JPH06317252A - Swash plate type compressor - Google Patents

Abstract

PURPOSE:To provide a swash plate type compressor which can be manufactured easily in simple constitution and has a rotation preventive mechanism for a piston. CONSTITUTION:A swash plate system compressor has a rotation preventive mechanism. The rotation preventive mechanism has a pair of semicircular groove 1 and groove 2 and a rotation locking ball 3. The groove 1 is formed in a part of a piston 57. The semicicrcular groove 2 is formed in a part of a housing 51 opposed to the semicircular groove 1 of the piston when the piston 57 makes reciprocating motion. The rotation locking ball 3 is inserted in space formed of these both grooves 1 and 2, and prevents relative rotation of the piston 57 and the housing 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor used in, for example, a refrigerating circuit of an air conditioner for a vehicle.
The present invention relates to a swash plate type compressor including a swash plate that swings in the axial direction according to the rotation of a rotating shaft inside a housing.

[0002]

2. Description of the Related Art Conventionally, as a compressor for a refrigeration circuit, a double swash plate type compressor, a swash plate type compressor, a scroll type compressor, a vane rotary type compressor and the like are known.

As a swash plate type compressor, a full-scale shokai 63-93
The one disclosed in Japanese Patent Publication No. 480 is known. The outer shell of this type of compressor is formed by a housing.
A plurality of cylinder spaces are provided in the housing, and a piston is slidably arranged in the spaces. The shaft is rotatably supported by the housing. A swash plate is engaged with this shaft and rotates integrally with the shaft. The swinging motion of the swash plate is transmitted to the piston via the shoe.

Here, in order to prevent the piston from rotating in the cylinder bore due to the swinging motion of the swash plate,
At the center of the outer peripheral surface of the piston, a plate body protruding toward both sides of the shaft is provided, while at the cylinder, a groove for engaging with the plate body is provided.

[0005]

However, since the sliding motion is performed between the plate body of the piston and the groove of the housing, it is necessary to perform precise machining of both, particularly machining of the cylinder in which the piston is accommodated. However, it has the drawback of being difficult to process, spending control time, and consequently increasing the cost of the compressor.

Therefore, a technical object of the present invention is to provide a swash plate type compressor having a piston rotation preventing mechanism which can be easily manufactured with a simple structure.

[0007]

According to the present invention, a housing having a plurality of cylinders, a piston slidably accommodated in the cylinder, a shaft rotatably supported by the housing, and A swash plate that is inclinedly engaged with the shaft and rotates integrally with the shaft, a shoe that transmits the swinging motion of the swash plate to the piston, and a rotation prevention mechanism that prevents the piston from rotating in the cylinder. In the swash plate compressor, the rotation prevention mechanism includes a first recess formed in a part of the piston, and a reciprocating motion of the piston formed in a part of the housing facing the first recess. Sometimes inserted into the space formed by the second recessed portion facing the first recessed portion and the first and second recessed portions, the phase of the piston and the housing Swash plate type compressor is obtained which is characterized in that a rotation locking member for locking the rotation.

According to the present invention, the first and second recesses each have a semicircular cross section orthogonal to the moving direction of the piston, and when combined with each other, form a space having a circular cross section. A swash plate compressor is obtained.

According to the present invention, it is possible to obtain a swash plate compressor in which at least one of the first and second recesses is hemispherical.

Here, in the present invention, it is preferable that the rotation locking member is a ball or a roller.

[0011]

With the rotation locking member interposed in the semicircular groove formed in the piston and the housing, the rotational force of the piston can be prevented from being received by the housing via the rotation locking member.

[0012]

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

FIG. 1 is a sectional view showing a swash plate type compressor according to an embodiment of the present invention. As shown in FIG. 1, the front cylinder block 51 and the rear cylinder block 52
Contact each other in the axial direction and form a crank chamber 53 inside. In the crank chamber 53, a swash plate 55 connected to the rotating shaft 54 is arranged. Inside the front cylinder block 51 and the rear cylinder block 52,
Around the crank chamber 53, a plurality of cylinder bores 56 parallel to the rotary shaft 54 surround the rotary shaft 54 so that the front cylinder block 51 and the rear cylinder block 52 are
And a piston 57 is slidably disposed in each of these cylinder bores 56. Piston 5
The peripheral portion of the swash plate 55 is accommodated in the recess 58 provided in the No. 7 together with the shoes 59, 59 provided on both end surfaces. The thrust bearings 61, 6 are formed on both end faces of the center of the swash plate 55.
It is slidably supported by the sleeve members 63 and 64 via 2. Front cylinder block 51
A front cylinder head 66 is joined to the open end of the through a valve plate device 65. At the opening end of the rear housing 52, the rear cylinder head 6 is inserted through the valve plate device 67.
8 abuts.

The front cylinder head 66 is provided with a discharge chamber 71 and a suction chamber 72. On the other hand, the rear cylinder head 68 is provided with a discharge chamber 73 and a suction chamber 74. In the compressor having such a configuration, when the rotating shaft rotates, the piston 57 reciprocates by an amount corresponding to the inclination angle of the swash plate 55. Here, the refrigerant moves from the position of the piston 57 in FIG. 1 to the right, and the refrigerant is sucked from the suction chamber 72 into the cylinder bore 56 on the left side of the piston.
The refrigerant on the right side of the piston 57 is compressed and discharged into the discharge chamber 73. Further, when the swash plate rotates, the piston 57
Moves to the left, and the refrigerant in the cylinder bore 56 to the left of the piston is compressed and discharged into the discharge chamber 71 via the valve plate device. The above operation is repeated.

In the swash plate type compressor according to the first embodiment, a groove 1 is provided as a first recess on the outer side of the piston 57, slightly closer to one end than the center, while the upper end of the cylinder bore 56 of the front cylinder block 51 is provided. A groove 2 is provided as a second recessed portion at a position corresponding to the groove 1. Also, groove 1
The rotation locking ball 3 is inserted in the space formed by 2 and 2 and constitutes a rotation preventing mechanism.

FIG. 2 is a sectional view of the swash plate compressor of FIG. 1 taken along the line AA ', and FIG. 3 is a perspective view showing the piston of FIG. As shown in FIGS. 2 and 3, the grooves 1 and 2 each have a semicircular shape, and also have a circular shape with a gap left on the joint surface. In the compressor according to the first embodiment having such a configuration, the piston 57 slides in the cylinder bore 56 by the rotation of the rotating swash plate 55. At this time, as the piston 57 slides, the piston 57 receives a force for rotating in the cylinder bore 56 from the swash plate 55 and the like. The engagement with the groove 1 prevents rotation.

FIG. 4 is a sectional view showing a swash plate type compressor according to the second embodiment, and FIG. 5 is a sectional view taken along the line BB 'of FIG. It has the same structure as the compressor according to the first embodiment shown in FIG. 1 except that the rotation preventing mechanism is different.

As shown in FIG. 4, at the upper end of the opening of the cylinder bore 56 of the front cylinder block 51 of the swash plate type compressor according to the second embodiment, a ball accommodating portion is formed as a second recessed portion for accommodating the rotation locking ball 3. The hole 5 is formed. As shown in FIG. 5, the ball receiving hole 5 is provided with
Is a hole having a semicircular cross-section that can accommodate Also,
The piston has a shape similar to that shown in FIG. In the compressor according to the second embodiment having such a configuration, the piston 57 slides in the cylinder bore 56 by the rotation of the rotating swash plate. At this time, as the piston 57 slides, the piston 57 receives a force to rotate in the cylinder bore 56, but the rotation-preventing ball 3 fixed in the ball accommodating hole 5 and the groove 1 of the piston 57 are engaged with each other. Prevents rotation.

FIG. 6 is a sectional view showing a swash plate compressor according to the third embodiment. FIG. 7 is a sectional view taken along the line CC ′ of FIG. The difference from the first embodiment is that the groove 1 of the piston 57 is
And in the space formed by the groove 2 of the cylinder block 51,
Instead of the rotation locking ball 3, a cylindrical rotation locking roller 7
Is a point having.

As shown in FIG. 7, the semicircular groove 1 and groove 2
A cylindrical rotation locking roller 7 is inserted into a space having a circular cross section with a slight gap left at the joint formed by. In the compressor according to the third embodiment having such a configuration, the piston 57 slides in the cylinder bore 56 by the rotation of the rotating swash plate. At this time, the piston 57 receives a force to rotate in the cylinder bore 56 as the piston 57 slides, but the rotation is prevented by the engagement of the rotation locking roller 7 and the groove 1 of the piston 57. The vibration of the piston 57 in the direction perpendicular to the axial direction can also be suppressed.

[0021]

As described above, according to the present invention, by using a ball as a rotation locking member, a highly efficient compressor that can roll with respect to reciprocating operation of a piston and has little power loss. Is obtained.

Further, according to the present invention, by using a cylindrical roller as the rotation locking member, a large contact area can be obtained and wear resistance can be improved.

Further, according to the present invention, the rotary locking member is
Standard parts can be used for both balls and cylindrical rollers, and they can be obtained at low cost.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view taken along the line AA ′ of the swash plate compressor shown in FIG.

3 is a perspective view showing the piston of FIG. 1. FIG.

FIG. 4 is a cross-sectional view showing a swash plate compressor according to a second embodiment.

5 is a cross-sectional view taken along the line BB ′ of the swash plate compressor shown in FIG.

FIG. 6 is a cross-sectional view showing a swash plate compressor according to a third embodiment.

FIG. 7 is a sectional view taken along line CC ′ of the swash plate compressor shown in FIG.

[Explanation of reference symbols] 1, 2 groove 3 rotation locking ball 5 ball receiving hole 7 rotation locking roller 51 front cylinder block 52 rear cylinder block 56 cylinder bore 57 piston 55 swash plate

Claims (5)

[Claims] 1. A housing having a plurality of cylinders,
A piston slidably accommodated in the cylinder; a shaft rotatably supported by the housing; a swash plate that is inclinedly engaged with the shaft and rotates integrally with the shaft; In a swash plate compressor including a shoe that transmits a swinging motion to the piston and a rotation prevention mechanism that prevents rotation of the piston in the cylinder, the rotation prevention mechanism is formed in a part of the piston. A first hollow portion, a second hollow portion formed in a part of the housing facing the first hollow portion and facing the first hollow portion when the piston reciprocates, and the first and second hollow portions. A swash plate type compressor, comprising: a rotation locking member that is inserted into a space formed by the recessed portion and locks relative rotation between the piston and the housing. 2. The first and second recesses each have a semicircular cross section orthogonal to the moving direction of the piston,
The swash plate compressor according to claim 1, wherein the swash plate compressor forms a space having a circular cross-section when they are fitted together. 3. The method according to claim 1, wherein at least one of the first and second recesses has a hemispherical shape.
The swash plate compressor described. 4. The swash plate type compressor according to claim 1, wherein the rotation locking member is a ball. 5. The swash plate compressor according to claim 1, wherein the rotation locking member is a roller.