JP2001065453A - Swash plate type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the wear and seizure of a shoe or shoe disk. SOLUTION: This shoe disk 71 comprises a flat part 71a in contact with a sliding surface of a swash plate and a recessed surface part 71b allowing the spherical end part of a connecting rod to be rolled relatively to each other, and a peripheral edge part 71c formed at the outer peripheral edge of the flat part 71a and brought into contact with the sliding surface of the swash plate when the moving direction of a piston is changed. In this case, the peripheral edge part 71c of the shoe disk 71 is formed so as to draw a smooth curve from the outer peripheral edge of the flat part 71a in the outer radial direction. Thus, when the moving direction of the piston is changed, a load applied from the swash plate to the peripheral edge part 71c of the shoe disk 71 can be dispersed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a swash plate type compressor.

[0002]

2. Description of the Related Art FIG. 5 is a partially enlarged sectional view showing a conventional swash plate type compressor, FIG. 6 is a view showing a shoe disk, and FIG. 5 (a) is a sectional view of the shoe disk and FIG. 2 is a partially enlarged view of FIG.

[0003] The swash plate compressor is supported by a shaft and rotates integrally with the shaft.
The piston 207 linearly reciprocates in the cylinder bore with the rotation of 0, the connecting rod 211 attached to the piston 207, and the swash plate 210 attached to the swash plate 210 so as to be relatively rotatable. Disc 271 which is disposed between the swash plate 210 and the spherical end 211a of the connecting rod 211, and which relatively rotates on the sliding surface 210a of the swash plate 210 as the swash plate 210 rotates. And

[0006] As shown in FIG. 6, the shoe disk 271 has a flat portion 27 that contacts the sliding surface 210 a of the swash plate 210.
1a and the spherical end 211 of the connecting rod 211
a and a peripheral portion 271c formed on the outer peripheral edge of the flat portion 271a and in contact with the sliding surface 210a of the swash plate 210 when the traveling direction of the piston 207 changes. Have. The radius of curvature R of the peripheral portion 271c is small as shown in FIG.

[0005] As shown in FIG.
A clearance C is provided between the swash plate 210 and the swash plate 210 so that the swash plate compressor can normally operate even if components such as the shoe disk 271 and the swash plate 210 undergo thermal expansion due to a temperature change. . When the swash plate type compressor is operated, the clearance C increases due to friction between the shoe disk 271 and the swash plate 210.

As the swash plate 210 rotates, the piston 207
Reciprocates linearly in the cylinder bore. Piston 207
Moves from top dead center to bottom dead center while shoe disk 27
1 receives a load from the swash plate 210 via the retainer 253, but does not receive a load directly from the swash plate 210. At this time,
Since the clearance C exists between the swash plate 210 and the shoe disk 271 as described above, the sliding surface 2 of the swash plate 210
10a and the flat part 271a of the shoe disk 271 are separated, and the shoe disk 271 is shaky. Immediately after the piston 207 reaches the bottom dead center and starts moving toward the top dead center, the swash plate 210 and the shoe disk 271 collide. At this time, a large load is generated on the shoe disk 271.

FIG. 7 is a view showing one of a pair of shoes of another conventional swash plate type compressor. FIG. 7 (a) is a sectional view of the shoe, and FIG. 7 (b) is a portion of FIG. It is an enlarged view.

This swash plate type compressor is arranged so as to sandwich the swash plate, and a pair of substantially hemispherical shoes 260 which relatively rotate on both sliding surfaces of the swash plate as the shaft rotates.
And a concave portion provided at one end thereof for rotatably supporting the pair of shoes 260, and a piston that linearly reciprocates in the cylinder bore as the swash plate rotates.

The shoe 260 is located between the flat portion 260a that contacts the sliding surface of the swash plate, the convex portion 260b supported by the concave portion of the piston, and the flat portion 260a and the convex portion 260b. A peripheral portion 260c that comes into contact with the sliding surface of the swash plate when the direction changes. Rim 26
The radius of curvature S of 0c is small as shown in FIG.

[0010] A clearance is provided between the shoe 260 and the swash plate as in the above-described conventional swash plate compressor.

As with the conventional swash plate compressor described above, the piston reciprocates linearly as the swash plate rotates, and the swash plate and the shoe 260 collide immediately after the direction of travel of the piston changes.

A similar phenomenon occurs not only when the piston is located near bottom dead center but also when it is located near top dead center.

Therefore, a large load is applied to the rear and front shoes 260.

[0014]

However, as described above, since the radii of curvature R and S of the peripheral portion 271c are small, a large load is concentrated on the narrow place. When the load is repeatedly and frequently applied to the shoe 260 or the shoe disk 271, the hard coating applied to the surface of the shoe 260 or the shoe disk 271 peels off, causing a problem that abrasion or seizure occurs.

The present invention has been made in view of such circumstances, and an object thereof is to prevent wear and seizure of a shoe or a shoe disk.

[0016]

According to a first aspect of the present invention, there is provided a swash plate type compressor, wherein the swash plate type compressor is supported by a rotating shaft and rotates integrally with the rotating shaft. A reciprocating piston, a connecting rod attached to the piston, a retainer attached to the swash plate for relative rotation and supporting a spherical end of the connecting rod via a washer, and the swash plate and the connecting member. A swash disk disposed between the swash plate and the spherical end of the rod, the shoe disk being relatively rotated on the sliding surface of the swash plate as the swash plate is rotated. A flat portion that contacts the sliding surface of the plate, a concave portion that supports the spherical end of the connecting rod so as to be able to relatively roll, and is formed on an outer peripheral edge of the flat portion, A peripheral portion that comes into contact with the sliding surface of the swash plate when the traveling direction of the piston changes, and the peripheral portion of the shoe disk has a gentle curve from the outer peripheral edge of the flat portion to the outside in the radial direction. It is characterized by being formed on a curved surface to be drawn.

As described above, since the peripheral portion of the shoe disk is formed so as to form a gentle curve radially outward from the outer peripheral edge of the flat portion, the load applied to the peripheral portion from the swash plate can be dispersed. .

According to a second aspect of the present invention, there is provided a swash plate type compressor, wherein the swash plate is supported by the rotating shaft and rotates integrally with the rotating shaft, and is disposed so as to sandwich the swash plate. A pair of substantially hemispherical shoes that relatively rotate on both sliding surfaces of the swash plate with rotation of the swash plate, and a concave portion that supports the pair of shoes in a rollable manner at one end thereof, A swash plate compressor including a piston that linearly reciprocates in a cylinder bore as the cylinder rotates, wherein the shoe has a flat portion that contacts a sliding surface of the swash plate, and a convex portion that is supported by a recess of the piston. A peripheral portion which is located between the flat portion and the convex portion, and which comes into contact with a sliding surface of the swash plate when the traveling direction of the piston changes, the peripheral portion of the shoe is the flat portion; Radially outward from the outer edge of Wherein the Te is formed into a curved surface drawn in smooth curves.

As described above, since the peripheral portion of the shoe is formed so as to form a gentle curve radially outward from the outer peripheral edge of the flat portion, the load applied to the peripheral portion from the swash plate can be dispersed.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a variable displacement swash plate type compressor according to an embodiment of the present invention, FIG. 2 (a) is a sectional view of a shoe disk, and FIG. 2 (b) is that of FIG. It is a partial enlarged view.

A rear head 3 is provided on one end surface of a cylinder block 1 of this variable displacement compressor through a valve plate 2.
However, front heads 4 are fixed to the other end surfaces, respectively. The cylinder block 1 is provided with a plurality of cylinder bores 6 at predetermined intervals in a circumferential direction around a shaft (rotating shaft) 5. A piston 7 is slidably accommodated in each of the cylinder bores 6.

A crank chamber 8 is provided in the front head 4.
A swash plate 10 and the like are accommodated in the crank chamber 8.

The swash plate 10 is mounted on the shaft 5 so as to be tiltable.

A retainer 53 is mounted on the swash plate 10 via a radial bearing 55 so as to be rotatable relative to the swash plate 10. The radial bearing 55 is fixed to the swash plate 10 by a stopper 54. Connecting rod 11 on piston 7
Is attached. The retainer 53 supports the spherical end 11a of the connecting rod 11 via the washer 50. Between the swash plate 10 and the spherical end 11a of the connecting rod 11, there is provided a shoe disk 71 which relatively rotates on the rear sliding surface 10a of the swash plate 10.

As shown in FIG. 2 (a), the shoe disc 71 has a flat portion 71a which contacts the sliding surface 10a of the swash plate 10.
A concave surface portion 71b that supports the spherical end portion 11a of the connecting rod 11 so as to be able to relatively roll; and a sliding surface of the swash plate 10 formed on the outer peripheral edge of the flat portion 71a when the traveling direction of the piston 7 changes. And a peripheral edge portion 71c that comes into contact with 10a. Also, a peripheral edge portion 71c of the shoe disk 71
Are formed on a curved surface that draws a gentle curve from the outer peripheral edge of the flat portion 71a to the outside in the radial direction. Shoe disk 7
On the surface of No. 1, a hard coating of carbon is deposited.

The valve plate 2 is provided with a discharge port 16 for communicating the cylinder bore 6 with the discharge chamber 12 and a suction port 15 for communicating the cylinder bore 6 with the suction chamber 13 at predetermined intervals in the circumferential direction. I have.

The discharge port 16 is opened and closed by a discharge valve 17, and the discharge valve 17 is fixed to an end face on the rear head side of the valve plate 2 by a bolt 19 together with a valve retainer 18.

The suction port 15 is opened and closed by a suction valve 21, and the suction valve 21 is disposed between the valve plate 2 and the cylinder block 6.

The radial bearing 25 and the thrust bearing 24 support the rear end of the shaft 5, and the front end of the shaft 5 is rotatably supported by a radial bearing 26.

A thrust flange 40 for transmitting the rotation of the shaft 5 to the swash plate 10 is fixed to the front end of the shaft 5, and the thrust flange 40 is provided on the inner wall surface of the front head 4 via a thrust bearing 33. It is rotatably supported. The thrust flange 40 and the swash plate 10 are connected via a link mechanism 41, and the swash plate 10 can be inclined with respect to a plane perpendicular to the shaft 5.

The link mechanism 41 includes a thrust flange 40
Arm 40a provided on the end face of the swash plate 10
0, a projecting piece 10d,
10d, and a long hole 40b of the arm 40a
And a pin 43 to be engaged.

A winding spring 47 for urging the swash plate 10 in a direction to reduce the inclination angle of the swash plate 10 is mounted between the thrust flange 40 and the swash plate 10, and between the swash plate 10 and the cylinder block 1. Is mounted with a leaf spring 48 for urging the swash plate 10 in a direction to increase the inclination angle of the swash plate 10.

Next, the operation of the variable displacement type swash plate type compressor will be described.

When the rotational power of the vehicle-mounted engine (not shown) is transmitted to the shaft 5, the rotational force of the shaft 5 is transmitted to the swash plate 10 via the link mechanism 41, and the swash plate 10 rotates.

The rotation of the swash plate 10 causes the shoe disc 71 to rotate.
Is relatively rotated on the sliding surface 10a of the swash plate 10.
The torque from zero is converted into a linear reciprocating motion of the piston 7.

The piston 7 reciprocates in the cylinder bore 6, and as a result, the volume of the compression chamber 22 in the cylinder bore 6 changes, and the suction, compression, and discharge of the refrigerant gas are sequentially performed by this volume change. A high-pressure refrigerant gas having a capacity corresponding to the inclination angle is discharged. In the suction stroke, the suction valve 21 is opened, and low-pressure refrigerant gas is sucked from the suction chamber 13 into the compression chamber 22 in the cylinder bore 6, and in the discharge stroke, the discharge valve 16
Is opened, and the high-pressure refrigerant gas is discharged from the compression chamber 22 to the discharge chamber 12.

When the heat load decreases and the pressure regulating valve 81 opens the communication passage, and the pressure in the crank chamber 8 increases, the swash plate 10
Slides on the shaft 5, the inclination angle of the swash plate 10 decreases, and as a result, the stroke amount of the piston 7 decreases, and the discharge capacity decreases.

On the other hand, when the heat load increases and the pressure regulating valve 81 closes the communication passage and the pressure in the crank chamber 8 decreases, the swash plate 10 slides on the shaft 5, and the swash plate 10
Is increased, and as a result, the stroke amount of the piston 7 is increased, and the discharge capacity is increased.

As described above, since the peripheral edge portion 71c of the shoe disk 71 is formed to have a gentle curve radially outward from the outer peripheral edge of the flat portion 71a, immediately after the traveling direction of the piston 7 changes, Peripheral part 71c
The load received from the swash plate 10 is dispersed.

According to the embodiment of the present invention, peeling of the hard film applied to the surface of the shoe disk 71 is suppressed, wear and seizure of the shoe disk 71 are prevented, and the reliability of the variable displacement type swash plate type compressor is improved. improves.

FIG. 3 is a longitudinal sectional view showing a variable displacement swash plate type compressor according to another embodiment of the present invention, FIG. 4 (a) is a sectional view of a shoe, and FIG. FIG.

Portions common to the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In the above-described embodiment, the shoe disk 7 is used as a member for transmitting the rotational force of the swash plate 10 to the piston 7 in order to convert the rotation of the swash plate 10 into a reciprocating linear motion of the piston 7.
1, washer 50, retainer 53, radial bearing 55,
Although the case where the stopper 54 and the connecting rod 11 are used has been described, in this embodiment, a pair of hemispherical shoes 60 and 61 and a piston 107 are provided on the rear and front sliding surfaces 110 b and 110 a of the swash plate 110. At one end, recesses 107a and 107b for supporting the pair of shoes 60 and 61 in a rolling manner are provided.

The pair of shoes 60 and 61 are arranged so as to sandwich the swash plate 110,
a and 107b so as to be rollable.

The shoes 60 and 61 are, as shown in FIG.
Flat portions 60a, 61a contacting both sliding surfaces 110b, 110a of the swash plate 110;
a, 107b, between the flat portions 60a, 61a and the convex portions 60b, 61b, and both sliding surfaces of the swash plate 110 when the traveling direction of the piston 107 changes. There are provided peripheral portions 60c, 61c that come into contact with 110b, 110a. Also, shoes 60, 6
One of the peripheral portions 60c, 61c is formed into a curved surface that draws a gentle curve radially outward from the outer peripheral edge of the flat portions 60a, 61a. A hard carbon film is deposited on the surfaces of the shoes 60 and 61.

Between the thrust flange 40 and the swash plate 110, the swash plate 11 is moved in a direction in which the inclination angle of the swash plate 110 is reduced.
A helical spring 47 for urging the swash plate 110 is mounted between the swash plate 110 and the cylinder block 6, and a helical spring 148 for urging the swash plate 110 in a direction to increase the inclination angle of the swash plate 110 is mounted.

The link mechanism 141 includes a bracket 110c provided on the front side of the swash plate 110 and a bracket 1c.
It is composed of a linear guide groove 110d provided in 10c and a rod 143 screwed to the thrust flange 40. The longitudinal axis of the guide groove 110d is inclined at a predetermined angle with respect to the sliding surface of the swash plate 110. The spherical tip portion 143a of the rod 143 is fitted into the guide groove 110d so as to be relatively slidable.

The peripheral portions 60c of the aforementioned shoes 60, 61,
The swash plate 110c is formed as a gentle curve radially outward from the outer peripheral edges of the flat portions 60a, 61a.
Is rotated, and the concentrated load received from the swash plate 10 by the peripheral portions of the shoes 60 and 61 immediately after the traveling direction of the piston 107 changes.

According to the embodiment of the present invention, the same effects as in the above-described embodiment can be obtained.

In each of the above embodiments, the variable displacement type single swash plate type compressor is described. However, the present invention can be applied to a fixed displacement type single swash plate type compressor and a fixed displacement type double swash plate type compressor.

In each of the above embodiments, the shoe 6
Although a case has been described in which a hard coating process for evaporating carbon is applied to the surface of the shoe disk 61 or the shoe disk 71, a surface treatment by a nickel-phosphorus-boron plating method or the like can also be applied.

[0053]

As described above, according to the swash plate type compressor of the present invention, wear and seizure of the shoe or the shoe disk are prevented, and the reliability of the swash plate type compressor is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a variable displacement stencil type compressor according to one embodiment of the present invention.

FIG. 2 is a view showing a shoe disk of the variable displacement compressor according to one embodiment of the present invention, wherein FIG. 2 (a) is a cross-sectional view of the shoe disk, and FIG. It is the elements on larger scale of a).

FIG. 3 is a longitudinal sectional view showing a variable displacement swash plate type compressor according to another embodiment of the present invention.

FIG. 4 is a view showing a shoe of a swash plate type compressor according to another embodiment of the present invention, wherein FIG. 4 (a) is a sectional view of the shoe, and FIG. 4 (b) is FIG. FIG.

FIG. 5 is a partially enlarged sectional view showing a conventional swash plate type compressor.

FIG. 6 is a view showing a shoe disk of a conventional swash plate type compressor, and FIG. 6 (a) is a sectional view of the shoe disk;
FIG. 2B is a partially enlarged view of FIG.

FIG. 7 is a view showing one of a pair of shoes of another conventional swash plate type compressor, and FIG. 7 (a) is a sectional view of the shoes;
FIG. 2B is a partially enlarged view of FIG.

[Explanation of symbols]

 5 Shaft 6 Cylinder bore 7 Piston 10 Swash plate 11 Connecting rod 11a Spherical end 50 Washer 53 Retainer 60, 61 Shoe 60b, 61b Convex part 60c, 61c, 71c Peripheral part 60a, 61a, 71a Flat part 71 Shoe disk 71b Concave part

Claims (2)

[Claims] A swash plate supported on a rotating shaft and rotating integrally with the rotating shaft; a piston reciprocating linearly in a cylinder bore as the swash plate rotates; a connecting rod attached to the piston; A retainer attached to the swash plate so as to be relatively rotatable and supporting a spherical end of the connecting rod via a washer; and a retainer disposed between the swash plate and the spherical end of the connecting rod to rotate the swash plate. A swash plate type compressor having a shoe disk that rotates relatively on the sliding surface of the swash plate, wherein the shoe disk has a flat portion that contacts the sliding surface of the swash plate, and a spherical portion of the connecting rod. A concave portion supporting the end portion so as to be able to relatively roll, and formed on the outer peripheral edge of the flat portion, the swash plate is formed when the traveling direction of the piston changes. A swash plate type compression having a peripheral portion that contacts a moving surface, wherein the peripheral portion of the shoe disc is formed into a curved surface that draws a gentle curve from the outer peripheral edge of the flat portion to the outside in the radial direction. Machine. 2. A swash plate supported by the rotating shaft and rotating integrally with the rotating shaft; and a swash plate arranged to sandwich the swash plate, and on both sliding surfaces of the swash plate as the rotating shaft rotates. A pair of substantially hemispherical shoes that relatively rotate the same, and a recess that is provided at one end so as to be able to roll the pair of shoes, and a piston that linearly reciprocates in a cylinder bore as the swash plate rotates. In the swash plate type compressor comprising: the shoe, a flat portion that contacts a sliding surface of the swash plate,
A convex portion supported by the concave portion of the piston, and a peripheral portion located between the flat portion and the convex portion and in contact with the sliding surface of the swash plate when the traveling direction of the piston changes. A swash plate compressor, wherein a peripheral portion of the shoe is formed into a curved surface that draws a gentle curve from an outer peripheral edge of the flat portion toward a radially outer side.