JPH07317655A - Swash plate compressor - Google Patents

Abstract

PURPOSE:To provide a swash plate compressor effectively lubricating the thrust bearings on both sides of a swash plate and excellent in durability at a low cost. CONSTITUTION:This swash plate compressor is provided with a swash plate 3, a drive shaft 2 penetrating the swash plate 3, a pair of thrust bearings 4, 5 provided on the drive shaft 2 and supporting the front and rear of the swash plate 3 in the axial direction of the drive shaft 2, the first fluid guide path 2b communicated with one thrust bearing 4 from the shaft end 3a of the drive shaft 2, and the second fluid guide path 5 guiding the introduced fluid to the other thrust bearing 5 and formed as a passage including a through hole 3a bored on the swash plate 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate compressor used in, for example, a vehicle air conditioner, and more particularly to a swash plate compressor having thrust bearings for supporting the swash plate improved in durability.

[0002]

2. Description of the Related Art Conventionally, a swash plate type compressor having a swash plate and a drive shaft inserted through the swash plate is well known. In this type of compressor, a pair of thrust bearings that support the swash plate from the front and the rear in the axial direction of the drive shaft are provided.

Further, since the life of the thrust bearing has a great influence on the durability of the device itself, the bearing is effectively lubricated to prolong the life of the bearing.

As a method of lubricating the thrust bearing,
For example, the one shown in FIG. 5 is known. In FIG. 5, the swash plate 41 is thrust-supported on the drive shaft 42 from both sides by thrust bearings 43 and 44.
A fluid introduction path 45 is bored in the drive shaft 42 from the shaft end 42a of the drive shaft 42. The fluid introduction path 45 is formed in a hole extending from the shaft end 42a to the thrust bearing 43 on the inner side. Further, the fluid introduction passage 45 has a lateral hole 45.
a and 45 b are provided, and the lateral holes 45 a and 45 b are communicated with the thrust bearings 43 and 44.

In the thrust bearing lubrication system as described above, the fluid containing lubricating oil introduced from the fluid introduction passage 45 bored from the shaft end 42a of the drive shaft 42 (hereinafter simply referred to as fluid) is driven. As the shaft 42 rotates, it advances axially in the fluid introducing passage 45, communicates with the surface of the drive shaft 42, and flows out from the lateral holes 45a, 45b opened in the thrust bearings 43, 44. , 44 are lubricated.

[0006]

However, in the above-described conventional thrust bearing lubrication system, the fluid from the shaft end 42a of the drive shaft 42 to the thrust bearing 43 on the opposite side (back side) from the swash plate 41 is increased. An introduction path 45 is bored. Therefore, the drive shaft 42, which supports the swash plate 41, is formed in a hollow shape at the supporting portion. Considering that the supporting portion of the swash plate 41 of the drive shaft 42 is required to have high strength, it is not preferable to make the portion hollow.

Further, it is extremely difficult to process the fluid introduction passage 45 having a small diameter and a long length on the drive shaft 42, which results in a cost increase.

The present invention focuses on the above problems,
A highly durable swash plate type compressor that efficiently lubricates both thrust bearings without reducing the strength of the swash plate support of the drive shaft, and allows the fluid introduction path for lubrication to be processed at low cost. The purpose is to provide a machine.

[0009]

According to the swash plate type compressor of the present invention which meets the above object, a swash plate, a drive shaft inserted into the swash plate, and a shaft of the drive shaft provided on the drive shaft. In a swash plate compressor having a pair of thrust bearings that support the front and rear of the swash plate in a predetermined direction, a first fluid introduction path communicating with one thrust bearing from the shaft end of the drive shaft is provided, and the introduced fluid is introduced. The second fluid introduction path for guiding the fluid to the other thrust bearing is formed as a flow path including a through hole formed in the swash plate.

The first fluid introduction passage communicates with, for example, a first hole extending axially from the shaft end of the drive shaft and the first hole, and is substantially orthogonal to the axial direction of the drive shaft. A second hole extending in the direction.

Further, the first fluid introduction passage may be formed by a hole extending obliquely with respect to the axial direction from the shaft end of the drive shaft.

The second fluid introducing passage has, for example, the through hole and an escape step formed on both sides of the swash plate so as to communicate with both ends of the through hole and to communicate with the outer periphery of the drive shaft. Is formed into a structure having.

The swash plate side thrust traces of both thrust bearings are normally arranged with a space from the outer peripheral surface of the drive shaft.
A notch may be provided axially through the thrust trace to facilitate passage of the lubricating fluid through this portion.

[0014]

In the swash plate type compressor as described above, the fluid to be lubricated out of the fluid sucked from the outside is first introduced into the first fluid introduction passage, and the fluid is supplied to the first fluid introduction passage. One of the communicating thrust bearings (the bearing closer to the shaft end) is lubricated. Further, the fluid is also sent to the inside of the other thrust bearing via the second fluid introduction passage having the through hole formed in the swash plate, and the other thrust bearing is lubricated.

That is, a part of the fluid sucked from the first fluid introducing passage is supplied for lubrication of one thrust bearing, and the rest is supplied to the other thrust bearing through the second fluid introducing passage. Sent to bearings. The second fluid introducing passage is not formed in the drive shaft but is formed as a passage including the through hole of the swash plate. Therefore, unlike the conventional device, it is not necessary to provide the drive shaft with a long hole penetrating the support portion of the swash plate of the drive shaft, and the strength of the drive shaft in this portion can be ensured while lubricating the thrust bearings. Is done efficiently.

Further, the first fluid introduction passage is connected to the first hole extending in the axial direction from the shaft end of the drive shaft, and communicates with the first hole in a direction substantially orthogonal to the axial direction of the drive shaft. By being formed with the extending second hole, the first fluid introduction path can be formed by a plurality of relatively short holes. Therefore, the processing of the first fluid introduction path is facilitated.

Further, since the first fluid introducing passage can be a hole extending obliquely with respect to the axial direction from the shaft end of the drive shaft, the first fluid introducing passage can be processed in one step. Is also possible. Further, by forming the first fluid introduction path from the oblique hole, the fluid can be supplied to the thrust bearing by utilizing the directivity of the fluid to be introduced, so that the pressure loss of the fluid introduction can be reduced. Becomes

Further, if the second fluid introducing passage is configured to include a through hole and relief steps on both surfaces of the swash plate, which communicate with both ends of the through hole and communicate with the outer circumference of the drive shaft, the fluid penetrates. The escape step facilitates the introduction into the hole and the lead-out from the through hole, and the fluid supply to the other thrust bearing is facilitated. As a result, the fluid is evenly distributed to both thrust bearings, and both thrust bearings are substantially evenly lubricated.

Further, by providing a notch that penetrates the thrust traces in the axial direction on the inner peripheral surfaces of the thrust traces on the swash plate side of both thrust bearings, the fluid can flow into each thrust bearing more easily. Therefore, lubrication is performed more effectively.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the swash plate type compressor of the present invention will be described below with reference to the drawings. 1 and 2 show
1 illustrates a swash plate compressor according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a main body casing, and a drive shaft 2 is extended in the main body casing 1. Drive shaft 2
Are supported by the main body casing 1 via bearings 1a. The drive shaft 2 is inserted through the swash plate 3.
The swash plate 3 is mounted on the drive shaft 2 and has a pair of thrust bearings 4,
It is supported from the front and back by 5.

The drive shaft 2 is provided with a first fluid introduction passage 2b. The fluid introduction path 2b is connected to the first hole 2c and the second hole 2c.
2d of the hole. The first hole 2c extends in the axial direction from the shaft end 2a of the drive shaft 2. In addition, the second hole 2d is opened in a direction orthogonal to the first hole 2c, that is, a direction substantially orthogonal to the axial direction of the drive shaft 2. The second hole 2d communicates with one thrust bearing 4.

As shown in FIG. 3, a plurality of notches 4b are formed on the inner peripheral surface 4a of the thrust trace 4 on the side of the swash plate 3 of the thrust bearing 4 so as to penetrate the thrust trace in the axial direction. Further, the thrust bearing 5 on the opposite side of the swash plate 3 is also provided with a notch 5b axially penetrating the thrust race 5 inner peripheral surface 5a on the swash plate 3 side. The notches 4b and 5b communicate with relief steps 6a and 6b, which will be described later.

The swash plate 3 is provided with a through hole 3a extending in the axial direction of the drive shaft 2 (that is, in the direction parallel to the axis of the drive shaft 2). Escape steps 6a and 6b are formed on both surfaces of the swash plate 3 and at both ends of the through hole 3a so as to communicate with the through hole 3a and to communicate with the outer periphery of the drive shaft 2.
A second fluid introduction path 3b is formed by the through hole 3a and the escape steps 6a and 6b. These escape steps 6a and 6b
Extends all around in the circumferential direction.

A piston 8 is connected to the swash plate 3 through sliding contact with a shoe 7 having an outer peripheral surface having a spherical shape. The piston 8 extends to the left and right cylinder bores 9a and 9b.

A suction chamber 10a is connected to the cylinder bore 9a through a suction hole 17a having an opening / closing valve 16a. Further, the discharge chamber 11a and the cylinder bore 9a are communicated with each other through a discharge hole 13a having an opening / closing valve 12a. On the other hand, a suction chamber 10b is connected to the cylinder bore 9b through a suction hole 17b having an opening / closing valve 16b. Further, the discharge chamber 11b and the cylinder bore 9b are communicated with each other through a discharge hole 13b having an opening / closing valve 12b.

The suction chambers 10a and 10b are provided with a passage 14
It is connected to the swash plate chamber 1b via a and 14b. The suction chamber 10b is connected to a suction port 15 that sucks fluid from the outside.

The fluid sucked from the suction port 15 into the suction chamber 10b is sent into the cylinder bore 9b. The fluid sent into the suction chamber 10b is sent from the passage 14b to the suction chamber 10a through the swash plate chamber 1b and the passage 14a, and then flows into the cylinder bore 9a. Then, when power from a drive source (not shown) such as an automobile engine is transmitted to the drive shaft 2, the swash plate 3 rotatably supported by the thrust bearings 4 and 5 on the housing side is rotated. It With the rotation of the swash plate 3, the shoe 7
The piston 8 connected through the cylinder bores 9a, 9
The fluid is compressed by reciprocating in b. The compressed fluid is
It is discharged into the discharge chambers 11a and 11b through the discharge holes 13a and 13b.

Further, the fluid sucked from the suction port 15 is introduced into the first hole 2c of the first fluid introducing passage 2b formed from the shaft end 2a of the drive shaft 2. The introduced fluid is introduced into the notch 4b portion in the present embodiment through the second hole 2d, and part of the fluid is sent into the thrust bearing 4. As a result, the thrust bearing 4 is lubricated by the introduced fluid. The remaining fluid that has been distributed is sent from the notch 4b into the escape step 6a.

The fluid sent into the escape step 6a is swash plate 3
It is sent to the escape step 6b through the through hole 3a. Since the escape step 6b and the inside of the thrust bearing 5 are communicated with each other through the notch 5b, the fluid is sent into the thrust bearing 5 through the notch 5b. As a result, the thrust bearing 5 is lubricated by the introduced fluid.

As described above, in the apparatus of this embodiment, the fluid introduced from the shaft end 2a of the drive shaft 2 into the first fluid introduction passage 2b passes through the first fluid introduction passage 2b, The part is supplied to the thrust bearing 4, and the rest is supplied to the other thrust bearing 5 through the second fluid introduction path 3b. Therefore, both thrust bearings 4, 5 are effectively lubricated by the supply fluid. Although it is desirable that the amount of fluid distributed to both thrust bearings 4 and 5 be equal, this is achieved by appropriately determining the drilling position of the second hole 2d and the second fluid introducing passage 3b. This is achieved by designing by considering the pressure loss at.

Further, in the apparatus of this embodiment, the first fluid introducing passage 2b is not constructed so as to penetrate the supporting portion of the swash plate 3 of the drive shaft 2, but is formed so as to bypass before it. (Fig. 2). Therefore, since the supporting portion of the swash plate 3 of the drive shaft 2 is not made hollow as in the conventional example (FIG. 5), there is no possibility of lowering the strength of this portion of the drive shaft 2.

Further, since the first fluid introducing passage 2b is formed by the first hole 2c and the second hole 2d which are relatively short holes, the processing of the first fluid introducing passage 2b is extremely easy. To be done.

The second fluid introducing passage 3c has a through hole 3
a and the relief steps 6a and 6b at both ends of the through hole 3a, the fluid that has flowed into the relief steps 6a and 6b follows the shape of the relief steps 6a and 6b. Is smoothly sent from the outer peripheral portion or in the outer peripheral direction with a small resistance. Further, since the relief steps 6a and 6b extend annularly over the entire circumference in the circumferential direction, the fluid also spreads over the entire circumference in the circumferential direction, and the entire thrust bearings 4, 5 are uniformly lubricated.

FIG. 4 shows a partial cross section of a swash plate type compressor according to another embodiment of the present invention. In this embodiment,
The first fluid introduction passage 20 is formed as a single passage extending obliquely with respect to the axial direction from the shaft end 2a of the drive shaft 2. Even in such a configuration, the same operation and effect as those shown in the above-described embodiment can be obtained.

Further, in this embodiment, since the first fluid introduction passage 20 is formed by one hole, the first fluid introduction passage 20 can be drilled by one processing. Is.

Further, by forming the first fluid introducing passage 20 from the oblique hole, the fluid can be sent by utilizing the directivity of the introduced fluid, the pressure loss of the fluid is reduced, and the fluid is sufficiently reduced. It is possible to supply a large amount of fluid for lubrication.

[0037]

As described above, according to the swash plate type compressor of the present invention, the flow path of the lubricating fluid is formed without lowering the strength of the drive shaft, and both thrust bearings are effectively Since it is reliably lubricated, the life of the thrust bearing can be extended and the durability of the device can be improved.

Further, since the working of the fluid introducing passage is facilitated, the working cost of the fluid introducing passage can be reduced, and consequently the manufacturing cost of the apparatus can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a swash plate compressor according to an embodiment of the present invention.

2 is a partially enlarged cross-sectional view of the device of FIG.

3 is a plan view of a thrust bearing of the device of FIG.

FIG. 4 is a partially enlarged vertical view of a swash plate compressor according to another embodiment of the present invention.

FIG. 5 is a partially enlarged vertical sectional view of a conventional swash plate compressor.

[Explanation of symbols]

 1 main body casing 1a bearing 1b swash plate chamber 2 drive shaft 2a shaft end 2b, 20 first fluid introduction passage 2c first hole 2d second hole 3 swash plate 3a through hole 3b second fluid introduction passage 4, 5 thrust Bearing 4a, 5a Thrust trace inner peripheral surface 4b, 5b Notch 6a, 6b Escape step 7 Shoe 8 Piston 9a, 9b Cylinder bore 10a, 10b Suction chamber 11a, 11b Discharge chamber 14a, 14b Passage 15 Suction port

Claims (5)

[Claims] 1. A swash plate, and a drive shaft inserted through the swash plate,
In a swash plate compressor having a pair of thrust bearings provided on the drive shaft and supporting the front and rear of the swash plate in the axial direction of the drive shaft, a first swash plate compressor communicating from a shaft end of the drive shaft to one thrust bearing. A slanting plate is provided, and a second fluid introducing passage for guiding the introduced fluid to the other thrust bearing is formed as a passage including a through hole formed in the swash plate. Plate compressor. 2. The first fluid introducing passage communicates with the first hole extending in the axial direction from the shaft end of the drive shaft and is substantially perpendicular to the axial direction of the drive shaft. Second extending in the direction
The swash plate compressor according to claim 1, wherein the swash plate compressor has a hole. 3. The swash plate compressor according to claim 1, wherein the first fluid introduction passage is a hole extending obliquely from the axial end of the drive shaft with respect to the axial direction. 4. A relief step in which the second fluid introduction passage is formed on both surfaces of the through hole and on both sides of the swash plate so as to communicate with both ends of the through hole and to the outer periphery of the drive shaft. The swash plate compressor according to any one of claims 1 to 3, further comprising: 5. The slant according to claim 1, wherein a notch that axially penetrates the thrust traces is provided on inner peripheral surfaces of the thrust traces on the swash plate side of both thrust bearings. Plate compressor.