JPH11294326A - Swash plate type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily control a pressure in a crank chamber so as to improve responsiveness by providing a communication groove communicating with an intake side from the crank chamber, at a receiving surface where a cylinder block and a thrust bearing are in contact with each other. SOLUTION: A thrust race 140 of a thrust bearing 14 provided in a crank chamber is provided with a communication groove 802 as a communication passage to communicate the crank chamber with an intake chamber, which groove 802 is formed at a receiving surface 80 in a center bore 8. A plurality of the grooves 802 are provided in the radial direction and the groove 802 communicates with a passage 801 of the center bore 8 being a gap formed with respect to thrust bearings 14. Accordingly, an inner pressure of the crank chamber 2 is controlled speedily for improving responsiveness, capacity controllability, and cooling performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate type compressor used for air conditioners for vehicles, automobiles, general use and the like.

[0002]

2. Description of the Related Art FIG. 1 is a sectional view of a variable displacement swash plate type compressor. The structure and function of the swash plate type variable displacement compressor will be described with reference to this sectional view. The crankcase 2 and a plurality of pistons 100 and the like are housed inside the compressor casing 1. Further, a suction chamber 11 and a discharge chamber 13 are formed by the cylinder head 12.

When the main shaft 3 rotates, the rotor 5 rotates,
The rotational motion is transmitted to the swash plate boss 7 via the hinge mechanism 6, and the swash plate boss 7 rotates integrally with the main shaft 3. On the other hand, the swash plate 9 connected to the swash plate boss 7 has a piston 100 attached by a shoe of the ball connecting portion 101. When the swash plate 9 rotates at an inclination angle, the swash plate 9 swings, and its movement is
The piston 100 reciprocates along the cylinder block 20 via the shoe of the ball connecting portion 101. Reference numeral 4 denotes a rotor rotation stopping pin. Other structures are as already known.

In the conventional variable displacement swash plate type compressor, a communication passage for communicating the crank chamber and the suction chamber for controlling the inclination angle of the swash plate is provided with a gap between the thrust bearing and the main shaft. Used for that purpose.

In a fixed capacity swash plate type compressor, the crank chamber and the suction chamber are provided with holes between adjacent cylinders and used as pressure balance passages.

[0006]

In the conventional variable displacement type swash plate type compressor, the thrust bearing and the main shaft are connected to each other in order to control the inclination angle of the swash plate so that the crank chamber communicates with the suction chamber. Since the gap was used as a communication passage, the flow path was insufficient and the control valve was fully opened, and even if an attempt was made to lower the pressure in the crank chamber, there was a time difference when the pressure in the crank chamber became equal to the suction pressure. It took time for the suction capacity of the machine to reach its maximum capacity.

Similarly, also in a fixed capacity swash plate type compressor, it is necessary to escape to the suction chamber in order to prevent the pressure in the crank chamber from rising. Needed.

[0008] Further, in the conventional lubrication method for lubricating the bearing, there is a problem in that the fluid resistance is large and there is a difficult surface, and there is a problem particularly at high speed rotation. In addition, in the fixing method, lubrication of the bearing portion is difficult, and the bearing is liable to be damaged.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a variable displacement swash plate type compressor in which a crank chamber pressure is quickly adjusted to improve responsiveness. The purpose is to improve the life of the device.

[0010]

According to the present invention, there is provided a swash plate type compression apparatus in which pistons in a plurality of cylinders are reciprocated by the rotational motion of a swash plate in a crank chamber. In the machine, one or one or more communication grooves communicating with the suction side from the crank chamber are provided on a receiving surface where the cylinder block contacts the thrust bearing.

Further, in a variable displacement swash plate type compressor in which the displacement is controlled by changing the swash plate angle by the crank chamber pressure,
A communication groove is provided in a receiving surface where the cylinder block and the thrust bearing come into contact with each other to communicate from the crank chamber to the suction side via a flow control valve.

[0012]

Embodiments of the present invention will be described below based on embodiments with reference to the drawings. FIG. 1 shows a mechanism for adjusting the pressure in the crank chamber 2 of the swash plate type compressor 1 having a variable capacity.

In the variable capacity swash plate type compressor 1, a gap extending from the crank chamber 2 to the suction chamber 11 has been conventionally used as a communication path. By releasing the pressure in the crank chamber 2 to the suction chamber 11, the internal pressure is adjusted, and as a result, the variation changes the inclination angle of the swash plate 9 in contact with the swash plate boss 7.
The swash plate 9 has a plurality of pistons 100
Is mounted, the swash plate 9 rotates at an inclination angle, the swash plate 9 swings, and the movement of the swash plate 9 is reciprocated in the cylinder 20 (cylinder block) via the ball connecting portion 101. Move.

Therefore, a groove provided in the cylinder 20 (block) passes through a communication path including a gap from the thrust bearing 14 and the rear bearing (radial bearing) 143 provided in the crank chamber 2 to the flow control valve 15. From 15
In the present invention, as shown in FIG. 4, the thrust trace 140 of the thrust bearing 14 is
A communication groove 802 for communicating the inside of the crank chamber 2 and the suction chamber 11 is provided on the receiving surface 80 that comes into contact with the inside, thereby forming a communication passage.

FIG. 3 shows that a plurality of communication grooves 802 are provided in the radial direction, but they can be installed if necessary. The communication groove 802 is provided with the communication groove 802 in the receiving surface 80 where the thrust trace 140 of the thrust bearing 14 comes into contact with the center bore 8. However, the communication groove 802 is provided in the thrust trace 140 side or in both the thrust trace 140 and the receiving surface 80. It can also be provided. FIG. 4 shows an example in which the slit 141 is also provided on the thrust trace 140 side. In this case, the flow can be made even less lossy.

In FIG. 2 and FIG. 3, the center bore 8 has a passage 801 serving as a gap between the center bore 8 and the thrust bearing 14, and communicates with a communication groove 802 provided in the receiving surface 80 in contact with the center bore 8.

Therefore, the pressure medium from the crank chamber 2 is:
A receiving surface 8 through which a thrust trace 140 comes into contact with a passage which is a gap between the center bore 8 and the thrust bearing 14.
0 through the communication groove 802 provided in the upper part of the fluid control valve 15.
The pressure in the crank chamber 2 is reduced.

Even with a fixed swash plate compressor, the crank chamber 2
The internal pressure reduction configuration is the same. In this case, the conventional method communicates with the suction chamber through a hole provided between adjacent cylinders. However, in the method of the present invention, since the gas flows through the rear bearing (radial bearing) 143, the lubricating action is improved, and the rear bearing is improved. 143 will have increased durability. FIG.
As shown in FIG. 7, a communication groove 802 is provided in the wall surface of the cylinder block, and a spring 142 such as a disc spring is provided at one end of the thrust trace 140 of the thrust bearing 14.

In FIG. 3 or 4, a communication groove 802 is provided in the receiving surface 80 where the thrust trace 140 of the thrust bearing 14 comes into contact with the center bore 8 to communicate the inside of the crank chamber 2 with the suction chamber 11. Although it was a passage,
FIG. 5 shows an embodiment in which a notch is provided on the receiving surface 80 of the thrust trace 14 of the center bore 81 of the cylinder block, and the thrust trace 14 is mounted thereon to form a communication groove 802.

The flow flows from the crank chamber 2 to the communication groove 802, and then passes through the center bore 8 while lubricating the rear bearing (radial bearing) 143, and from the gap 803 to the suction chamber 11.

The present invention is of course applicable to those skilled in the art for other compressors having a crankcase.

[0022]

The present invention has solved the conventional problems described above, and the following effects can be obtained by using the present invention.

When the present invention is applied to a swash plate type compressor of variable capacity, the response becomes good, so that the response of the inclination angle of the swash plate becomes quick, the capacity controllability is improved, and the cooling performance is improved.

Even in a fixed capacity swash plate type compressor, the lubrication of the radial bearing 142 is improved, so that the durability is increased.

Further, in the swash plate type compressor having a fixed capacity, it is not necessary to form a balance hole for connecting the crank chamber and the suction chamber, which is conventionally provided, and the cost can be reduced.

Further, the communication passage of the present invention is also preferable as a passage for lubricating oil, and a synergistic effect of improving responsiveness and improving lubrication can be expected. Durability also increases due to its lubricating effect.

[Brief description of the drawings]

FIG. 1 is a view for explaining a structure of a variable capacity swash plate type compressor according to the related art.

FIG. 2 shows an embodiment of a variable displacement swash plate type compressor according to the present invention.

FIG. 3 is a partially enlarged view of an arrow AA in the embodiment of the present invention shown in FIG. 2;

FIG. 4 is a partially enlarged view of arrow peep BB in FIG. 3;

FIG. 5 is a view showing one embodiment of a fixed capacity swash plate type compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Swash plate compressor casing 2 Crank chamber 3 Main shaft 4 Rotor rotation stop pin 5 Rotor 6 Hinge mechanism 7 Swash plate boss 8 Center bore 80 Receiving surface 801 Passage 802 Communication groove 803 Gap 81 Center bore 9 Swash plate 100 Piston 101 Ball connection Part 11 suction chamber 12 cylinder head 13 discharge chamber 14 thrust bearing 140 thrust trace 141 slit 142 spring 143 rear bearing 15 flow control valve 20 cylinder (cylinder block)

Claims (2)

[Claims] In a swash plate type compressor in which pistons in a plurality of cylinders are reciprocated by a rotational movement of a swash plate in a crank chamber, a receiving surface in contact between a cylinder block and a thrust bearing is communicated from the crank chamber to a suction side. A swash plate type compressor provided with one or more communication grooves. 2. A variable displacement swash plate type compressor in which displacement is controlled by changing a swash plate angle by a crank chamber pressure, wherein a suction surface is sucked from a crank chamber through a flow control valve into a receiving surface where a cylinder block and a thrust bearing contact. A variable capacity swash plate type compressor having a communication groove communicating with the side.