JP2002174169A - Aluminium shoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminium shoe furnished with an excellent sliding property and durability. SOLUTION: The shoe 76 of a compressor is furnished with a parent material 146 made of a material with aluminium as a main component, hard layers 150, 152 formed on the parent material 146 and an antifriction layer 154 formed on the hard layer 152. The hard layers 150, 152 are the layers of metal of more than 300 Vickers hardness HV. The antifriction layer 154 is a layer of synthetic resin containing a solid lubricant 158. Durability is improved as the parent material 146 is covered with the hard layers 150, 152 harder than the parent material 146, and the sliding property is also improved by making the antifriction layer 154 into the synthetic resin layer containing the solid lubricant 158. It is possible to prevent seizure of the parent material 146 with a piston and a swash plate as only the hard layer 152 is exposed even when the antifriction layer 154 locally disappears. It is possible to increase sticking tendency of the antifriction layer 154 with the parent material 146 by interposing the hard layers 150, 152 between the antifriction layer 154 and the parent material 146.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe disposed between a swash plate and a piston of a swash plate type compressor, and more particularly to a shoe made of a material containing aluminum as a main component and having a generally spherical crown shape. It is related to the eggplant aluminum shoe.

[0002]

2. Description of the Related Art A swash plate compressor converts the rotation of a swash plate into a reciprocating motion of a piston to compress a gas. For this purpose, a shoe is provided between the swash plate and the piston.
This shoe is generally referred to as a hemispherical shoe because the side engaging with the piston is substantially spherical and the side engaging with the swash plate is substantially flat, but it is not necessarily strictly spherical or flat. Instead, the shape is often slightly deviated from a spherical surface or a flat surface for the purpose of improving sliding performance and the like. In general, a variable displacement compressor is smaller than a hemisphere, and a fixed displacement compressor is generally larger than a hemisphere. In a variable displacement compressor, it is necessary that the spherical surfaces of a pair of shoes disposed on both sides of the swash plate are located substantially on one spherical surface, and therefore, are smaller than a hemisphere by half the thickness of the swash plate. Is done. Further, in the fixed displacement compressor, since there is no such limitation, even if the flat portion of the shoe is worn, the size of the sliding surface is made slightly larger than a hemisphere, for example, in order to prevent the area of the sliding surface from decreasing. Often. Therefore, these are not strictly speaking hemispherical shoes, and in this specification, both types of shoes are collectively referred to as spherical crown shoes.

[0003] Further, the shoe is made of a material (aluminum or aluminum alloy) containing aluminum as a main component for the purpose of mass reduction or the like.
42180 and the like. The shoe made of a material containing aluminum as a main component is hereinafter referred to as an aluminum shoe, but the swash plate and the piston are often also an aluminum swash plate and an aluminum piston. Then, when members made of a material mainly composed of the same material are slid with each other, it is proposed that at least one of the sliding surfaces is covered with a layer made of a material other than aluminum, because seizure is likely to occur. ing. The present applicant has also disclosed in
No. 205442 proposes to form a plating layer mainly composed of tin on the surface of an aluminum shoe and further form a coating layer mainly composed of a solid lubricant such as molybdenum disulfide or graphite on the surface of the aluminum shoe. .

[0004]

As described above, an aluminum shoe formed with a plating layer mainly composed of tin and a coating layer mainly composed of a solid lubricant has excellent sliding properties. It shows the properties, for example, the reduction of sliding resistance and the prevention of seizure, but it has been revealed by subsequent research that durability may be insufficient. Therefore, the present invention has been made with an object to obtain a spherical crown-shaped aluminum shoe excellent in both slidability and durability. According to the present invention, the following aluminum shoes can be obtained. As in the case of the claims, each aspect is divided into sections, each section is numbered, and if necessary, is described in a form in which the numbers of other sections are cited. This is for the purpose of facilitating the understanding of the present invention and should not be construed as limiting the technical features and combinations thereof described in the present specification to those described in the following sections. . Further, when a plurality of items are described in one section, the plurality of items need not always be adopted together. It is also possible to select and adopt only some of the items.

(1) An aluminum shoe generally made of a material containing aluminum as a main component and having a generally spherical surface portion and a generally flat surface portion, and having a generally spherical crown shape. Vickers hardness H on flat surface
_V: forming a metal hard layer of 300 or more, and forming an anti-friction layer, which is a layer of a synthetic resin containing a solid lubricant, on the outer side of at least one of the spherical and flat metal hard layers. An aluminum shoe (Claim 1). Materials containing aluminum as a main component generally have low hardness and are easily deformed, so that it is difficult to maintain the shape of the sliding surface, which leads to a decrease in durability. Maintenance becomes easy and durability can be improved. In addition, if a metal layer is formed on the spherical portion and the flat portion of the aluminum shoe, and the antifriction layer is formed on the metal layer, the antifriction layer is formed directly on the surface of the base material of the aluminum shoe. Compared with the case, the adhesion strength of the anti-friction layer to the base material is improved, and peeling of the anti-friction layer is better avoided. Moreover, the metal layer, if the Vickers hardness H _V 300 above hard layer is also improved wear resistance. The reason is presumed as follows. The lubricating layer may be partially removed due to a temporary lack of lubricating oil or an increase in surface pressure, and the hard metal layer may be exposed. Since it does not wear, wear of the spherical portion and the flat portion is avoided. If the temporary shortage of lubricating oil and the increase in surface pressure are resolved, solid lubricant and synthetic resin are replenished from the surrounding antifriction layer, and the metal hard layer is again covered with the antifriction layer. Therefore, it is presumed that the slidability is restored and the wear of the spherical portion and the flat portion is also avoided. (2) The hard layer is made of Ni-P, Ni-B, Ni-P-B
The aluminum shoe according to item (1), including a hard plating layer such as -W, Co-P, or hard chrome plating. (3) The aluminum shoe according to (1) or (2), wherein the solid lubricant contains at least one of MoS ₂ , BN, WS ₂ , graphite, and polytetrafluoroethylene. . (4) The aluminum shoe according to (3), wherein the synthetic resin contains at least one of polyamide imide, epoxy resin, polyether ether ketone, and phenol resin. (5) The aluminum shoe according to any one of (1) to (4), wherein a metal layer containing a solid lubricant is formed between the hard layer and the anti-friction layer. ). Even if the anti-friction layer is formed directly on the hard layer, as described above, the slidability and durability of the aluminum shoe can be improved, but the metal containing a solid lubricant between the two layers can be improved. By forming the layer of
A better aluminum shoe can be obtained. If a metal layer containing a solid lubricant is formed on a base material of an aluminum shoe via a hard layer, and an anti-friction layer is formed on the metal layer containing the solid lubricant, all layers are firmly bonded to the base material. It can be fixed to the material. Moreover, as described above, even when the antifriction layer is locally removed, the exposed portion is the solid lubricant-containing metal layer having better lubricity than the hard layer, so that the temporary sliding property is reduced. Therefore, the sliding property and the durability can be more reliably improved. (6) The metal layer containing the solid lubricant is Ni-
(5) The aluminum shoe according to item (5), wherein a solid lubricant is contained in a hard plating layer such as B, Ni-P-B-W, Co-P, or hard chrome plating. The hard layer of Ni-P is made of a base material of aluminum shoe, Ni-B, Ni-P-B-W, C
This mode is particularly desirable because both the bonding strength with a hard plating layer such as o-P or hard chrome plating is sufficiently large.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an aluminum shoe for a swash plate type compressor used in a vehicle air conditioner according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a swash plate type compressor according to the present embodiment.
In FIG. 1, reference numeral 10 denotes a cylinder block, and a plurality of cylinder bores 12 extending in the axial direction are formed on one circumference around the central axis of the cylinder block 10. Each of the cylinder bores 12 has a single-headed piston 14 (hereinafter, referred to as a single-sided piston).
The piston 14 is abbreviated. A front housing 16 is mounted on one axial end surface of the cylinder block 10 (the left end surface in FIG. 1 and referred to as a front end surface), and the other end surface (the right end surface in FIG. 1 and a rear end surface). ), A rear housing 18 is mounted via a valve plate 20. The housing of the swash plate type compressor is constituted by the front housing 16, the rear housing 18, the cylinder block 10, and the like. A suction chamber 22 and a discharge chamber 24 are formed between the rear housing 18 and the valve plate 20, and are connected to a refrigeration circuit (not shown) via a suction port 26 and a supply port 28, respectively. The valve plate 20 has a suction hole 32, a suction valve 34, a discharge hole 36,
A discharge valve 38 and the like are provided.

A rotary shaft 50 is provided in the housing so as to be rotatable about a central axis of the cylinder block 10 as a rotational axis. The rotating shaft 50 is rotatably supported at both ends thereof by the front housing 16 and the cylinder block 10 via bearings.
A support hole 56 is formed in the center of the cylinder block 10 and is supported in the support hole 56 via the bearing. The end of the rotary shaft 50 on the front housing 16 side is connected to a vehicle engine as a drive source (not shown) via a clutch device such as an electromagnetic clutch. Therefore, when the rotating shaft 50 is connected to the vehicle engine by the clutch device during the operation of the vehicle engine, the rotating shaft 50 is rotated around its own axis.

A swash plate 60 is attached to the rotating shaft 50 so as to be relatively movable and tiltable in the axial direction. Swash plate 60
, A through hole 61 passing through the center line is formed, and the rotating shaft 50 passes through the through hole 61. The inner diameter of the through-hole 61 is gradually increased in the up-down direction in FIG. 1 as the both ends are opened, and the cross-sectional shape of each of the both ends forms an elongated hole. A rotating plate 62 is also fixed to the rotating shaft 50, and is received by the front housing 16 via a thrust bearing 64. The swash plate 60 is moved by the hinge mechanism 66.
In addition to being rotated integrally with the rotating shaft 50, tilting accompanied with axial movement is allowed. The hinge mechanism 66 includes a support arm 67 fixedly provided on the rotating plate 62 and a swash plate 6.
0, and the guide hole 68 of the support arm 67 is provided.
Guide pin 69 slidably fitted to the swash plate 6
0 and the outer peripheral surface of the rotating shaft 50.

The piston 14 has an engaging portion 70 which is engaged with the outer peripheral portion of the swash plate 60 in a state of straddling the same, and the head 7 which is provided integrally with the engaging portion 70 and is fitted to the cylinder bore 12.
2 is provided. The head 72 in the present embodiment is a hollow head to reduce the weight. The head 72, the cylinder bore 12, and the valve plate 20 together form a compression chamber. Further, the engaging portion 70 is engaged with the outer peripheral portion of the swash plate 60 via a pair of spherical-shaped shoes 76. The shoe 76 will be described later in detail.

The rotational movement of the swash plate 60 is converted into a reciprocating linear movement of the piston 14 via the shoe 76. In the suction stroke in which the piston 14 moves from the top dead center to the bottom dead center,
The refrigerant gas in the suction chamber 22 is supplied to the suction hole 32 and the suction valve 34.
And is sucked into the compression chamber in the cylinder bore 12. In the compression stroke in which the piston 14 moves from the bottom dead center to the top dead center, the refrigerant gas in the compression chamber in the cylinder bore 12 is compressed and discharged to the discharge chamber 24 through the discharge hole 36 and the discharge valve 38. With the compression of the refrigerant gas, the piston 14
An axial compression reaction force acts. The compression reaction force is piston 1
4, swash plate 60, rotating plate 62 and thrust bearing 6
4 to the front housing 16.

An air supply passage 80 is provided through the cylinder block 10. The discharge chamber 24 and the swash plate chamber 86 formed between the front housing 16 and the cylinder block 10 are connected by the air supply passage 80. An electromagnetic control valve 90 is provided in the middle of the air supply passage 80. The current supply to the solenoid 92 of the electromagnetic control valve 90 is controlled by a control device (not shown) mainly composed of a computer in accordance with information such as a cooling load.

A discharge passage 100 is provided inside the rotating shaft 50. The discharge passage 100 has one end opened to the support hole 56 and the other end opened to the swash plate chamber 86. The support hole 56 is communicated with the suction chamber 22 via the discharge port 104.

The swash plate type compressor is of a variable displacement type. The pressure in the swash plate chamber 86 is controlled by utilizing the pressure difference between the discharge chamber 24 on the high pressure side and the suction chamber 22 on the low pressure side. The difference between the pressure in the compression chamber in the cylinder bore 12 acting before and after the piston 14 and the pressure in the swash plate chamber 86 is adjusted,
The inclination angle of the swash plate 60 is changed, the stroke of the piston 14 is changed, and the displacement of the compressor is adjusted. Specifically, the pressure of the swash plate chamber 86 is controlled by controlling the excitation and demagnetization of the electromagnetic control valve 90 so that the swash plate chamber 86 is communicated with the discharge chamber 24 or cut off.

Cylinder block 10 and piston 14
Is made of an aluminum alloy, which is a kind of metal, and the outer peripheral surface of the piston 14 is coated with a fluororesin. By coating with a fluororesin, the fitting gap with the cylinder bore 12 can be reduced as much as possible while avoiding direct contact with the same kind of metal and preventing seizure. However, the material of the cylinder block 10 and the piston 14, the material of the coating layer, and the like are not limited to the above-described materials, and may be other materials.

The engaging portion 70 of the piston 14 is generally U-shaped, and has a pair of arms 120 and 122 extending parallel to each other in a direction perpendicular to the central axis of the head 72, and a base of the arms 120 and 122. Connecting part 1 connecting the ends
24. A concave spherical surface 128 is formed on each of the side surfaces of the arm portions 120 and 122 facing each other. These two concave spherical surfaces 128 are located on the same spherical surface.

As shown in FIG. 2, the pair of shoes 76 has a spherical portion 132 having one of its outer surfaces forming a generally convex spherical surface.
And the other has a generally flat planar portion 138. Strictly speaking, the flat portion 138 is a slightly curved surface having a middle height (for example, a convex spherical surface having an extremely large radius of curvature), and the outer peripheral portion is a tapered surface having an extremely large taper value. The portion of the spherical portion 132 closer to the flat portion 138 is a cylindrical surface. Boundaries such as a middle-high curved surface, a tapered surface, a cylindrical surface, and a convex spherical surface are rounded with a relatively small radius of curvature. The pair of shoes 76 is formed on the spherical portion 132 by the concave spherical surface 1 of the piston 14.
The swash plate 60 is slidably held by the flat surface portion 138 and comes into contact with both sliding surfaces 140 and 142 which are both side surfaces of the outer peripheral portion of the swash plate 60 to sandwich the outer peripheral portion of the swash plate 60 from both sides. The pair of shoes 76 is designed so that the convex spherical surface of the spherical portion 132 is located on the same spherical surface in that state. That is, the shoe 76 in the present embodiment has a spherical crown shape that is substantially half the thickness of the swash plate 60.

The base material 146 of the shoe 76 is made of an azil alloy containing aluminum as a main component and silicon. The swash plate 60 is made of steel, which is a kind of iron-based material, and has two sliding surfaces 140, 1 with the flat portion 138 of the shoe 76.
42, a material mainly composed of aluminum is sprayed and an anti-friction layer made of a synthetic resin containing a solid lubricant is formed. The sliding surfaces 140 and 142 may be quenched to omit thermal spraying of a material containing aluminum as a main component. Alternatively, the swash plate 60 is made of a material containing aluminum as a main component, and the sliding surfaces 140 and 142 are used.
In some cases, an iron-based material is sprayed. The material of the swash plate 60 is not limited to the above-described materials, but may be a copper-based material such as lead bronze or brass. Further, the swash plate 60 may be formed by joining a copper-based material to the surface of an iron-based material by thermal spraying or sintering, or may be a combination of other materials.

On the base material 146 of the shoe 76, the base material 1
A hard layer 150 covering the entire surface of the hard layer 150 is formed, and another hard layer 152 covering the entire outer surface of the hard layer 150 is formed on the hard layer 150, and further, the entire outer surface of the hard layer 152 is covered. An anti-friction layer 154 is formed. In FIG. 2, the thicknesses of the hard layers 150 and 152 and the anti-friction layer 154 are exaggerated for easy understanding.
Each hard layer 150 and 152 is a metal mainly composed of a Vickers hardness H _V 300 or more layers. The layer mainly composed of metal is preferably a layer having a metal content of 70% by weight or more. The hard layer 150 is made of, for example, N
It can be a hard plating layer such as IP, Ni-B, Ni-P-B-W, Co-P, hard chromium plating and the like. In the present embodiment, a Ni-P plating layer is formed. The Ni-P plating layer contains 90 to 92% by weight of Ni,
P is 8-10% by weight of the composition, is generally Vickers hardness H _V 400 to 550.

The hard layer 152 is made of Ni-B, Ni-P-B
A hard plating layer such as -W, Co-P, hard chromium plating or the like can be used. In the present embodiment, the Ni-B plating layer is used. Ni-B plating layer, Ni is about 99 wt%, B is the composition of about 1% by weight, is generally Vickers hardness H _V 700 to 900. The Ni—P plating layer, Ni—B plating layer, Ni—P—B—W plating layer, and Co—P plating layer are all electroless plating layers (chemical plating layers) and are formed by a known chemical plating method. You. According to this method, two plating layers having a uniform thickness can be formed on the base material 146 with an easy and simple apparatus.

The anti-friction layer 154 is a synthetic resin layer containing a solid lubricant 158, as shown in FIG.
As the solid lubricant 158, one containing at least one of MoS ₂ (molybdenum disulfide), BN (boron nitride), WS ₂ (tungsten disulfide), graphite, polytetrafluoroethylene, etc. is adopted. Can,
As synthetic resins, polyamide imide, epoxy resin,
Polyetheretherketone, phenolic resin and the like can be employed. These polyamide imide, epoxy resin, polyether ether ketone, and phenol resin are excellent in heat resistance, and include the solid lubricant 158 to improve wear resistance and reduce friction coefficient. The anti-friction layer 154 is formed as follows. After forming the hard layers 150 and 152 on the base material 146 to obtain an intermediate product, the anti-friction layer 154 is formed on the intermediate product by a known method such as tumbling or spraying. In the case of the tumbler process, a plurality of shoes 76 are accommodated in the tumbler, and while rotating the tumbler,
A liquid coating material, which is a material for forming the above-described anti-friction layer 154, is sprayed from the outside of the tumbler to uniformly adhere the coating material. In the case of spraying, a plurality of shoes 76
And spray the liquid coating material to make it adhere evenly. After the tumbling process or the spraying process, the applied material is cured to form the anti-friction layer 154. Note that, if necessary, at least one of sandblasting and chemical conversion may be performed on the intermediate product before the tumbling or spraying.

According to the present embodiment, the spherical portion 1 which is a sliding surface that slides on the piston 14 and the swash plate 60 of the shoe 76.
32 and the flat portion 138 are formed by the anti-friction layer 154, so that the shoe 76 having excellent slidability is obtained. While the sliding resistance of the shoe 76 is reduced,
Seizure of the same metal between the spherical portion 132 and the concave spherical surface 128 of the piston 14 due to sliding, and the flat portion 132 and the swash plate 60
Of the sliding surfaces 140 and 142 can be satisfactorily prevented. Further, since the base material 146 of the shoe 76 made of a material containing aluminum as a main component is covered with the hard layers 150 and 152 having a higher hardness than the base material 146, the strength of the shoe 76 is increased, and the durability of the shoe 76 and the durability of the shoe 76 are further increased. The durability of the swash plate type compressor including the piston 14 is improved. Further, by interposing the hard layers 150 and 152 made of metal between the base material 146 and the anti-friction layer 154, the adhesion (adhesion) between the anti-friction layer 154 and the base material 146 is increased.
Exfoliation of the anti-friction layer 154 from the base material 146 can be favorably prevented.

A base material 146 and a hard layer (Ni in this embodiment)
-B plating layer) 152 and the hard layer (Ni-P plating layer in this embodiment) 150 formed between the base layer 146 and the hard layer 152 have a large adhesive strength. And functions to enhance the adhesion between the base material 146 and the Ni-B plating layer. Ni-B is generally Ni
Although the hardness is higher than that of -P and the wear resistance is excellent, the formation cost is higher than that of the Ni-P plating layer. Therefore, Ni
It is desirable to form the -P plating layer relatively thick, and to form the Ni-B plating layer thereon relatively thin. The same can be said for the case where the hard layer 152 is a Ni—P—B—W plating layer. The Ni-P plating layer also functions as a buffer layer when an impact is applied to the Ni-B plating layer.
Thereby, peeling and chipping of the hard layer 152 from the base material 146 are properly prevented, and the slidability and durability of the shoe 76 are maintained for a longer period.

In the event that the anti-friction layer 154 is worn out, the base material 146 is not exposed, only the hard layer 152 is exposed. If the operation of the compressor is continued for a long period of time, the wear resistance of the anti-friction layer 154 of the shoe 76 is reduced, and when the lubricating oil on the shoe 76 is insufficient or the surface pressure is increased, local wear is caused. There is also. In this case, the anti-friction layer 1
The hard layer 152 will be exposed from the portion where 54 has been removed. As described above, since the hard layer 152 has high adhesion to the base material 146 and excellent abrasion resistance,
The hard layer 152 and the hard layer 150 are removed, so that the base material 146 is not exposed.
4 and seizure with the swash plate 60 are prevented. Further, the surface pressure on the shoes 76 changes periodically with the rotation of the swash plate 60, and while the surface pressure on the shoes 76 decreases, the anti-friction layer 154 is supplied from the surroundings and repaired. The restoration is presumed to be performed as follows. Due to the frictional force and the frictional heat, the anti-friction layer 154 containing the surrounding solid lubricant 158 flows to the worn or separated portion of the anti-friction layer 154. As a result, the portion where the hard layer 150 is exposed due to the wear or peeling of the anti-friction layer 154 is covered with the anti-friction layer 154 again to be repaired. Since the antifriction layer 154 is repaired when the surface pressure on the shoe 76 decreases in this way, it is estimated that high slidability is maintained for a long period of time.

In the compressor provided with the shoes 76 in this embodiment, the compressor gas is in a state of insufficient lubricating oil due to leakage of refrigerant gas to the outside of the compressor (the ultimate state is a dry (non-lubricated) state). The excellent slidability of the shoe 76 is maintained even under severe conditions such as
Or swash plate 60 or shoe 76 and piston 14
Is prevented, and a reduction in the life of the shoe 76 and, consequently, the compressor is well avoided. Experiments have confirmed that the shoe 76 of the present embodiment has excellent slidability even when the lubricating oil in the compressor is insufficient. This experiment measures the time required for a shoe and a piston or a shoe and a swash plate to be seized and locked under the condition that the compressor is operated in a dry state and the rotation speed of the swash plate 60 is 1000 rpm. The time required for locking was compared between a compressor having a conventional shoe and a compressor having a shoe 76 according to the present invention. As a conventional shoe, a Vickers hardness H is mainly formed on a base material made of a material containing aluminum as a main component.
A hard layer having a _{V of} 300 or more (for example, a Ni-P-B-W plating layer) was formed. In a conventional shoe, the first measurement was 44 seconds, the second was 54 seconds, and the average was 4 seconds.
Although the locked state was achieved in 9 seconds, in the shoe 76 according to the present invention, in the case of the shoe 76 in which the antifriction layer 154 is formed on the entire outer surface of the hard layer 152, 74 seconds, only the spherical portion 132 is provided. In the case of the shoe 76 on which the anti-friction layer 154 was formed, the locked state was achieved in 73 seconds. That is, in the shoe 76 according to the present invention, the slidability is significantly improved as compared with the conventional shoe.

If necessary, the spherical portion 132 of the shoe 76
The anti-friction layer 154 may be formed only on one of the surface portion 138 and the flat portion 138. For example, as shown in FIG.
In addition to forming the hard layers 150 and 152 on the entire surface of the base material 146 of No. 00, the anti-friction layer 154 can be formed only on the spherical portion 132. Alternatively, as shown in FIG. 5, the hard layers 150 and 15 are formed over the entire surface of the base material 146 of the shoe 300.
2, the anti-friction layer 154 can be formed only on the flat portion 138.

As shown in FIG. 6, the hard layer 152 is made of a solid material.
A metal layer containing the lubricant 400 can also be used.
As the solid lubricant 400, for example, MoS_Two, BN,
WS _Two, Graphite, polytetrafluoroethylene
One that includes at least one can be employed. This
In this case, the anti-friction layer 154 is worn away and the hard layer 152
Hard layer 152 is solid lubricant 400 even when
Is a layer excellent in lubricity containing
The decrease in slidability is reduced, and the shoe 76, the piston 14 and
Seizure with the swash plate 60 is well prevented.

The shoe according to the present invention can be used for a fixed displacement type swash plate type compressor such as a swash plate type compressor having a double-headed piston having heads on both sides of an engagement portion with a swash plate. In addition, the present invention includes various embodiments based on the knowledge of those skilled in the art, including the embodiments described in the section [Problems to be Solved by the Invention, Problem Solving Means and Effects]. Can be implemented.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a swash plate type compressor provided with an aluminum shoe according to an embodiment of the present invention.

FIG. 2 is a front sectional view of the aluminum shoe.

FIG. 3 is an enlarged front sectional view showing a part of the aluminum shoe.

FIG. 4 is a front sectional view of an aluminum shoe according to another embodiment of the present invention.

FIG. 5 is a front sectional view of an aluminum shoe according to still another embodiment of the present invention.

FIG. 6 is an enlarged front sectional view showing a part of an aluminum shoe according to still another embodiment of the present invention.

[Explanation of symbols]

14: Single head piston 60: Swash plate 76: Shoe
132: spherical portion 138: flat portion 146: base material 150, 152: hard layer 154: anti-friction layer 158: solid lubricant 200, 300: shoe 4
00: Solid lubricant

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) F04B 27/08 H (72) Inventor Tomohiro Murakami 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Loom Works (72) Inventor Takahiro Sugioka 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyoda Automatic Loom Works, Ltd. F term in the loom mill (reference) 3H076 AA06 BB26 CC20 CC33 CC34 4D075 BB87X CA02 CA09 CA18 DA23 DB01 DB07 DC13 DC19 EA37 EB32 EB33 EB39 EB44 EC01 EC07 EC10 EC60 4K022 AA02 AA31 AA41 AA48 BA04 BA04 BA18 BA18 BA14 BA19 BA21 BB03 BB04 BB11 BC01 BC06 CA15 CA53

Claims (4)

[Claims] 1. An aluminum shoe having a generally spherical crown shape and comprising a generally spherical surface portion and a generally planar surface portion, which is made of a material containing aluminum as a main component, wherein the spherical portion and the flat surface are formed. Vickers hardness H _V 30
0 or more metal hard layers were formed, and an anti-friction layer, which was a layer of a synthetic resin containing a solid lubricant, was formed outside at least one of the spherical and flat metal hard layers. Features aluminum shoe. 2. The method according to claim 1, wherein the solid lubricant is MoS ₂ , BN, WS.
_2. The aluminum shoe according to claim 1, comprising at least one of ₂ , graphite, and polytetrafluoroethylene. 3. The aluminum shoe according to claim 1, wherein the synthetic resin contains at least one of polyamide imide, epoxy resin, polyether ether ketone, and phenol resin. 4. The aluminum shoe according to claim 1, wherein a metal layer containing a solid lubricant is formed between said hard layer and said antifriction layer.