present test, the intermediary layer 32 is
formed using copper, nickel, manganese, and cobalt on
the plate member 31 forming the swash plate 30. The
solid lubrication layer 33 is formed using silver on the
upper surface of the intermediary layer 32. The
auxiliary lubrication layer 34 is formed using any of
Sn, In, Pb, Cd, Zn, and Au, or an alloy thereof, on the
upper surface of the solid lubrication layer 33, so that
the swash plate 30 is formed. The test examples 12
through 15 are carried out under the same conditions of
Test 1. The test results are shown in Table 1-3 and
graphs in FIGS. 15 and 16.
Thickness of intermediary layer (µm) | Thickness of solid lubrication layer (µm) | Thickness of auxiliary lubrication layer (µm) | High speed lubrication test | |
Test example 12 | 1.5 | 10 | 2 (tin) | Passed |
Test example 13 | 1.5 | 10 | 2 (lead) | Passed |
Test example 14 | 1.5 | 10 | 2 (silver-lead) | Passed |
Test example 15 | 1.5 | 10 | 2 (silver-graphite) | passed |
As shown in Table 1-3 and graphs in FIGS. 15 and
16, since the auxiliary lubrication layer 34 is formed
on the upper surface of the solid lubrication layer 33,
the swash plate 30 is not seizured into the shoe 16 when
it is driven at 6,000 rpm for 30 minutes or more.
As described above, the swash plate of the
compressor according to the present invention exhibits
an improved lubrication feature at a high temperature
and under heavy load while frictionally contacting the
shoe and rotating at a high speed and is prevented from
being seizured into the shoe. Also, reliability
according to driving of the compressor is improved.
Further, the lubrication features of the swash plate and
the shoe are improved and the life span of the
compressor is extended.
While the swash plate of the fixed capacity type
swash plate compressor is described as a preferred
embodiment of the present invention in the above, it
will be understood by those skilled in the art that
various changes in form and details may be made therein
without departing from the scope of the invention as
defined by the appended claims. For example, the
present invention can be applied to a swash plate of a
variable capacity type compressor, a frictional contact
surface of a variety of machine driving apparatuses, and
a piston and shoe of a compressor.
Claims (16)
- A swash plate (30) of a compressor (10) comprising a plate member (31) adapted to be supported by a rotation shaft (13) and for contacting a shoe (16) supported to be capable of sliding with respect to a piston, for reciprocating the piston (15), wherein an intermediary layer (32) is formed on the surface of the plate member, and a solid lubrication layer (33) comprising silver or silver alloy is formed on said intermediary layer such that the bonding of said solid lubrication layer to the plate member is strengthened by the intermediary layer.
- A swash plate (30) as claimed in claim 1, wherein the intermediary layer (32) is formed of any of copper, nickel, manganese, and cobalt, or an alloy thereof.
- A swash plate (30) as claimed in claim 1 or 2, wherein the solid lubrication layer (33) is formed of an alloy of silver and at least one of tin, indium, palladium, cadmium, zinc and gold.
- A swash plate (30) as claimed in claim 1 or claim 3, wherein the solid lubrication layer (33) is compound-plated with a mixture of a solid lubricant and silver.
- A swash plate (30) as claimed in claim 4, wherein the solid lubricant comprises at least one of molybdenum disulphide, tungsten disulphide, graphite, boron nitride, and TeflonRTM or polytetrafluoroethylene.
- A swash plate (30) as claimed in any of claims 1 to 3, wherein an auxiliary lubrication layer (34) is formed on the upper surface of the solid lubrication layer (33).
- A swash plate (30) as claimed in claim 6, wherein the auxiliary lubrication layer (34) comprises any of tin, indium, palladium, cadmium, zinc and gold, or an alloy thereof.
- A swash plate (30) as claimed in claim 6, wherein the auxiliary lubrication layer (34) comprises any of tin, indium, palladium, cadmium, zinc and gold, or an alloy of these elements and silver.
- A swash plate (30) as claimed in claim 6, wherein the upper surface of the solid lubrication layer (33) is compound-plated with a mixture of solid lubricant and silver.
- A swash plate (30) as claimed in claim 9, wherein the solid lubricant comprises at least one of molybdenum disulphide, tungsten disulphide, graphite, boron nitride, and TeflonRTM or polytetrafluoroethylene.
- A swash plate (30) as claimed in any preceding claim, wherein the thickness of the solid lubrication layer (33) is between 2 µm and 30 µm.
- A swash plate (30) as claimed in any preceding claim, wherein the thickness of the intermediary layer (32) is between 0.05 µm and 3 µm.
- A swash plate (30) as claimed in any preceding claim, wherein the surface roughness Ra of the solid lubrication layer (33) is 1.0 µm or less.
- A swash plate (30) as claimed in any preceding claim, wherein the intermediary layer (32) and the solid lubrication layer (33) are formed along a trace made as the swash plate contacts the shoe (16).
- A compressor (10) using a swash plate (30) as claimed in any of claims 1 to 3, 5, and 7 to 14.
- A compressor (10) comprising:an intermediary layer (32) formed at at least one side of a friction surface of a driving portion of the compressor; anda solid lubrication layer (33) comprising silver or a silver alloy formed on said intermediary layer and having an adhesive force strengthened by the intermediary layer.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020010031120A KR20020092483A (en) | 2001-06-04 | 2001-06-04 | Swash plate and compressor utilizing the same |
KR2001031120 | 2001-06-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1264986A1 true EP1264986A1 (en) | 2002-12-11 |
Family
ID=19710356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02253874A Withdrawn EP1264986A1 (en) | 2001-06-04 | 2002-05-31 | Swash plate and compressor utilizing the same |
Country Status (4)
Country | Link |
---|---|
US (1) | US20020189437A1 (en) |
EP (1) | EP1264986A1 (en) |
JP (1) | JP2003083242A (en) |
KR (1) | KR20020092483A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9708692B2 (en) | 2008-04-07 | 2017-07-18 | Miba Gleitlager Austria Gmbh | Sliding bearing |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100539399B1 (en) * | 2004-01-20 | 2005-12-27 | (유)해송피앤씨 | Method of Surface Finishing of the Swash Plate |
JP4495054B2 (en) * | 2005-09-02 | 2010-06-30 | 三菱重工業株式会社 | Rotary machine parts and rotary machines |
JP5019591B2 (en) * | 2007-03-29 | 2012-09-05 | 古河電気工業株式会社 | Plating material having lubricating particles, method for producing the same, and electric / electronic component using the same |
CN101722818A (en) * | 2008-10-20 | 2010-06-09 | 法雷奥企业管理(北京)有限公司上海分公司 | Air conditioning system of automobile |
JP2011017269A (en) * | 2009-07-08 | 2011-01-27 | Valeo Thermal Systems Japan Corp | Swash plate-type compressor |
US9758382B1 (en) * | 2011-01-31 | 2017-09-12 | Hrl Laboratories, Llc | Three-dimensional ordered diamond cellular structures and method of making the same |
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US4293171A (en) * | 1978-10-25 | 1981-10-06 | Koyo Seiko Company Limited | Anti-friction bearing |
EP0325108A2 (en) * | 1988-01-20 | 1989-07-26 | White Engineering Corporation | Material-working tools and method for lubricating |
JPH0617820A (en) * | 1992-07-06 | 1994-01-25 | Nissan Motor Co Ltd | Slide member |
JPH09257045A (en) * | 1996-03-22 | 1997-09-30 | Nippon Seiko Kk | Needle bearing |
DE19723476A1 (en) * | 1996-06-05 | 1998-01-22 | Atlas Copco Comtec Inc | Compressor housing with interior spark-suppressing coating |
EP1036938A2 (en) * | 1999-03-17 | 2000-09-20 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Compressor coating |
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US3051586A (en) * | 1958-01-27 | 1962-08-28 | Electrofilm Inc | Solid lubricant film resistant to corrosion |
US3146142A (en) * | 1960-06-07 | 1964-08-25 | Union Oil Co | Joint adhesives |
US4206060A (en) * | 1978-10-23 | 1980-06-03 | Sumitomo Kinzoku Kogyo Kabushiki Kaisha | Bolt and nut unit coated with lubricant |
DE2849617A1 (en) * | 1978-11-15 | 1980-05-29 | Dow Corning Gmbh | AQUEOUS LUBRICANT |
US4473481A (en) * | 1982-04-14 | 1984-09-25 | Kabushiki Kaisha Kobe Seiko Sho | Lubricant film for preventing galling of sliding metal surfaces |
EP0713972B2 (en) * | 1994-03-16 | 2007-12-12 | Taiho Kogyo Co., Ltd. | Swash plate for a swash plate type compressor |
JP4023872B2 (en) * | 1997-06-26 | 2007-12-19 | 大豊工業株式会社 | Swash plate compressor swash plate |
-
2001
- 2001-06-04 KR KR1020010031120A patent/KR20020092483A/en not_active Application Discontinuation
-
2002
- 2002-05-29 JP JP2002156417A patent/JP2003083242A/en active Pending
- 2002-05-31 EP EP02253874A patent/EP1264986A1/en not_active Withdrawn
- 2002-06-03 US US10/159,022 patent/US20020189437A1/en not_active Abandoned
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US4293171A (en) * | 1978-10-25 | 1981-10-06 | Koyo Seiko Company Limited | Anti-friction bearing |
EP0325108A2 (en) * | 1988-01-20 | 1989-07-26 | White Engineering Corporation | Material-working tools and method for lubricating |
JPH0617820A (en) * | 1992-07-06 | 1994-01-25 | Nissan Motor Co Ltd | Slide member |
JPH09257045A (en) * | 1996-03-22 | 1997-09-30 | Nippon Seiko Kk | Needle bearing |
DE19723476A1 (en) * | 1996-06-05 | 1998-01-22 | Atlas Copco Comtec Inc | Compressor housing with interior spark-suppressing coating |
EP1036938A2 (en) * | 1999-03-17 | 2000-09-20 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Compressor coating |
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PATENT ABSTRACTS OF JAPAN vol. 1998, no. 01 30 January 1998 (1998-01-30) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9708692B2 (en) | 2008-04-07 | 2017-07-18 | Miba Gleitlager Austria Gmbh | Sliding bearing |
Also Published As
Publication number | Publication date |
---|---|
JP2003083242A (en) | 2003-03-19 |
KR20020092483A (en) | 2002-12-12 |
US20020189437A1 (en) | 2002-12-19 |
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