JP2003139051A - Piston of single swash plate-type compressor and single swash plate-type compressor using the piston - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swash plate-type compressor provided with a piston with a structure reducing the heat generated by the contact of two components, lowering a temperature of the compressor as a whole by reducing the heat generation, and improving the life of the compressor. SOLUTION: In the single swash plate-type compressor having a structure that the rotation of a shaft rotor is transmitted to the swash plate having a variable angle structure, a pair of shoes mounted at both face sides of the swash plate are held by a shoe having part of the piston 10, and the rotation of the swash plate is converted into reciprocation of the piston 10, the piston is reciprocated in a bore formed on a cylinder block, and the auto-rotation of the piston generated in accompany with the rotation of the swash plate is supported by a rotation inhibiting part formed by an inner wall face of a front housing and the piston. The piston 10 is provided with the shape having a heat radiating mechanism 1a near a part of contact motion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston structure of a one-sided swash plate compressor of a compressor for an air conditioning system for a vehicle, the piston having a mechanism for radiating heat generated by sliding of the piston.

[0002]

2. Description of the Related Art Conventionally, a swash plate type compressor of this type is provided so as to be inclined with respect to a shaft housed in a housing, and is rotated by a rotor provided on the shaft, and one end of a shaft of the housing. A cylinder block having a plurality of cylinder bores provided around the shaft, a single-headed piston reciprocating in the cylinder bore, and a shoe provided in a shoe holder recessed at one end of the single-headed piston. Hereinafter, this type of swash plate compressor will be referred to as a single swash plate compressor. In this conventional one-sided swash plate compressor, a pair of shoes are in sliding contact with both end surfaces of the outer periphery of the swash plate. When the shaft rotates, the outer peripheral surface of the swash plate reciprocates along the axial direction. The reciprocating motion of both end faces of the outer periphery is converted into the reciprocating motion of the single-head piston in the cylinder bore through the shoe, and the reciprocating motion of the single-head piston causes the fluid sucked from the suction chamber into the cylinder bore to be compressed and discharged from the cylinder bore. Is discharged into the chamber. In addition, there is a conventional one-sided swash plate compressor in which the swash plate has a variable angle structure in which the inclination angle can be changed by a capacity control mechanism.

FIG. 14 (a) is a plan view of a single-headed piston of a conventional swash plate compressor, FIG. 14 (b) is a front view, and FIG. 14 (c) is a side view. Referring to FIGS. 14A to 14C, the single-headed piston 100 is arranged on the swash plate and both end surfaces around the swash plate so as to reciprocate in a bore provided in a cylinder of a not-shown single-swash plate compressor. A shoe holding portion 105 for accommodating a pair of substantially hemispherical shoes is provided. The single-headed piston 100 includes a substantially cylindrical piston body 101, a piston neck portion 102 provided at one end of the piston body 101, and a piston bottom portion 103 following the piston neck portion 102.

The piston bottom portion 103 is provided with a rotation preventing portion 104 which is in sliding contact with an inner wall of the housing (not shown) and prevents rotation of the piston body 101 in the cylinder bore. The above-mentioned piston neck portion 102 and the piston bottom portion 1
A shoe holding portion 105 which is recessed so as to accommodate the swash plate and the shoe is provided between the shoe holding portion 03 and the shoe 03. Shoe holder 10
In the axially opposed surfaces of the piston 5 of FIG. 5, round recesses 106 and 106 are formed so that the hemispherical surfaces of the shoes come into contact with each other.

In the conventional swash plate type compressor having such a structure, the rotation of the shaft rotor is transmitted to the swash plate having the variable angle structure, and the pair of shoes arranged on both sides of the swash plate holds the shoes of the piston. It is held by the portion 105 and is provided with a structure for converting the rotation of the swash plate into the reciprocation of the piston. The piston reciprocates in the bore formed in the cylinder block, and the rotation of the piston generated by the rotation of the swash plate is converted into It is blocked by a rotation blocking part formed on the inner wall surface and the piston.

However, in the conventional single-sided swash plate type compressor, in the single-headed piston, in the compression process, the piston is bent by the pressing force of the swash plate, for example, in the counterclockwise bending direction in FIG. It receives a moment, tilts with respect to the axis, and is further rotated until it comes into contact with the inner peripheral surface of the front housing due to the rotation of the swash plate. Therefore, the edge at the axial end and the inner peripheral surface of the housing are almost Rub in one point,
This results in a significant increase in wear. Immediately after the suction process is completed and the process is shifted to the compression process, the piston exerts an inertial force due to its own movement, and receives a bending moment in the clockwise direction in FIG. ,
Wear is promoted from the edge at the axial end.

In order to prevent this, as shown in FIG. 15, there is also an example in which a chamfered slope 108 is formed on the outer peripheral edge of the piston bottom portion of the single-headed piston 110 to reduce friction on the outer peripheral edge. Are known.

[0008]

In the conventional one-sided swash plate type compressor having the above-mentioned structure, the rotation preventing portion of the piston and the inner wall of the front housing prevent the rotation. , Heat is generated due to friction. However, the removal of heat generated by this friction is insufficient because the heat dissipation area is narrow only by chamfering the outer peripheral edge of the bottom of the piston.

Moreover, the heat generated from the sliding contact portion expands the rotation preventing portion, further increases the frictional force, and further increases the heat generation. In addition, heat is generated between the shoe holding portion of the piston and the shoe due to the sliding movement of the shoe.

Therefore, as described above, a technical object of the present invention is to provide a piston having a mechanism for reducing heat generated by contact between two parts such as a piston and a shoe or a piston and an inner wall surface of a housing. An object of the present invention is to provide a one-sided swash plate type compressor that can reduce the temperature of the entire compressor by reducing heat generation and can improve the life of the compressor.

Another technical problem of the present invention is
By guiding the oil collected by the heat reduction mechanism to the vicinity of the shoe and the swash plate, the lubricating oil is effectively supplied to improve the durability and the piston and the swash plate compressor using the piston. To provide.

[0012]

According to the present invention, the rotation of the shaft is transmitted to the swash plate via the rotor, and the pair of shoes arranged on both sides of the swash plate is connected to the shoe holding portion of the piston. The rotation of the swash plate is converted into a reciprocating motion of the piston, and the piston reciprocates in the bore formed in the cylinder block to rotate the swash plate. In a piston of a swash plate type compressor, which is blocked by a rotation blocking portion formed on the inner wall surface of the housing and the piston, the piston is provided with a heat dissipation mechanism in the vicinity of having a contact movement. A compressor piston is obtained.

Further, according to the present invention, in the piston of the one-sided swash plate compressor, the heat dissipation mechanism is formed in the vicinity of a contact portion of the rotation blocking portion with the front housing. The piston of the swash plate type compressor is obtained.

Further, according to the present invention, in the piston of the swash plate type compressor, there is obtained the piston of the swash plate type compressor, wherein the heat dissipation mechanism is formed in a plane area of the end face of the piston bottom portion.

Further, according to the present invention, in the piston of the swash plate type compressor, the heat radiating mechanism has a stepwise shape, and the piston of the swash plate type compressor is obtained.

Further, according to the present invention, in the piston of the swash plate type compressor, the heat radiating mechanism has a fin shape, and the piston of the swash plate type compressor is obtained.

Further, according to the present invention, in the piston of any one of the swash plate type compressors described above, a lubricating groove is formed in the shoe holding portion of the piston from the heat dissipation mechanism. The piston of is obtained.

Further, according to the present invention, there is provided a swash plate type compressor including the piston of any one of the swash plate type compressors.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a swash plate compressor according to an embodiment of the present invention. Referring to FIG. 1, a swash plate compressor according to an embodiment of the present invention is called a swash plate compressor. One-sided swash plate compressor 5
0 is a front housing 51 and a rear housing 52
And a cylinder block 53 interposed therebetween. A shaft 54 is provided between a cylindrical boss portion 51a of the front housing 51 that axially protrudes and a central bearing hole 53a of the cylinder block 53. The shaft 54 is formed by bearings 55a and 55b. Both ends are rotatably supported by the portion 51a and the bearing hole 53a.

A rotor 56 is provided near the end inner wall 51b of the front housing 51 of the shaft 54. Further, a swash plate 58 is provided around the shaft 54 near the center of the rotor 56.

Further, a ring 54a for defining the minimum inclination angle of the swash plate 58 is provided closer to the cylinder block 53 than the swash plate 58 of the shaft 54. One end side of the shaft 54 of the rotor 56 in the central axis direction is supported by the inner wall 51b of the front housing 51 via a thrust bearing 57. On the other hand, a ring-shaped protrusion 56a is provided at the other end of the rotor 56, and the protrusion 58a provided on the swash plate 58 is inserted into this ring so that the ring can move in the insertion direction. In the rotational direction, a hinge mechanism that is locked and immovably coupled is configured.
Reference numeral 58c is a stopper.

The cylinder block 53 is a cylinder bore 53b provided concentrically around the central bearing hole 53a at equal angular intervals and extending along the length of the shaft.
have. A valve plate device 59 including a suction valve 59a and a discharge valve 59b is provided between the cylinder block 53 and the rear housing 52.

Inside the rear housing 52, a suction chamber 52a for sucking the fluid to be compressed from the external refrigerant circuit through the suction port 52c, and the compressed fluid are discharged to the external refrigerant circuit through the discharge port 52d. The discharge chamber 52b is defined. The suction chamber 52a and the hole 53a communicate with each other through a communication passage 64 made of a thin tube. Further, the rear housing 52 is provided with an electromagnetically driven capacity control valve, and a capacity control mechanism 60 for controlling the compression capacity of this compressor is provided. Although the inlet control type external control valve is shown as the capacity control valve here, it may be an internal control type, an outlet control type, or a fixed capacity type swash plate type compressor. The capacity control mechanism 60 is connected to a communication passage 63 that communicates with the discharge chamber 52b, a communication passage 62 that communicates with a crank chamber 61 defined by the front housing 51 and the cylinder block 53, and the crank chamber 61. The pressure in the crank chamber 61 is adjusted by connecting or disconnecting the discharge chamber 52b and the discharge chamber 52b by a capacity control valve.

For example, when the capacity control valve of the capacity control mechanism 60 is closed, the pressure in the crank chamber 61 is reduced to the suction chamber 5
Since only the communication passage 64 communicating with 2a is always open, it becomes low, and the drag force received by the piston 10 becomes small. Therefore, the inclination angle of the swash plate 58 becomes large and the reciprocating distance of the piston becomes large, so the compression capacity is Increase.

On the other hand, when the displacement control valve of the displacement control mechanism 60 is opened, the pressure in the crank chamber 61 increases due to the pressure in the discharge chamber 52b, and the drag force received by the piston 10 increases. The angle of inclination of the piston becomes smaller and the reciprocating distance of the piston 10 becomes smaller, so that the compression capacity decreases.

As described above, the capacity control mechanism 60 adjusts the pressure in the crank chamber 61 by opening and closing the capacity control valve, changes the inclination angle of the swash plate 58, and changes the reciprocating distance of the piston 10. By doing so, the compression capacity is adjusted.

In the cylinder block 53, the piston 1
0 is placed. The piston 10 includes a shoe holding portion 25 that is recessed at the end opposite to the compression side. Inside the shoe holding portion 25, the outer peripheral portion 58b of the swash plate 58 and both end surfaces of the outer peripheral portion have flat surfaces. The shoes 71 and 72 each having a substantially hemispherical shape are housed so that they can come into sliding contact with each other.

In such a swash plate type compressor 50,
When the shaft 54 rotates, the rotor 56 rotates accordingly. Rotation of the rotor 56 depends on the protrusions 56a and 58a.
The swash plate 58 is rotated via the hinge mechanism. Swash plate 58
Is inclined with respect to the shaft 54, the outer peripheral portion 5
8b reciprocates along the central axis of the shaft 54. This reciprocating motion is converted into reciprocating motion in the cylinder bore 53b of the single-headed piston 10 via the shoes 71 and 72 housed in the shoe holding portion 25 of the single-headed piston 10. Therefore, when the single-headed piston 10 moves downward in the cylinder bore 53b in the figure, a fluid containing lubricating oil is sucked into the cylinder bore 53b from the suction chamber 52a through the suction valve 59a, and the single-headed piston 10 moves upward in the figure. Fluid is compressed as it moves to the discharge valve 59.
It is discharged into the discharge chamber 52b via b and is discharged from the discharge port 52d to an external refrigerant circuit (not shown).

The configuration up to this point is almost the same as the prior art.

However, in the present invention, the structure of the single-headed piston is different from the prior art.

FIG. 2 is a view showing a single-headed piston 10 according to the first embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c) is a side view. 2 (a), (b),
Referring to (c), the single-headed piston 10 includes a substantially cylindrical piston body 21 having an end surface, a substantially L-shaped piston neck portion 22 provided at one end of the piston body 21,
The piston bottom part 23 following this is provided.

The piston bottom portion 23 is provided with a rotation preventing portion 24 which is in sliding contact with the housing inner peripheral wall 51c (see FIG. 1) and prevents rotation of the piston in the cylinder bore 53b. Between the piston neck portion 22 and the piston bottom portion 23, a swash plate 58 and a shoe holding portion 25 that is recessed so as to accommodate the hemispherical surfaces of the hemispherical shoes 71 and 72 are provided.
The facing surface of the shoe holding portion 25 is a rounded hollow portion 2
6, 26 are formed respectively.

In the single-headed piston 10 according to the first embodiment of the present invention, the rotation blocking portion 2 of the piston bottom portion 23 is provided.
4, a step-like heat dissipation mechanism 1a is formed which gradually lowers as it moves toward the end. The step portion of the heat dissipation mechanism 1 a is provided with an inner peripheral wall 51 of the front housing 51.
It is formed in an arc shape along c.

With this heat radiation mechanism 1a, the rotation blocking portion 2
It is possible to reduce the heat generated by the swash plate type compressor 50 as a whole by dissipating heat due to friction when the sliding contact of the inner peripheral wall 51 c of the front housing 51 with the inner peripheral wall 51 c.

FIG. 3 is a view showing a single-headed piston 10 'according to a second embodiment of the present invention, (a) being a plan view and (b) being a plan view.
Is a front view and (c) is a side view. Figure 3 (a),
Referring to (b) and (c), a single-headed piston 10 '
Has a substantially cylindrical piston body 21 having an end face, a substantially L-shaped piston neck portion 22 provided at one end of the piston body 21, and a piston bottom portion 23 following the piston neck portion 22.

The piston bottom portion 23 is provided with a rotation blocking portion 24 which is in sliding contact with the housing inner peripheral wall 51c (see FIG. 1) and blocks the rotation of the piston in the cylinder bore 53b. Between the piston neck portion 22 and the piston bottom portion 23, a swash plate 58 and a shoe holding portion 25 that is recessed so as to accommodate the hemispherical surfaces of the hemispherical shoes 71 and 72 are provided.
The facing surface of the shoe holding portion 25 is a rounded hollow portion 2
6, 26 are formed respectively.

In the single-headed piston 10 'according to the second embodiment of the present invention, the rotation preventing portion 24 of the piston bottom portion 23 is provided with the stepwise heat dissipation mechanism 1 which gradually lowers as it moves toward the end portion. Has been done. Each step of the heat dissipation mechanism 1 is formed in an arc shape along the inner peripheral wall 51c of the front housing 51.

With this heat dissipation mechanism 1, the rotation blocking portion 24
Can dissipate heat due to friction when slidingly contacting the inner peripheral wall 51c of the front housing 51 and reduce heat generation of the entire swash plate compressor 50.

FIG. 4 is a view showing a single-headed piston 20 according to a third embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c) is a side view. 4 (a), (b),
Referring to (c) and (c), the single-headed piston 20 is, similar to the single-headed piston 10 according to the first embodiment, a substantially cylindrical piston body 21, a piston neck portion 22 provided at one end of the piston body 21, Piston bottom 2 following this
3 and 3.

The piston bottom portion 23 is provided with a rotation preventing portion 24 which is in sliding contact with the inner peripheral wall 51c of the front housing 51 and prevents the rotation of the single-headed piston 20 in the cylinder bore 53b. Between the piston neck 22 and the piston bottom 23, the swash plate 58 and shoes 71, 72 (see FIG.
The shoe holding portion 25 is provided so as to accommodate the reference shoe). The facing surface of the shoe holding portion 25 is formed with round recesses 26, 26, respectively.

In the single-headed piston 20 according to the third embodiment of the present invention, the rotation blocking portion 2 of the piston bottom portion 23 is provided.
At the center of the outer peripheral surface of 4, there is formed a heat dissipation mechanism 2 having a stepwise shape that gradually lowers as it moves toward the end.

As with the heat dissipation mechanism 1 of the first embodiment, the heat dissipation mechanism 2 dissipates heat due to friction when the rotation blocking portion 24 makes sliding contact with the inner peripheral wall 51c of the front housing 51, and the heat is dissipated. The heat generation of the plate compressor 50 as a whole can be reduced.

FIG. 5 is a diagram showing a single-headed piston 21 according to a fourth embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c) is a side view. 5 (a), (b),
With reference to (c) and (c), the single-headed piston 30 is provided in a substantially cylindrical piston body 21 and one end of the piston body 21 as in the single-headed pistons 10 and 20 according to the first and second embodiments. It has a piston neck 22 and a piston bottom 23 following it.

The piston bottom portion 23 is provided with a rotation blocking portion 24 which is in sliding contact with the inner peripheral wall 51c of the front housing 51 and blocks the rotation of the single-headed piston 30 in the cylinder bore 53b. A shoe holding portion 25 is provided between the piston neck portion 22 and the piston bottom portion 23 so as to accommodate the swash plate 58 and the shoes 71 and 72.
The facing surface of the shoe holding portion 25 is a rounded hollow portion 2
6, 26 are formed respectively.

In the single-headed piston 30 according to the fourth embodiment of the present invention, similarly to the single-headed piston 10 according to the first embodiment, the rotation blocking portion 24 of the piston bottom 23 is provided.
Further, the heat dissipation mechanism 1 is formed in a stepwise shape which gradually lowers as it moves to the end. The heat dissipation mechanism 1 can dissipate heat due to friction when the rotation blocking portion 24 makes sliding contact with the inner peripheral wall 51c of the front housing 51, and reduce heat generation of the one-sided swash plate compressor 50 as a whole.

Further, in the fourth embodiment of the present invention, the lubricating groove 3 is formed which serves as a passage for the lubricating oil from the heat radiation mechanism 1 to the vicinity of the shoe holding portion 25. As a result, since the lubricating oil scraped off by the rotation blocking unit 24 or condensed from the fluid, for example, the refrigerant, is always supplied into the piston shoe holding unit 25, heat generation due to friction from here is reduced. Therefore, heat generation of the entire compressor can be reduced.

6A and 6B are views showing a single-headed piston 31 according to a fifth embodiment of the present invention. FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. 6C is a side view. 6 (a), (b),
Referring to (c), the single-headed piston 31 is the single-headed piston 10, 20, 3 according to the first to fourth embodiments.
Like 0, it has a substantially cylindrical piston body 21, a piston neck portion 22 provided at one end of the piston body 21, and a piston bottom portion 23 following the piston neck portion 22.

The piston bottom portion 23 is provided with a rotation preventing portion 24 which is in sliding contact with the inner peripheral wall 51c of the front housing 51 and prevents rotation of the piston in the cylinder bore. A shoe holding portion 25 is provided between the piston neck portion 22 and the piston bottom portion 23 so as to accommodate the swash plate 58 and the shoes 71 and 72. The facing surface of the shoe holding portion 25 is formed with round recesses 26, 26, respectively.

In the single-headed piston 31 according to the fifth embodiment of the present invention, the rotation blocking portion 2 of the piston bottom portion 23 is provided.
At the central portion of the outer peripheral surface of 4, there is formed a heat dissipation mechanism 4 having a fin structure formed by a plurality of grooves extending in the length direction and arranged side by side in the outer peripheral direction.

The heat dissipation mechanism 4 dissipates heat due to friction when the rotation blocking portion 24 is in sliding contact with the inner peripheral wall 51c of the front housing 51, like the heat dissipation mechanisms 1 and 2 according to the first to fourth embodiments. Thus, the heat generation of the swash plate type compressor 50 as a whole can be reduced.

FIG. 7 is a diagram showing a single-headed piston 32 according to a sixth embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c) is a side view. 7 (a), (b),
With reference to (c) and (c), the single-headed piston 32 is the single-headed piston 10, 20, 3 according to the first to fifth embodiments.
As with 0 and 31, a substantially cylindrical piston body 21 and
Piston neck 22 provided at one end of the piston body 21
And a piston bottom portion 23 following this.

The piston bottom portion 23 is provided with a rotation preventing portion 24 which is in sliding contact with the inner peripheral wall of the housing and prevents rotation of the piston in the cylinder bore. Piston neck 22
And the piston bottom portion 23, a shoe holding portion 25 that is recessed so as to accommodate the swash plate and the shoe is provided. The facing surface of the shoe holding portion 25 has a round recessed portion 26,
26 are formed respectively.

In the fifth embodiment of the present invention, a V-shaped groove extending in the longitudinal direction and gradually expanding in the one end direction is formed in the central portion of the outer peripheral surface of the rotation preventing portion 24 of the piston bottom portion 23 in the outer peripheral direction. The heat dissipation mechanism 5 is formed of a fin structure formed by providing a plurality of side-by-side arrangements.

With this heat dissipation mechanism 5, as with the heat dissipation mechanisms 1, 1a, 2 and 4 of the first to fifth embodiments, the friction when the rotation blocking portion 24 makes sliding contact with the inner peripheral wall 51c of the front housing 51. It is possible to dissipate the heat generated by the above and reduce the heat generation of the entire swash plate compressor.

FIG. 8 is a diagram showing a single-headed piston 33 according to a seventh embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c) is a side view. 8 (a), (b),
Referring to (c) and (c), the single-headed piston 33 includes a substantially cylindrical piston body 21 and a piston neck portion 22 provided at one end of the piston body 21 as in the first to sixth embodiments. , And the piston bottom part 23 following this.

The piston bottom portion 23 is slidably in contact with the inner peripheral wall 51c of the front housing 51, and the cylinder bore 53b.
A rotation blocking portion 24 is provided to block the rotation of the piston body (see FIG. 1). Provided between the piston neck portion 22 and the piston bottom portion 23 is a shoe holding portion 25 which is recessed so as to accommodate the swash plate and the shoe. The facing surface of the shoe holding portion 25 is formed with round recesses 26, 26, respectively.

In the seventh embodiment of the present invention, a plurality of grooves extending in a direction along one diameter, that is, in the vertical direction in the drawing, are provided on the end surface 27 of the piston bottom portion 23 and the rotation preventing portion 24 so as to be aligned in the width direction. The heat dissipation mechanism 6 is formed of a fin structure formed by.

With this heat dissipation mechanism 6, as in the case of the heat dissipation mechanisms 1, 2, 4, 5 of the first to sixth embodiments, the friction when the rotation blocking portion 24 makes sliding contact with the inner peripheral wall 51c of the front housing 51. Dissipates heat generated by the swash plate compressor 5
It is possible to reduce the overall heat generation.

FIG. 9 is a view showing a single-headed piston 34 according to the eighth embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c) is a side view. 9 (a), (b),
Referring to (c) and (c), the single-headed piston 34 includes a substantially cylindrical piston body 21 and a piston neck portion 22 provided at one end of the piston body 21 as in the first to seventh embodiments. , And the piston bottom part 23 following this.

The piston bottom portion 23 is provided with a rotation preventing portion 24 which is in sliding contact with the inner peripheral wall of the housing and prevents rotation of the piston in the cylinder bore. Piston neck 22
And the piston bottom portion 23, a shoe holding portion 25 that is recessed so as to accommodate the swash plate and the shoe is provided. The facing surface of the shoe holding portion 25 has a round recessed portion 26,
26 are formed respectively.

In the eighth embodiment of the present invention, grooves extending in a direction along one diameter, that is, in the figure, in the horizontal direction (width direction) are arranged in the vertical direction on the end surface 27 of the piston bottom portion 23 and the rotation blocking portion 24. A heat dissipation mechanism 7 having a fin structure formed by providing a plurality of fins is formed.

When the rotation preventing portion 24 is slidably brought into contact with the inner peripheral wall 51c of the front housing 51 by the heat dissipating mechanism 7, like the heat dissipating mechanisms 1, 2, 4, 5, 6 according to the first to seventh embodiments. The heat generated by the friction can be dissipated, and the heat generation of the entire swash plate compressor can be reduced.

FIG. 10 is a view showing a single-headed piston 35 according to a ninth embodiment of the present invention, (a) is a plan view and (b) is a plan view.
Is a front view and (c) is a side view. FIG. 9 (a),
Referring to (b) and (c), the single-headed piston 35
Is provided with a substantially cylindrical piston body 21, a piston neck portion 22 provided at one end of the piston body 21, and a piston bottom portion 23 following the piston body portion 22 as in the first to eighth embodiments. There is.

The piston bottom portion 23 is provided with a rotation preventing portion 24 which is in sliding contact with the inner peripheral wall of the housing and prevents rotation of the piston in the cylinder bore. Piston neck 22
And the piston bottom portion 23, a shoe holding portion 25 that is recessed so as to accommodate the swash plate and the shoe is provided. The facing surface of the shoe holding portion 25 has a round recessed portion 26,
26 are formed respectively.

In the single-headed piston 35 according to the ninth embodiment of the present invention, as with the single-headed piston 34 according to the eighth embodiment, the piston bottom portion 23 and the rotation blocking portion 24 are provided.
The end face 27 is provided with a heat dissipation mechanism 8 having a fin structure formed by arranging a plurality of grooves extending in a direction along one diameter, that is, in the drawing, extending in the horizontal direction (width direction) in the vertical direction.

With this heat dissipation mechanism 8, as in the case of the heat dissipation mechanisms 1, 2, 4, 5, 6, 7 according to the first to eighth embodiments, the rotation blocking portion 24 when the single-headed piston 35 reciprocates. Can dissipate heat due to friction when slidingly contacting the inner peripheral wall 51c of the front housing 51 and reduce heat generation of the entire swash plate compressor 50.

Further, in the single-headed piston 35 according to the ninth embodiment of the present invention, the lubricating groove 9 is provided which serves as a passage for lubricating oil from the heat radiation fin to the vicinity of the shoe holding portion 25. As a result, the inside of the shoe holder 25 is always open. Since the lubricating oil that is scraped off by the rotation blocking portion 24 or condensed from the fluid is supplied, the shoe holding portion 2
The heat generation due to friction from inside 5 can be reduced, and the heat generation of the swash plate type compressor 50 as a whole can be reduced.

FIG. 11 is a view showing a single-headed piston 36 according to the tenth embodiment of the present invention, (a) is a plan view,
(B) is a front view and (c) is a side view. FIG. 9 (a),
Referring to (b) and (c), the single-headed piston 36
Is a single-headed piston 1 according to the first to ninth embodiments.
Like 0, 20, 30 to 35, it has a substantially cylindrical piston body 21, a piston neck portion 22 provided at one end of the piston body 21, and a piston bottom portion 23 following the piston neck portion 22.

The piston bottom portion 23 is provided with a rotation preventing portion 24 which is in sliding contact with the inner peripheral wall of the housing and prevents rotation of the piston in the cylinder bore. Piston neck 22
And the piston bottom portion 23, a shoe holding portion 25 that is recessed so as to accommodate the swash plate and the shoe is provided. The facing surface of the shoe holding portion 25 has a round recessed portion 26,
26 are formed respectively.

In the tenth embodiment of the present invention,
On the end surface 27 of the piston bottom portion 23 and the rotation blocking portion 24, there is formed the heat dissipation mechanism 11 having a fin structure formed by arranging a plurality of grooves, which are cut in a V shape in a diagonal direction from the left and right. ing.

With this heat dissipation mechanism 11, the first through ninth
According to the embodiment of the heat dissipation mechanism 1, 2, 4, 5, 6, 7,
As in the case of FIG.
It is possible to dissipate heat due to friction when slidingly contacting the inner peripheral wall of the, and reduce heat generation of the entire swash plate compressor 50.

FIG. 12 is a view showing a single-headed piston 37 according to an eleventh embodiment of the present invention, (a) is a plan view,
(B) is a front view and (c) is a side view. FIG. 9 (a),
Referring to (b) and (c), the single-headed piston 37
Like the single-headed piston according to the first to tenth embodiments, includes a substantially cylindrical piston body 21, a piston neck portion 22 provided at one end of the piston body 21, and a piston bottom portion 23 following the piston neck portion 22. ing.

The piston bottom portion 23 is provided with a rotation preventing portion 24 which is in sliding contact with the inner peripheral wall 51c of the front housing 51 and prevents rotation of the piston in the cylinder bore. Between the piston neck portion 22 and the piston bottom portion 23, there is a shoe holding portion 25 which is recessed so as to accommodate the swash plate and the shoe.
Is provided. The facing surface of the shoe holding portion 25 is formed with round recesses 26, 26, respectively.

In the single-headed piston 37 according to the eleventh embodiment of the present invention, the heat dissipation mechanism 12 having a fin structure in which a plurality of projections projecting in the axial direction of the end faces of the piston bottom portion 23 and the rotation blocking portion 24 are arranged vertically and horizontally is formed. Has been done.

By the heat dissipation mechanism 12, the first to the first
0 heat dissipation mechanism 1, 2, 4, 5, 6,
Similar to 7, 8, and 11, the heat due to the friction when the rotation blocking portion 24 makes sliding contact with the inner peripheral wall 51c of the front housing 51 is dissipated, and the heat generation of the entire swash plate compressor can be reduced.

FIG. 13 is a view showing a single-headed piston 38 according to the twelfth embodiment of the present invention, (a) is a plan view,
(B) is a front view and (c) is a side view. FIG.
Referring to (a), (b), and (c), the single-headed piston 38 has a substantially cylindrical piston body similar to the single-headed pistons 10, 20, 30 to 37 according to the first to eleventh embodiments. 21, a piston neck portion 22 provided at one end of the piston main body 21, and a piston bottom portion 23 following the piston neck portion 22.

The piston bottom portion 23 is provided with a rotation preventing portion 24 which is in sliding contact with the inner peripheral wall 51c of the front housing 51 and prevents rotation of the piston body 21 in the cylinder bore. A shoe holding portion 25 is provided between the piston neck portion 22 and the piston bottom portion 23 so as to accommodate the swash plate 58 and the shoes 71 and 72. The facing surface of the shoe holding portion 25 is formed with round recesses 26, 26, respectively.

In the single-headed piston 38 according to the twelfth embodiment of the present invention, similarly to the single-headed piston 37 according to the eleventh embodiment, the projections projecting in the axial direction of the end faces of the piston bottom portion 23 and the rotation blocking portion 24 are provided. The heat dissipation mechanism 12 is formed of a fin structure that is arranged vertically and horizontally.

The heat radiating mechanism 12 dissipates heat due to friction when the rotation preventing portion 24 makes sliding contact with the inner peripheral wall of the front housing 51, similarly to the heat radiating mechanism according to the eleventh embodiment, so that the swash plate type compression is performed. The heat generation of the entire machine 50 can be reduced.

Furthermore, in the single-headed piston 38 according to the twelfth embodiment of the present invention, the lubricating groove 1 serving as a passage for the lubricating oil communicating from the radiating fins to the vicinity of the shoe holding portion 25.
3 is provided. As a result, the shoe holder 25
Since lubricating oil is constantly supplied to the inside, heat generation due to friction from here can be reduced, and heat generation of the entire swash plate type compressor 50 can be reduced.

[0081]

As described above, according to the present invention, the heat generation due to the reciprocating motion of the piston and the contact with the inner wall surface of the front housing due to the rotation prevention is reduced by the heat dissipation groove structure.
Forcibly, the temperature of the entire compressor is reduced, and the durability of the compressor can be improved.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a single-headed piston 10 according to a first embodiment of the present invention, (a) is a plan view, (b) is a front view,
(C) is a side view.

FIG. 3 is a diagram showing a single-headed piston 10 'according to a second embodiment of the present invention, (a) is a plan view, (b) is a front view,
(C) is a side view.

FIG. 4 is a diagram showing a single-headed piston 20 according to a third embodiment of the present invention, (a) is a plan view, (b) is a front view,
(C) is a side view.

FIG. 5 is a view showing a single-headed piston 30 according to a fourth embodiment of the present invention, (a) is a plan view, (b) is a front view,
(C) is a side view.

FIG. 6 is a view showing a single-headed piston 31 according to a fifth embodiment of the present invention, (a) is a plan view, (b) is a front view,
(C) is a side view.

FIG. 7 is a view showing a single-headed piston 32 according to a sixth embodiment of the present invention, (a) is a plan view, (b) is a front view,
(C) is a side view.

FIG. 8 is a diagram showing a single-headed piston 33 according to a seventh embodiment of the present invention, (a) is a plan view, (b) is a front view,
(C) is a side view.

FIG. 9 is a view showing a single-headed piston according to an eighth embodiment of the present invention, (a) is a plan view, (b) is a front view,
(C) is a side view.

FIG. 10 is a view showing a single-headed piston 35 according to a ninth embodiment of the present invention, (a) is a plan view, (b) is a front view,
(C) is a side view.

FIG. 11 is a view showing a single-headed piston according to a tenth embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c) is a side view.

FIG. 12 is a diagram showing a single-headed piston 37 according to an eleventh embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c) is a side view.

FIG. 13 is a diagram showing a single-headed piston according to a twelfth embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c) is a side view.

FIG. 14 is a diagram showing an example of a single-headed piston according to a conventional technique, (a) is a plan view, (b) is a front view, and (c) is a side view.

15A and 15B are views showing another example of a single-headed piston according to the prior art, FIG. 15A is a plan view, FIG. 15B is a front view, and FIG. 15C is a side view.

[Explanation of symbols]

1,1a, 2,4,5,6,7,8,11,12 Heat dissipation mechanism 3,9,13 Lubrication groove 10,10 ', 20,30,31,32,33,34,
35, 36, 37, 38 Single-headed piston 21 Piston body 22 Piston neck 23 Piston bottom 24 Rotation blocking part 25 Shoe holding part 26 Recessed part 50 Swash plate type compressor 51 Front housing 51a Boss 51b Inner wall 52 Rear housing 52a Suction chamber 52b Discharge chamber 53 Cylinder block 53a Bearing hole 53b Cylinder bore 54 Shaft 54a Rings 55a, 55b Bearing 56 Rotor 56a Projected portion 57 Thrust bearing 58 Swash plate 58a Projected portion 58b Outer peripheral portion 58c Stopper 59 Valve plate device 59a Intake valve 59b Discharge valve 60 Capacity control Mechanism 61 Crank chambers 62, 63, 64 Communication passages 71, 72 Shoe 100 Single-headed piston 101 Piston body 102 Piston neck 103 Piston bottom 104 Rotation blocking part 105 Shoe holding part 106 Dimple

Claims (7)

[Claims] 1. The rotation of a shaft is transmitted to a swash plate via a rotor, and a pair of shoes arranged on both sides of the swash plate are held by shoe holding portions of the piston, and the rotation of the swash plate is transmitted to the piston. The piston is reciprocally moved in the bore formed in the cylinder block and the rotation of the piston generated by the rotation of the swash plate is formed on the inner wall surface of the front housing of the compressor and the piston. In the piston of the swash plate compressor, the piston is provided with a heat dissipation mechanism in the vicinity of the contact movement, the piston being blocked by the rotation blocking portion. 2. The piston of the swash plate compressor according to claim 1, wherein the heat dissipation mechanism is formed in the vicinity of a contact portion of the rotation blocking portion with the front housing. The compressor piston. 3. The piston of the swash plate type compressor according to claim 2, wherein the heat dissipation mechanism is formed in a plane area of an end surface of a bottom portion of the piston. 4. The piston of the swash plate compressor according to claim 2, wherein the heat dissipation mechanism has a stepwise shape. 5. The piston of a swash plate compressor according to claim 2, wherein the heat dissipation mechanism has a fin shape. 6. The piston of the swash plate compressor according to claim 2, wherein a lubricating groove is formed in the shoe holding portion of the piston from the heat dissipation mechanism. Piston of swash plate type compressor. 7. A swash plate compressor, comprising the piston of the swash plate compressor according to claim 1. Description: