JPS6016513B2 - Swash plate type compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compressor, and in particular to a swash plate type compressor that has recently become widely used for car coolers, and its main purpose is to achieve higher performance than conventional compressors of this type. Our goal is to provide compressors with a long lifespan.

Generally, the swash plate type compressor is as shown in Fig. 1.
A swash plate 5 that is attached to a shaft 4 disposed in the cylinder block 1 and rotates together with the shaft 4, a shoe 6 that slides while contacting the swash plate 5, and a shoe 6 for maintaining the movement of the shoe 6 in a free state. The ball 7 converts the rotational motion of the shaft 4 into the reciprocating motion of the piston 3 moored across the swash plate 5. In this basic structure, the medium to be compressed, such as soot gas, which circulates in the refrigeration circuit and returns to the compressor, is compressed to high pressure in the cylinder bore 2 by the piston 3, and then transferred to a condenser (not shown). A cycle in which the air is sent out, cooled and liquefied there, and then sent to an evaporator where it is evaporated and takes away latent heat of vaporization from the surroundings to cool the indoor air, while the taken heat is released into the air (atmosphere) while passing through the condenser. It is made to repeat. However, when such a tilted compressor is used for a car cooler, the operating conditions are extremely severe.

In other words, the drive source is an internal combustion engine such as gasoline or diesel, and the structure is such that the rotation speed is almost the same as that of the internal combustion engine due to the purpose of making the compressor smaller and lighter and the compressor capacity. . Therefore,
The rotation speed of the swash plate compressor is subject to conditions ranging from about 50 pm, which is the rotational speed of the internal combustion engine during idling, to about 600 pm, such as when driving at high speeds or accelerating suddenly. In addition, although this is not a problem limited to swash plate compressors, in recent years, as cars have become lighter, compressors themselves have been required to be smaller and lighter, and the oil pump inside the compressor has been removed. In order to improve the performance of compressors, the amount of lubricating oil has been reduced, making it easier for friction and wear to occur on the sliding parts within the compressor.

Furthermore, the temperature inside the engine room has increased due to the installation of various devices in the engine room in recent years, such as exhaust gas control devices and devices to reduce fuel consumption.
The negative effects on the lubricating oil inside the compressor cannot be avoided.

In a swash plate type compressor used under these conditions, the part most adversely affected by the above conditions is the interlocking part between the swash plate 5 and shoe 6 shown in FIG. The sliding speed is about 2 to 3 m/sec when the engine is idling, and 20 to 25 h'sec at maximum rotation of about 600 pm, and even during normal driving, they slide at extremely high speeds of about 7 to 15 m/sec. This is because they will be moved. In addition to such high-speed sliding motion, a load acts on the shoe to compress the medium to be compressed, such as cold soot, and the load is approximately 60 to 130 kg'. Although it is rare for such a sliding speed and pressure to have the maximum combination, PV (pressure is Pk9' and speed is Vm')
sec) value often exceeds 2000. Moreover, this is repeated in relation to the rotational speed. The load that the shoe receives from each repetition becomes an impact load, especially at high rotation speeds, and the extremely harsh conditions of receiving such an impact load and sliding at a high distance are required for the sliding contact between the swash plate and the shoe. It happens in some parts. Furthermore, when looking at the sliding condition between the swash plate and the shoes from the lubrication perspective, with the removal of the oil pump as mentioned above, the lubricating oil supplied to the sliding parts is supplied in a slightly gaseous state due to mixing with cold soot gas. It becomes only.

This is because the lubrication of a swash plate type compressor with an oil pump removed is generally carried out by skillfully circulating refrigerant gas containing oil through each moving part within the compressor, but in this case, the amount of oil This is because there is an inversely proportional relationship between air conditioning and cooling capacity, so reducing the amount of oil is an effective means of increasing the cooling capacity of a swash plate compressor. From another perspective, it is the lubrication conditions that have the most influence on the life of the sliding parts of the swash plate and the shoes, and in particular, the amount of lubricating oil has the most influence.
Therefore, in the midst of these contradictory relationships, what is particularly considered when designing a swash plate type compressor is the materials of the swash plate and shoes that can meet the harshest sliding conditions. Furthermore, since the sliding motion between the swash plate and the shoes is a thrust sliding motion in which it is difficult to obtain a sufficient lubrication effect even if sufficient oil is supplied, the sliding surfaces must always be under boundary lubrication. , or there is solid contact there.Also, as a phenomenon that occurs because the swash plate compressor for car cooler performs emergency rotational movement that is necessary for its use, there is a phenomenon in which the sliding surface between the swash plate and the shoe is There is a situation where lubricating oil is not supplied for several tens of seconds or even several minutes after startup, so during this period, the swash plate and shoes are completely lubricated and are not operated in a solid contact situation. Become. This situation occurs when cold soot leaks from the pipes and the amount of lining medium contained in the refrigeration cycle decreases, or when cold soot is returned to the compressor due to the operation of the evaporation pressure regulating device attached to the evaporator. It is also caused when the amount is decreased. Furthermore, in recent years, there has been a growing trend to use it not only as a car cooler but also as an air conditioner, so it is used not only in warm weather but also in cold weather, that is, when the lubricating oil is cold. Lubrication conditions have become even more severe. Therefore, the most common problem with conventional swash plate type combrezzars is the above-mentioned dovetailing that occurs without lubrication from the time of startup, and the wear that occurs without lubrication can become a fatal defect. This caused burn-in. Traditionally, swash plates have been made of structural materials that have mechanical rigidity, fatigue strength, and wear resistance, as materials that can withstand the above-mentioned lubrication conditions, as well as materials that can withstand the high surface pressure and impact loads mentioned above. Alloy steels such as nickel-chromium steel, nickel-molybdenum steel, chromium-molybdenum steel, spheroidal graphite cast iron, malleable wrought iron, and structural carbon steel were used, and the surface layer was hardened.

In addition, materials such as high-carbon chromium steel were also used for the ball, mainly to withstand high loads. Possible shoe materials include Algyl alloy, phosphor bronze, copper-lead-tin sintered alloy, brass, high-strength yellow steel alloy, bronze alloy, aluminum bronze gold, Babbitt metal, oil-impregnated bearing alloy, low Si-Mn bronze, etc. was. However, none of the materials known so far have been able to fully satisfy the above-mentioned extremely severe operating conditions peculiar to swash plate compressors for car coolers.

In view of the above circumstances, the inventors of the present invention have conducted various research and development and have found that the sliding speed is 2 to 28 h/sec.
It can withstand repeated operations and repeated impact loads of 130 to 140k9/cm, and the supply of lubricating oil is extremely small; it is supplied in the form of a gas mixture with cold soot, and there is no lubrication for several seconds to several minutes after startup. The present invention was completed by discovering an excellent alloy material that can sufficiently withstand sliding under various conditions and applying it to shoe materials for swash plate compressors, particularly car coolers. That is, the present invention provides a shoe made of a Yamaichi Sn-based alloy that has excellent seizure resistance and wear resistance even under the above-mentioned severe operating conditions.

In addition, the AI-Sn alloy mentioned above has ductility and is suitable for rolling and rolling, so by using a backing metal, the strength of the shoe can be improved, and by forming the shoe into a sheet and obtaining the shoe by press punching, productivity can be improved. You can improve your
Furthermore, since the material is mainly made of AI material, the cost is lower than that of conventional materials, so it is possible to provide a high-performance shoe at an extremely low cost. N- for forming the shoe of the present invention
The n-based alloy contains 3.5 to 35% sn in wt% and a total amount of 1
．． 0-10% Cr, Si, Mn, Sb, Ti, Zr, N
i, Fe, W, Ce, Nb, V, Mo, Ba, Ca, C
o of the additive group consisting of at least two or more elements containing Cr, and the remainder substantially consisting of AI, in addition to which the total amount is 3% or less of Cu or (and)
Mg, Pb, Bi, T1, Cd, ln with a total amount of 9% or less
, Zn can be added to further improve the performance.

First, considering the Sn content, generally speaking, as the Sn content increases, the conformability and lubricity improve, but the hardness decreases and the load capacity of the shoe decreases; As the Sn content decreases, the load capacity improves, but the alloy becomes too hard as an alloy for shoe materials, resulting in poor conformability and the like.

Conventionally, the upper limit of the Sn content is generally set at about 15% and the lower limit is set at about 3.5%. It is set to . In other words, as mentioned above, the upper limit has conventionally been set at about 15%, and the reason for this is that if more than 15% is added, the Sn particles in the alloy become isolated in the mountains and cannot be dispersed, and begin to exist in a continuous state. However, in the present invention, due to the effects of addition of other elements described later, there is no practical problem even if up to 35% of this is added, so 35% is set as the upper limit. It was set. The amount of Sn added is preferably in the range of 6 to 20%. Additive groups, namely Cr, Si, Mn
, Sb, Ti, Zr, Ni, Fe, VV, Ce, Nb,
Among V, Mo, Ba, Ca, and Co, C is particularly effective in preventing increase in hardness and softening at high temperatures, not causing coarsening of Sn particles even when bran is dulled, and having excellent wear resistance and resistance. The addition effect is high in terms of improving seizability.

This C[ is particularly effective in the range of 0.1 to 1.0% to prevent a decrease in hardness at high temperatures, prevent coarsening of Sn particles, and improve adhesion resistance. Yes, on the other hand
It is believed that a content in the range of 1.0 to 10% is effective in improving wear resistance and competition resistance. First, to increase hardness and prevent softening at high temperatures, if the amount of Cr added is less than 0.1% by weight, good high-temperature hardness cannot be expected, and if it is added more than 1.0%, N-C This makes it impossible for the intermetallic compound to be finely and uniformly dispersed, reducing the effect of the addition.

To explain this improvement in high-temperature hardness in more detail, Cr increases the recrystallization temperature of AI by forming a solid solution in N,
The hardness itself increases the hardness of the mountain, but at the same time, rolling several times also increases the hardness compared to when it was cast. Increasing the recrystallization temperature is effective in maintaining stable mechanical properties even in the high-temperature region to which the shoes of swash plate compressors are exposed. This prevents softening in high temperature ranges, which in turn improves the strength of the shoe. In addition, the Cr intermetallic compound that precipitates past the box solubility limit has a Vickers hardness of 370 or more, and therefore, the dispersion and precipitation of this compound helps maintain high-temperature hardness, so it is dispersed in an appropriate amount. This has a positive effect. Next, the effect of addition of Cr on inhibiting the coarsening of S sores will be described.

The coarsening of Sn particles is a phenomenon that occurs when AI-Sn alloys are exposed to high temperatures, as AI grain boundaries and Sn particles move, but as mentioned above, Cr This precipitate is dispersed in the A1 base metal, so this intermetallic compound is not directly
This is thought to be because it prevents the movement of I grain boundaries and at the same time prevents the growth of AI crystal grains, thereby preventing the movement of Sn particles, that is, the coarsening of Sn particles. This leads to the retention of the Sn particles, which have been refined through repeated rolling and hammering, and provides the various effects described above. Although this phenomenon is observed even when the amount of Sn is small, it has a large effect when the amount of Sn is relatively large (approximately 10% or more), especially at about 15% where Sn begins to exist continuously.
In the above, remarkable effects appear. However, it goes without saying that even if the Sn amount is 10% or less, the above-mentioned effect of adding Cr can be fully exhibited depending on the usage conditions and applications.
Moreover, as mentioned above, the Sn particles are kept fine and the A
The presence of I in the metal is also considered to be effective in preventing the elution phenomenon of Sn particles, which have a low melting point of 23 mm, at high temperatures; The effect of preventing the decline in the temperature is confirmed. and again,
By being able to prevent the elution phenomenon of Sn particles, it is possible to prevent agglomeration caused by this elution and, by extension, to prevent glazing. The above is a description of the effect of inhibiting the coarsening of Sn particles in relation to dawn dullness, but the above effect remains unchanged even when the environment in which this shoe material is used is in a high-temperature state comparable to that of a sintered anchor. reasonable and therefore prevents the decline of high temperature hardness,
It is possible to improve fatigue strength and competition resistance performance.

By the way, Cr is 1. % or more, the effect of the addition in terms of preventing softening at high temperatures and preventing the coarsening of Sn particles will be diminished, but such effects can still be expected to be sufficient compared to the case where Cr is not added.

In addition, especially when 1% or more of Cr is added, the effect of improving wear resistance can be obtained. From the viewpoint of improving the wear resistance of Cr, the amount added is preferably in the range of 1 to 1%. The reason is that the AI-Cr intermetallic compound
The stripes dispersed in the base metal improve wear resistance,
If it is less than 1%, the effect will not be exhibited, and if it is more than 10%, the amount of precipitates will be too large, resulting in poor rolling properties, making it difficult to repeat rolling and rolling, and hindering the miniaturization of Sn particles. As can be understood from the above explanation, when Cr is added in an amount of 1 to 10%, preferably 1 to 4%, wear resistance is improved by preventing softening at high temperatures and coarsening of Sn particles. Although it is possible to improve Cr by 0.1 to 1.
When added at 0%, excellent prevention of softening at high temperatures and Sn
Even if the effect of preventing coarsening of particles can be expected, the improvement in wear resistance cannot be expected much.

Therefore, especially when the amount of Cr added is small, one or more other elements from the above additive group are added in addition to Cr for the purpose of improving wear resistance. .

The total amount of two or more elements in the additive group containing Cr is in the range of 1 to 10%. The reason for this is, similar to the above-mentioned reason, that if it is less than 1%, no improvement in wear resistance can be expected, and if it is more than 10%, there will be too much precipitate.
The more desirable addition amount of these additive groups is 1 to 6%.
is within the range of The forms of precipitates of these additives containing Cr include precipitates consisting of these additive elements alone, precipitates consisting of intermetallic compounds of these additive elements, and precipitates consisting of intermetallic compounds of these additive elements and AI. There are precipitates consisting of intermetallic compounds of these additive elements and intermetallic compounds of the other elements, but no matter which form the precipitates are formed in, they are effective in improving wear resistance.

These precipitates are extremely hard with a Vickers hardness of up to 100, so the wear of the shoe due to friction with the swash plate can be significantly reduced by these precipitates. Dispersion produces positive effects.

As mentioned above, the appropriate amount range means 1.0 to 10%, and within this range, the above precipitates are uniformly dispersed and have the effect of improving wear resistance without adversely affecting conformability and the like. This effect of improving wear resistance is remarkable when the mating material is a swash plate with a hard and rough surface.

In general, the performance of a shoe is greatly affected by the hardness and roughness of the mating material. For example, when a conventional AI-Sn shoe material is used as a mating material for a swash plate made of spheroidal graphite cast iron or malleable cast iron, , properties such as seizure resistance and abrasion resistance are significantly impaired. Spheroidal graphite cast iron and castable iron have recently come to be widely used in place of steel because they can be produced at low cost. When grinding, abrasive burrs with sharp edges are generated around the graphite. If the swash plate and shoe can be slid against each other under such a high load that the surface roughness of the swash plate and shoe are equal to the thickness of the oil film between them,
The softer shoe surface is cut away from the swash plate, and as this situation progresses, the surface of the shoe becomes rougher, leading to competition. However, in the shoe of the present invention, the precipitates generated in the AI ground due to the addition of the additive group described above are harder than the burrs of spheroidal graphite cast iron, etc., so these precipitates cause polishing burrs of spheroidal graphite cast iron, etc. This has the effect of removing the oil and causing the migration and adhesion of these precipitates.As a result, the progress of wear on the shoe surface is suppressed in a relatively short period of time, and a stable oil film is formed. As a result, it is recognized that wear resistance and seizure resistance are particularly improved for swash plates made of spheroidal graphite cast iron or malleable cast iron.

Note that among the elements in the additive group except Cr, the preferred order of addition is Si first, then Mn, Sb, then Zr,
Mo, Fe, Co, then Ni, Ti, Ce, then Nb,
The order is W, V, and finally Ba and Ca.

This is because Si itself has excellent hardness and castability, so it is preferable to select it. The ranking below Si takes into consideration the degree of uniform dispersion of intermetallic compounds with other elements and castability. However, among these rankings, Mo, Fe, and Co are slightly inferior in insect resistance, so
In particular, under usage conditions where corrosion resistance is required, consideration must be given to reducing the amount of these additives or using other elements. Next, in addition to the above composition, Cu or/and Mg can be added in an M% of 3% or less, not including 0.

This Cu or (and) Mg is added for the purpose of minimizing the decrease in hardness at high temperatures, and is particularly preferably in the range of 0.1 to 2. skin t%. If it is less than 0.1%, no significant increase in hardness can be expected, and if it is added more than 3.0%, it will become too hard, inhibiting rolling properties and reducing corrosion resistance.

As for Mg, if it is added in an amount of 3% or more, the hardness improves, but the increase in hardness due to rolling becomes too large, making it impossible to perform sufficient rolling, making it difficult to obtain a fine Sn structure. Furthermore, Mg that was dissolved in AI during anchor racing tends to precipitate, and the excess amount added will precipitate, so it cannot be expected that the solid solution will strengthen the mountains. Here, a more preferable addition ratio is 2.0% or less. Further, the effect of Cu or (and) Mg on hardness is produced by adding it simultaneously with Cr, and an increase in hardness at high temperatures cannot be expected with Cu or (and) Mg alone. That is, Cu
Or (and) when Mg is added to AI, the hardness increases significantly during rolling, and even at the same rolling rate, the increase in hardness is remarkable compared to AI materials with other elements added. When heated until close to midnight, it easily softens and cannot be expected to maintain high temperature hardness. On the other hand, Cr and Cu or (and) Mg
When Cr is added at the same time, the hardness, which is increased during rolling due to the effect of adding Cu or (and) Mg, does not decrease much due to the effect of adding Cr even when the steel is dulled. This hardness is maintained even at high temperatures, making it possible to obtain a shoe that has a higher temperature than conventional shoes, which in turn leads to improved fatigue strength. Note that when Cu and Mg are added at the same time, the total amount thereof is preferably within 3%, of which Cu is preferably within 2%. Furthermore, Pb, Bi, m, Cd, ln,
t% of eggs that do not contain one or more types of Zn in a total amount of 0
In addition to the following, it is possible to particularly improve the properties of n as a lubricating metal.

The effects of Pb, Bi, T1, Cd, ln, and Zn are recognized when they are added together with Cr. In other words, conventional AI
- It is possible to add these elements to Sn-based alloys, and some have done so, but if these additive elements are added alone, they will be alloyed into AI-Sn-based alloys. The disadvantage that the melting point of Sn becomes low cannot be avoided. For this reason, in conventional AI-Sn alloys, Sn easily melts and moves at low temperatures, and as a result, it tends to grow into coarse Sn grains, and when used as a shoe, it partially melts during continuous high-load operation. It may also peel off. On the other hand, as in the present invention, if the Sn grains are made finer by adding Cr and the structure is maintained even at high temperatures, Pb, Bj, T1, Cd''
Even if one or more types of ln and Zn are added, the lubricity of Sn can be improved without causing the above-mentioned adverse effects, and it can also be used for shoes that require high fatigue strength.
In addition to fatigue resistance, it is also possible to improve conformability. Pb, Bi, n which can obtain such an effect
, Cd, ln, Zn, the amount of one or more added is 0.
9% or less, excluding The order of these additions is first Pb, ln, then Bi, Cd, Zn, and finally TI.
The preferred order is This is because Pb and ln flow most easily when pressure is applied, and therefore have excellent slipperiness and conformability. The next Bi, Cd, Zn are the above Pb
, ln, and has a slightly higher melting point. This is because the last m has properties comparable to Pb and ln, but resources are scarce and expensive. Furthermore, Sn and Pb, Bi, m
, Cd, ln, and Zn should preferably be added in a total amount of 35% or less.
One or more of these Pb, Bi, m, Cd, and Zn can be added together with the above-mentioned Cu or (and) Mg. can be improved. The shoe having the above composition can be used by being pressed against a backing steel plate, and after this process, it is phosphorized to increase the adhesive strength.

However, as mentioned above, A in the conventional N-Sn alloy structure
Movement of I grain boundaries and Sn particles occurs, and the Sn particles become coarse, resulting in drawbacks such as a decrease in hardness and melting of Sn particles. In contrast, in the present invention, the N-Cr intermetallic compound precipitates generated from the rolling and hammering processes impede the movement of AI grain boundaries and inhibit the growth of AI crystal grains, so the above-mentioned adverse effects due to inscription occur. Therefore, the adhesive strength between the AI-Sn alloy and the backing steel plate can be increased by increasing the annealing temperature. Furthermore, this also applies when the choux is placed at a temperature comparable to that of a shogun.
This also means that it can contribute to improving fatigue strength by preventing softening. Furthermore, it has been found to be effective in improving wear resistance, and is particularly effective when used in swash plates made of spheroidal graphite cast iron. Here, the most preferable composition range for obtaining the shoe of the present invention is determined by considering all properties such as castability, rollability, adhesion with the backing metal, workability, seizing resistance, abrasion resistance, and sliding properties. Sn7.5-2 in percentage
5%, additive group 1.0-6.0%, Cu, Mg0
．． 1-2.0%, Pb, Bi, T1, Cd, ln, Zn
o. It is 5 to 5.0%.

Also, among these elements, Pb, Bi, n, Cd, ln,
When Zn is not added, it is preferable to increase Sn to 10 to 30%. Furthermore, addition of Cu and Mg can be omitted. Next, the present invention will be explained by examples.

Figure 2 shows samples 1 to 15 according to the present invention and sample 1 for comparison.
6 to 20. Samples 1 to 15 were prepared by melting Yamaichi metal in a glass furnace and then melting Yamaichi Cu master alloy, A
The I-Mg master alloy and each master alloy of N and each additive group are melted according to the target components, and finally Sn, Pb, Bi, m, Cd, ln, and Zn are added, followed by degassing treatment. The sample was then cast into a mold, and then rolled and Akatsuki Anchor (35000) was repeated to make a sample.

Next, this sample is further rolled, and then these alloys and a back metal steel plate are pressure-welded to form a bimetal material, and after being tempered, a spherical concave surface with a part of the ball inscribed in the back metal is formed,
Furthermore, this concave surface is plated with Cu to improve the sliding properties with the ball. Comparative samples 16 to 20 were also produced using the same manufacturing method as the above samples, and the same tests were conducted. FIG. 3 shows the results of a dawning test conducted on each sample shown in FIG. 2 under the following test conditions.

In this dawn test, low viscosity oil was applied to a disk as an opponent, a shoe as a sample was pressed against it, and the time until the race was reached without refueling was then measured. Test conditions (1) Sliding speed constant 18 h/s (2) Load 10k9 constant '3} Lubricating oil SSU70 [41 Mating material Material i Spheroidal graphite cast iron II
S5 to m Pearlite malleable iron Straightness 1 mm or less Roughness (maximum) 0.4 to 0.6 [51 shoes - Straightness 1 French meter or less Roughness (maximum) 0.4 to 0.68 Figure 3 As can be understood from the above, the shoe according to the present invention has superior seizure resistance compared to conventional products, and in particular, samples 6, 7, 9, 11 to 15 according to the present invention have a mating material made of spheroidal graphite cast iron. , S5, pearlitic malleable cast iron both show excellent performance.

Next, FIG. 4 shows the results of a seizure test conducted under the following test conditions using samples 2, 4, 9, and 15 according to the present invention and subordinate samples 17 and 1920, respectively. . This competition test was conducted by actually incorporating each of the above samples into a swash plate compressor and under the most severe conditions. Note that the conditions are the same as those for the mating material and the shoe. Test conditions (1) Compressor Swash plate compressor (total displacement 150cc) Number of revolutions 400 Pm Glue Discharge side gas pressure Pd = 4-5kg/'41 Suction side gas pressure Ps = approximately 15cmHg Operating time
2 unique space {61 Lubricating oil Freezing oil 150c
c'7' Gas amount 100g (approximately 10% of the normal value) FIG. 5 also shows the results of measuring the amount of wear for each sample selected in FIG. 4 under the following test conditions.

In this test, the conditions for the mating material and shoe were the same as the first test conditions. Test conditions 'i' Combrezzar Swash plate type compressor (total displacement 150cc) '21 Number of revolutions 550 Pm '3} Discharge side gas pressure Pd = 20k9/ground {4} Suction side gas pressure Ps = 3k9/me {51} Operation time
40 leg hours [6} Lubricating oil Refrigerator oil 150cc
Gas amount IX9 [8' Operating condition: 29 seconds of operation, 5 seconds of rest As shown in the results in Figures 4 and 5 above, the samples of the present invention had excellent seizure resistance and wear resistance. It is being

Furthermore, FIG. 6 shows samples 2, 4, 9, and 1 according to the present invention described above.
5 and comparative samples 1 & 19 and 20 as representatives, the results of measuring the coefficient of friction under the following test conditions are shown.

In this measurement method, each sample was pressed against a rotating disk made of spheroidal graphite cast iron as a mating material, and the friction coefficient was measured while gradually increasing the pressure load. The straightness and roughness of the disc and shoe in this test were the same as the test conditions described above. Test conditions {1} Sliding speed Low h/sec constant (2' Load 40k9/20 for every 3 females from enemy
k9/Gradually increasing rigidity Lubricating oil SSU70 '4) Lubrication method Felt application Approximately 0.8 cc/min As shown in Figure 6, the sample of the present invention can keep the friction coefficient small even when the load increases. In particular, sample 9 shows excellent results.

As detailed above, the present invention is applicable to a compressor, especially a swash plate type compressor for a car cooler, even if there is very little lubricant oil and the sliding parts of the swash plate and shoes are not sufficiently supplied with oil. Even if this condition occurs, and even if the mating material is spheroidal graphite cast iron or malleable cast iron, which have poor sliding properties, we can use a shoe village made of a specific M-Sn alloy that has low wear and excellent seizure resistance. By using it, we were able to provide a long-life swash plate type compressor that could withstand extremely long use, and in particular, it greatly contributed to improving the performance of compressors for car coolers. It is of great significance.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a swash plate type compressor, Fig. 2 is a metal composition diagram showing the composition of the shoe according to the present invention and a comparative shoe, and Fig. 3 is a diagram showing the results of a test of resistance to dawning. , FIG. 4 is a diagram showing the seizure resistance test results in an actual machine, FIG. 5 is a diagram showing the wear resistance test results in an actual machine, and FIG. 6 is a diagram showing the results of measuring the friction coefficient. 1: cylinder block, 23 cylinder bores, 3: piston, 4: shaft, 5: swash plate, 6: shoe, 7: ball. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A swash plate that is rotated by a rotating shaft within a cylinder block, a shoe joined to both surfaces of the swash plate, and a piston that is moored via a ball on the surface of the shoe. In a swash plate type compressor in which the piston is configured to reciprocate within a cylinder bore in response to rotation of the swash plate, the sew is mixed with 3.5 to 35% S by weight percentage.
n, total amount of 1.0 to 10% Cr, Si, Mn, Sb,
Ti, Zr, Ni, Fe, W, Ce, Nb, V, Mo,
1. A swash plate type compressor comprising an Al-Sn alloy consisting of two or more elements of an additive group consisting of Ba, Ca, and Co, including at least Cr, and the remainder substantially consisting of Al. 2. The swash plate type compressor according to claim 1, wherein a back metal is pressure-welded to the chute. 3. A swash plate rotated by a rotating shaft within a cylinder block, and a chute joined to both surfaces of the swash plate;
In a swash plate compressor having a piston moored via a ball on the surface of the shoe, the piston reciprocating within a cylinder bore in response to rotation of the swash plate, the shoe is expressed as a weight percentage, 3.5-35% Sn, total amount 1.0-10% Cr, Si, Mn, Sb
, Ti, Zr, Ni, Fe, W, Ce, Nb, V, Mo
, Ba, Ca, Co, two or more elements containing at least Cr, with a total amount of 3% or less of C
1. A swash plate type compressor, characterized in that it is made of an Al-Sn alloy consisting essentially of U or (and) Mg, and the remainder being Al. 4. The swash plate type compressor according to claim 3, characterized in that a back metal is pressed into contact with the shoe. 5 a swash plate rotated by a rotating shaft within a cylinder block; a chute joined to both surfaces of the swash plate;
In a swash plate compressor having a piston moored via a ball on the surface of the shoe, the piston reciprocating within a cylinder bore in response to rotation of the swash plate, the shoe is expressed as a weight percentage, 3.5-35% S
n, total amount of 1.0 to 10% Cr, Si, Mn, Sb,
Ti, Zr, Ni, Fe, W, Ce, Nb, V, Mo,
Two or more elements including at least Cr from the additive group consisting of Ba, Ca, and Co, with a total amount of 9% or less Pb
, Bi, Tl, Cdln, and one or more elements of Zn, and the remainder substantially consists of Al-S
A swash plate type compressor characterized by being made of an n-based alloy. 6 In addition to the above-mentioned shu, if the total amount of Cu is 3% or less (
and) The swash plate type compressor according to claim 5, wherein the swash plate type compressor is made of an Al-Sn alloy to which Mg is added. 7. The swash plate type compressor according to claim 5 or 6, characterized in that a back metal is pressed into contact with the shoe.