JP2008184933A - Swash plate compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress vibrations developed in a swash plate and rotor resulting from compression reaction force which the swash plate receives from a piston without expanding the gap in a load receiving part on the top dead center side. <P>SOLUTION: A swash plate compressor is equipped with a swash plate and a rotor for supporting the swash plate, which includes in a compression area a first load receiving part which is a load receiving part keeping the rotor supporting the swash plate on the surface and which is situated closer to the rotor side than to an intersection point of the swash plate and the drive shaft thereof when a surface on a swash plate side of the rotor is partitioned into a compression area of an area on a compression process side and a suction area of an area on a suction process side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a swash plate compressor, and more particularly, to a technique for suppressing vibrations that occur when the inclination angle of a swash plate is maximized in a swash plate variable capacity compressor.

  As shown in FIG. 4, in the swash plate compressor, when the rotor 72 and the swash plate 73 are rotated by the drive shaft 71, the piston connected to the swash plate 73 via the shoe reciprocates in the cylinder. Perform fluid compression. At this time, a compression reaction force is generated in the piston in the compression process among the pistons connected to the swash plate 73, and as a result, a resultant force 11 of the compression reaction force of the piston in the compression process is applied to the swash plate 73.

  The compression reaction force resultant force 11 is applied to a position deviated from the center of the swash plate, and acts as an offset load on the swash plate. Moreover, the compression reaction force resultant force 11 does not stay at one point on the swash plate 73 but draws a locus 74 on the swash plate 73 according to the rotation of the swash plate 73 according to simulations and experiments by the inventors. confirmed. Hereinafter, this locus 74 is referred to as a reaction force locus. Since the compression reaction force resultant force 11 is an offset load, it contributes to the vibration of the swash plate. In order to suppress this vibration, the position where the rotor receives the load from the swash plate, that is, the positional relationship between the load receiving portion and the reaction force locus 27 is important.

  The rotor surface on the swash plate side is divided into a semicircle on the compression process side and a semicircle on the suction process side, which are referred to as a compression area and a suction area, respectively. Further, the same plane is divided into a semicircle on the top dead center side and a semicircle on the bottom dead center side, which are referred to as a top dead center side region and a bottom dead center side region, respectively. Further, each of the compression region and the suction region is divided into a top dead center side and a bottom dead center side, and a top dead center side compression region 16, a bottom dead center side compression region 17, a bottom dead center side suction region 18, It is assumed that the whole is divided into four areas of the dead point side inhalation area 19.

  At this time, as shown in FIG. 5, the conventional swash plate type variable displacement compressor has a total of three load receiving portions, two at the top dead center side region and one at the bottom dead center side region. . Each of the load receiving portions in the top dead center side region is a connection portion to the rotor of the link mechanism that connects the swash plate and the rotor, and each of the load receiving portions is 1 in the top dead center side compression region 16 and the top dead center side suction region 19. Each portion is positioned substantially symmetrically with respect to the boundary line between the compression area and the suction area, while the load receiving portion of the bottom dead center side area is on the boundary line between the bottom dead center side compression area 17 and the bottom dead center side suction area 18. When these load receiving portions are connected by a straight line, an isosceles triangle 74 symmetrical with respect to the boundary line between the compression region and the suction region is drawn. Hereinafter, a triangle drawn by connecting the load receiving portions with straight lines is referred to as a load receiving portion triangle.

  On the other hand, it has been found by the inventors' simulation that the reaction force locus 27 draws an elliptical orbit near the load receiving portion of the top dead center compression region 16. Looking at the positional relationship between the load receiving portion triangle and the reaction force locus 27, it can be seen that in the figure, the almost right half of the reaction force locus 27 is included in the load receiving portion triangle, but the left half is not included. When the compression reaction force resultant force 11 is applied to the inside of the load receiving portion triangle, the force in the direction of pressing the swash plate against the rotor acts on all three load receiving portions, and the rotor stably receives the compression reaction force resultant force. However, when applied to the outside as shown in the figure, a force acts in the direction of pulling the swash plate away from the rotor at the load receiving portion in the top dead center side suction region, and as a result, the rotor stabilizes the compression reaction force resultant force. I can not take it. For this reason, in response to rotation, the load increase at the load receiving portion and the direction of the load reaction force resultant force are caused. This causes deterioration of controllability due to increased friction at the load receiving portion, and replacement of the contact position between parts. It was the cause of vibration.

  In order to prevent the compression reaction force from acting on the outside of the load receiving portion triangle, conventionally, by increasing the distance between the two load receiving portions on the top dead center side, the area of the load receiving portion triangle is increased, and the reaction force I was trying to keep track of it. However, there are cases where the interval cannot be increased due to reasons such as design restrictions. In such a case, the reaction force trajectory is drawn from the outside of the load receiving triangle or from the inside to the outside. Could not be solved.

  In order to provide a swash plate of a variable capacity swash plate type compressor in which transmission of vibration due to piston reciprocation from the swash plate to the rotor is suppressed, a swash plate body, a swash plate boss integrally formed with a swing arm, and The swash plate fixing ring, the swash plate boss and the swash plate fixing ring sandwiching the swash plate main body, and the three members are fixed together, and the vibration is suppressed between the swash plate main body and the swash plate boss. A technique in which a material is inserted is described in Patent Document 1.

JP 2005-220859 A

  The present invention has been made in view of such a situation, and the problem to be solved by the present invention is that the compression reaction force received by the swash plate from the piston without increasing the interval between the load receiving portions on the top dead center side. The present invention provides a technique for suppressing vibration generated in a swash plate and a rotor due to a resultant force.

  In order to solve the above-described problems, the present invention provides the following swash plate compressor. That is, the present invention relates to a swash plate compressor including a swash plate, a rotor that supports the swash plate, and a drive shaft that supports the rotor, and the surface on the swash plate side of the rotor is compressed as an area on the compression process side. When the area is divided into the suction area, which is the area on the suction process side, the rotor is a load receiving portion that supports the swash plate on the surface, and the first is located on the rotor side from the intersection of the swash plate and its drive shaft. A swash plate type compressor having a load receiving portion in a compression region is provided.

  In particular, it is desirable to have the first load receiving portion in a region other than the boundary line between the compression region and the suction region in the compression region.

  More specifically, the compression area is divided into a top dead center side compression area that is a top dead center side area and a bottom dead center side compression area that is a bottom dead center side area, and the inhalation area is divided into a top dead center area. When the vehicle is divided into a top dead center side suction region that is a side region and a bottom dead center side suction region that is a region on the bottom dead center side, the first load receiving portion is included in the bottom dead center side compression region. .

  It is particularly effective to dispose the first load receiving portion so as to contact the boundary line between the bottom dead center compression region and the top dead center compression region.

  Typically, the rotor has a second load receiving portion that supports the swash plate on the surface in a top dead center side compression region, and the rotor includes a third load receiving portion that supports the swash plate on the surface. It is conceivable to have the top dead center side inhalation area.

  A convex portion corresponding to the first load receiving portion may be provided on the swash plate, or may be provided on the rotor.

  In the case of a variable capacity swash plate compressor, the swash plate and the rotor are connected by two sets of link mechanisms, one of the two sets of link mechanisms being arranged in the top dead center compression region and the other in the top dead center suction region. It is conceivable that the first load receiving portion arranged is a swash plate deformation angle limiting portion that limits the inclination angle of the swash plate.

  At this time, each of the two sets of link mechanisms includes a swash plate arm connected to the swash plate and a rotor arm connected to the rotor, and the rotor arm is outside the swash plate arm. Alternatively, each of the two sets of link mechanisms may include a swash plate arm connected to the swash plate and a rotor arm connected to the rotor, and the rotor arm may be a swash plate. It may be inside the arm.

  The present invention also relates to a swash plate compressor including a drive shaft, a rotor supported by the drive shaft, and a swash plate that is supported at an eccentric position of the rotor with an inclination angle variably with respect to the drive shaft. A swash plate type compressor is provided in which a swash plate deformation angle limiting portion for limiting the inclination angle is provided at a position corresponding to a region on the rotor compression process side.

  According to the present invention, by providing the first load receiving portion in the bottom dead center compression region, the reaction force trajectory is formed in the polygon formed by the first load receiving portion and the other load receiving portion. As a result, the vibration of the swash plate generated by the compression reaction force can be suppressed.

  A swash plate type variable displacement compressor 1 according to an embodiment of the present invention will be described with reference to FIG. In the swash plate type variable capacity compressor 1, when the drive shaft 2 is rotated by the force of a motor or the like, the rotor 3 rotates in the rotation direction R. The rotation of the rotor 3 is transmitted to the swash plate 7 through a link mechanism including the rotor arm 4, the pin 5, and the swash plate arm 6. The swash plate 7 is interlocked with the piston 9 via the shoe 8, whereby the piston 9 reciprocates in the cylinder 10 and compresses the fluid in the cylinder. Although not shown, seven pistons 9 are connected around the swash plate 7.

  FIG. 2 is an enlarged view of the rotor 3 and the swash plate 7 of FIG. When the drive shaft 2 rotates, the rotor 3 and the swash plate 7 rotate accordingly, and the seven pistons 9 reciprocate to compress the fluid. At this time, the piston 9 in the compression process receives a compression reaction force from the fluid. The magnitude of the compression reaction force of the piston 9 gradually increases from the bottom dead center and becomes maximum at the top dead center. Therefore, the position where the resultant force 11 of the compression reaction force by the piston in the compression process is applied to the swash plate 7 is on the top dead center side of the compression process as shown in FIG.

  FIG. 3 shows a view from the right side of FIG. For convenience of explanation, the rotor 3 is omitted. On the surface of the swash plate 7 on the rotor 3 side (hereinafter referred to as the back surface of the swash plate), a straight line connecting the top dead center 12 and the bottom dead center 13 is a straight line 14, and a straight line orthogonal to the straight line 14 is the straight line 15 is assumed. The back surface of the swash plate is divided into four areas, a top dead center side compression area 16, a bottom dead center side compression area 17, a bottom dead center side suction area 18, and a top dead center side suction area 19 by straight lines 14 and 15.

  At this time, the top dead center side compression region 16 and the top dead center side suction region 19 have load receiving portions 20 and 21 on the top dead center side, respectively. Each of the load receiving portions 20 and 21 is considered to be at the midpoint of a line segment passing through the rotor arm 4 in the center line 22 of the pin 5.

  A counterweight 23 is formed from the bottom dead center compression region 17 to the bottom dead center suction region 18 on the rear surface of the swash plate. The portion in contact with the straight line 15 on the counterweight 23 has a swash plate deformation angle limiting portion 24 that is a convex portion that limits the angle of the swash plate 7 by contacting the rotor 3 when the swash plate 7 is inclined to the maximum. . When the swash plate 7 has the maximum inclination, the swash plate deformation limiter 24 comes into contact with the rotor 3 and becomes the load receiving portion 25.

  Conventionally, the load receiving portion on the bottom dead center side is provided near the bottom dead center 13, but in the present invention, the load receiving portion 25 is provided at a position shifted to the compression process side. Thereby, compared with the conventional load receiving part triangle, in the load receiving part triangle 26 consisting of the load receiving parts 20, 21 and 25, the angle of the angle with the load receiving part 20 of the top dead center side compression region as the apex is increased. As a result, the entire reaction force locus 27 can be accommodated in the load receiving portion triangle 26.

  In the above-described embodiment, the number of pistons has been described as seven. However, the present invention is not limited to this and may have a smaller or larger number of pistons. Since the reaction force trajectory increases as the number of pistons decreases, the present invention is particularly suitable for a swash plate compressor having a small number of pistons. Moreover, although it demonstrated as having three load receiving parts, a load receiving part is further added to these three load receiving parts, and a load receiving part comprises n square (n is an integer greater than or equal to 4). It is good.

  The present invention can be applied to a swash plate type compressor. It is particularly suitable for a swash plate type variable capacity compressor. This type of swash plate type variable capacity compressor is used in, for example, an automobile air conditioner.

1 is a schematic cross-sectional view of a swash plate type variable capacity compressor 1 according to an embodiment of the present invention. FIG. 3 is a diagram for explaining a rotor 3 and a swash plate 7 of the swash plate type variable capacity compressor 1. FIG. 6 is a diagram for explaining the positional relationship between a load receiving portion triangle 26 and a reaction force locus 27 of the swash plate 7. It is a figure for demonstrating the rotor 72 and the swash plate 73 of the conventional swash plate type variable capacity compressor. It is a figure for demonstrating the positional relationship of the load receiving part triangle 74 and the reaction force locus | trajectory 27 of the conventional swash plate type variable capacity compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Swash plate type variable capacity compressor 2 Drive shaft 3 Rotor 4 Rotor arm 5 Pin 6 Swash plate arm 7 Swash plate 8 Shoe 9 Piston 10 Cylinder 11 Compression reaction force resultant force 12 Top dead center 13 Bottom dead center 14, 15 Straight line 16 Top dead Point side compression area 17 Bottom dead center side compression area 18 Bottom dead center side suction area 19 Top dead center side suction area 20, 21, 24 Load receiving portion 22 Center line 23 Counterweight 24 Swash plate deformation limit portion 26 Load receiving portion Triangle 27 reaction force trajectory

Claims (11)

In a swash plate compressor comprising a swash plate, a rotor that supports the swash plate, and a drive shaft that supports the rotor,
When the surface on the swash plate side of the rotor is divided into a compression region that is a compression process side region and a suction region that is a suction process side region, the rotor receives a load receiver that supports the swash plate on the surface. A swash plate type compressor having a first load receiving portion in the compression region which is located on the rotor side with respect to the intersection of the swash plate and its drive shaft.   2. The swash plate type compressor according to claim 1, wherein the first load receiving portion is provided in a region of the compression region excluding a boundary line between the compression region and the suction region. Machine. In the swash plate compressor according to claim 1,
The compression region is divided into a top dead center side compression region that is a top dead center side region and a bottom dead center side compression region that is a bottom dead center side region, and the suction region is divided into a top dead center side region. When divided into a top dead center side suction region that is a region and a bottom dead center side suction region that is a bottom dead center side region, the first load receiving portion is included in the bottom dead center side compression region. A swash plate compressor.   The swash plate type compressor according to claim 3, wherein the first load receiving portion is in contact with a boundary line between the bottom dead center side compression region and the top dead center side compression region. Machine. In the swash plate compressor according to claim 3,
The rotor has a second load receiving portion for supporting the swash plate on the surface in the top dead center side compression region;
The swash plate compressor, wherein the rotor has a third load receiving portion for supporting the swash plate on the surface in the top dead center side suction region.   2. The swash plate compressor according to claim 1, wherein the swash plate includes a convex portion corresponding to the first load receiving portion.   2. The swash plate compressor according to claim 1, wherein the rotor includes a convex portion corresponding to the first load receiving portion. In the swash plate compressor according to claim 3,
A variable capacity swash plate compressor, wherein the swash plate and the rotor are connected by two sets of link mechanisms,
One of the two sets of link mechanisms is disposed in the top dead center compression region, the other is disposed in the top dead center suction region,
The swash plate type compressor, wherein the first load receiving portion is a swash plate deformation limiting portion that limits a tilt angle of the swash plate. The swash plate compressor according to claim 8,
Each of the two sets of link mechanisms includes a swash plate arm coupled to the swash plate and a rotor arm coupled to the rotor,
The swash plate compressor, wherein the rotor arm is outside the swash plate arm. The swash plate compressor according to claim 8,
Each of the two sets of link mechanisms includes a swash plate arm coupled to the swash plate and a rotor arm coupled to the rotor,
The swash plate type compressor, wherein the rotor arm is inside the swash plate arm.   In a swash plate compressor, comprising: a drive shaft; a rotor supported by the drive shaft; and a swash plate that is variably supported at an eccentric position of the rotor with respect to the drive shaft. A swash plate type compressor, wherein a swash plate deformation limiting portion for limiting a corner is provided at a position corresponding to a region on the compression process side of the rotor.

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