JP2000038984A - Swash plate type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of seizure even when a driving shaft is rotated at the high speed, and concurrently, reduce the occurrence of noise and vibration caused by abrasion between each shoe and a swash plate. SOLUTION: This swash plate type compressor is equipped with an axial directional passage 61 provided for a driving shaft to lead lubricant to the axial direction, and with a radial directional passages 61b, 61c, 61d and 61e, which are provided for the driving shaft 7 to feed lubricant in the inside of the axial directional passage 61 to sliding parts. In this case, cut-outs 62b, 62c, 62d and 62e for reducing the outflow resistance of lubricant flowing out of the radial directional passages 61b, 61c, 61d and 61e, are formed up in the radial directional passages 61b, 61c, 61d and 61e located behind the rotational direction of the driving shaft 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a swash plate type compressor.

[0002]

2. Description of the Related Art A conventional swash plate compressor includes a drive shaft and an oil pump that rotates in synchronization with the drive shaft. The lubricating oil sucked from the oil reservoir below the cylinder block by the oil pump is supplied to the oil passage of the drive shaft,
It is spread on sliding parts such as bearings by the centrifugal force of the drive shaft.

FIG. 4A is a side view of a conventional drive shaft.
4B is a sectional view taken along the line AA in FIG. 4A, and FIG. 4C is an enlarged view taken in the direction of the arrow B in FIG. 4B.

The conventional drive shaft 107 has an axial passage 161.
And the radial passages 161b, 161c, 161d, 16
1e.

The axial passage 161 is provided on the center axis of the drive shaft 107, and guides the lubricating oil in the axial direction (from right to left in FIG. 4).

The radial passages 161b, 161c, 161
d and 161e are formed radially outward from the axial passage 161 to supply lubricating oil to a sliding portion such as a bearing. These radial passages 161b, 161c, 161d, 161e
Are provided in the axial direction (four in FIG. 4A).

[0007]

FIG. 4 shows the flow of the lubricating oil.
Description will be made based on (b).

When the drive shaft 107 rotates in the direction indicated by arrow a (clockwise), the lubricating oil flows out of the opening of the radial passage 161d in the direction indicated by arrow b (counterclockwise).

However, when the drive shaft 107 rotates at a high speed, the lubricating oil collides with the rear side of the opening of the radial passage 161d in the direction of rotation of the drive shaft, so that the lubricating oil outflow resistance at the opening increases. (See FIG. 4B).

[0010] As a result, the amount of the lubricating oil supplied to the sliding portion is insufficient, and the sliding portion may be burned, or noise or vibration may occur due to wear between the shoe and the swash plate. There is a problem.

The present invention has been made in view of such circumstances, and its object is to prevent burning even when the drive shaft rotates at a high speed, and to reduce noise and vibration generated due to wear. An object of the present invention is to provide a plate compressor.

[0012]

According to a first aspect of the present invention, there is provided a drive shaft, wherein an axial passage for introducing lubricating oil in an axial direction is provided on the drive shaft, and A swash plate type compressor having a radial passage for supplying lubricating oil in an axial passage to a sliding portion, wherein a notch for reducing the outflow resistance of the lubricating oil flowing from the radial passage to the drive shaft is provided. It is characterized by being formed.

Even when the drive shaft rotates at a high speed, the lubricating oil guided to the radial passage flows out smoothly, and a large amount of lubricating oil can be supplied to the sliding portion.

According to a second aspect of the present invention, in the swash plate type compressor according to the first aspect, the notch is located behind the opening of the radial passage in the drive shaft rotation direction. I do.

[0015] Even when the drive shaft rotates at a high speed, the lubricating oil flows along the notch located on the rear side in the drive shaft rotation direction of the radial passage.

[0016]

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

FIG. 2 is a longitudinal sectional view of a swash plate type compressor according to one embodiment of the present invention.

The cylinder block 1 on the front side and the cylinder block 2 on the rear side are axially opposed to each other via an O-ring 32.

A front head 4 is fixed to one end of the joined cylinder blocks 1 and 2 via a valve plate 3, and a rear head 6 is connected to the other end via a valve plate 5.
Has been fixed.

Gaskets 80 and 81 are arranged between the valve plate 3 and the front head 4 and between the valve plate 5 and the rear head 6, respectively.

A drive shaft 7 is provided at the center of the cylinder blocks 1 and 2, and a swash plate 8 is fixed to the drive shaft 7. The drive shaft 7 and the swash plate 8 are rotatably supported on the cylinder blocks 1 and 2 by a radial bearing 9 and a thrust bearing 10.

The swash plate 8 includes the joined cylinder blocks 1 and 2.
2 is housed in a swash plate chamber 31 formed inside.

The cylinder blocks 1 and 2 are provided with a plurality of cylinder bores 11. The axis of each cylinder bore 11 is parallel to the drive shaft 7, and each cylinder bore 11 is arranged at predetermined intervals in the circumferential direction around the drive shaft 7.

A piston 12 is slidably accommodated in each cylinder bore 11. In addition, each cylinder bore 11
Inside, compression chambers 21 and 22 are formed on both sides of the piston 12.

The piston 12 is connected to the swash plate 8 via shoes 19 and 20. The piston 12 linearly reciprocates in the cylinder bore 11 as the swash plate 8 rotates.

The valve plates 3 and 5 are provided with a suction port (not shown) and a discharge port (not shown),
The compression chambers 21 and 22 communicate with the suction chamber 23 via the suction port, and the compression chambers 21 and 22 communicate with the discharge chamber 24 via the discharge port.

On one surface of the valve plates 3, 5, suction valves 25, 26 for opening and closing suction ports are provided.

A discharge valve (not shown) for opening and closing a discharge port is provided on the other surface of the valve plates 3 and 5.

Below the cylinder blocks 1 and 2, there is provided an oil sump chamber 70 for accumulating lubricating oil O.

The rear head 6 is provided with an oil suction chamber 51 which communicates with the oil sump chamber 70 of the cylinder blocks 1 and 2 through the oil passage 60.

An oil pump 40 composed of an inner gear and an outer gear is provided at the rear end of the drive shaft 7 projecting into the oil suction chamber 51.

The arrows in FIG. 2 indicate the flow of the lubricating oil O.

FIG. 1A is a side view of the drive shaft, and FIG.
1A is a cross-sectional view taken along the line CC of FIG. 1A, and FIG.
It is the D arrow enlarged view of (b).

The drive shaft 7 has an axial passage 6 for supplying lubricating oil O from the oil suction chamber 51 to sliding parts such as the bearings 9 and 10.
1 is provided.

The axial passage 61 is located on the center axis of the drive shaft 7. The drive shaft 7 has radial passages 61b, 61c, 61d, and 61e formed radially outward from the axial passage 61.

Notches 62b, 62c, 62d and 62e are formed in the openings of the radial passages 61b to 61e. The notches 62b to 62e are located on the rear side in the rotation direction of the drive shaft 7.

The notches 62b to 62e form flat portions 63b, 63c, 63d and 63e having a predetermined width substantially orthogonal to the radial passages 61b to 61e.

Next, the operation of the swash plate type compressor will be described.

When the drive shaft 7 rotates, the swash plate 8 also rotates integrally. Since the sliding surface of the swash plate 8 is inclined with respect to a virtual plane orthogonal to the rotation center of the drive shaft 7, the piston 12 reciprocates in the cylinder bore 11 by the rotation of the drive shaft 7.

Since the piston 12 is at the position closest to the valve plate 5 (right side in FIG. 2), the swash plate 8
/ 2 revolutions, the piston 12 moves to the position shown in FIG.
To the left), and the suction stroke is completed on the compression chamber 21 side. At this time, the compression stroke is completed on the compression chamber 22 side.

When the swash plate 8 further rotates by か ら from this state, the suction stroke is completed on the compression chamber 22 side, and
The compression stroke is completed on the side.

When the drive shaft 7 rotates, the inner gear attached to the rear end of the drive shaft 7 rotates integrally, and the outer gear rotates with the rotation. The lubricating oil O in the oil sump chamber 70 is sucked into the oil suction chamber 51 through the oil passage 60 due to the difference in the number of revolutions between the inner gear and the outer gear.

The lubricating oil O in the oil suction chamber 51 flows in from the inlet 61a of the axial passage 61, and flows in the radial passages 61b, 61b.
It flows out from 61c, 61d, 61e.

The flow of the lubricating oil O will be described with reference to FIGS.

When the drive shaft 7 rotates in the direction of arrow c, the lubricating oil O flows out as shown by arrow d, and the thrust bearing 1
0 is supplied.

The other radial passages 61b, 61c,
The lubricating oil O also has notches 62b, 62c,
It flows out along 62 e and is supplied to sliding parts such as the thrust bearing 10, the oil seal 71, and the contact parts between the shoes 19 and 20 and the swash plate 8.

Thereafter, the lubricating oil O is returned to the oil reservoir 70 through the oil passage 72.

According to the swash plate compressor according to this embodiment, the outflow resistance of the lubricating oil O at the openings of the radial passages 61b, 61c, 61d, 61e is reduced, so that the drive shaft 7 rotates at a high speed. However, the lubricating oil O guided from the oil reservoir chamber 70 to the axial passage 61 through the oil passage 60 and the oil suction chamber 51 is supplied to the radial passages 61b and 61.
c, 61d, and 61e, can be sufficiently sprayed to the sliding portions such as the bearings 9 and 10, so that seizure due to lack of lubricating oil O can be prevented, and between the shoes 19 and 20 and the swash plate 8 can be prevented. Noise and vibration generated due to the wear of the tire can be reduced.

FIG. 3A is a side view of a drive shaft according to a modification, FIG. 3B is a sectional view taken along line EE of FIG.
FIG. 3C is an enlarged view as viewed from an arrow F in FIG.

In the above embodiment, the notches 62b to 62e
Are formed by flat portions 63b to 63e having a predetermined width substantially orthogonal to the radial passages 61b to 61e, and the portions where the radial passages 61b to 61e intersect with the flat portions 63b to 63e are substantially perpendicular to each other. Radial passage 61b
The present embodiment differs from the above-described embodiment in that a portion where the flat portions 63b to 63e intersect with the flat portions 63b to 63e is cut and rounded.

According to this modification, the radial passage 61b
The lubricating oil outflow resistance at the opening of ~ 61e becomes smaller,
It is possible to obtain the effect more than the above-described embodiment.

In the above modification, the radial passage 61
b, 61c, 61d, 61e and flat portions 63b, 63c,
A portion where 63d and 63e intersect may be cut without rounding.

[0053]

As described above, according to the swash plate type compressor according to the first or second aspect of the present invention, even when the drive shaft rotates at a high speed, the outflow of the lubricating oil from the opening of the radial passage. Since the resistance is reduced, a large amount of lubricating oil can be supplied to the sliding portion, and seizure of the sliding portion can be prevented, and noise and vibration caused by wear can be reduced.

[Brief description of the drawings]

1 (a) is a side view of a drive shaft, FIG. 1 (b) is a cross-sectional view taken along line CC of FIG. 1 (a), and FIG. 1 (c) is FIG. 1 (b)
FIG.

FIG. 2 is a longitudinal sectional view of a swash plate type compressor according to one embodiment of the present invention.

3A is a side view of a drive shaft according to a modification, FIG. 3B is a cross-sectional view taken along the line EE of FIG. 3A, and FIG.
FIG. 4 is an enlarged view as viewed from the direction of arrow F in FIG.

FIG. 4 (a) is a side view of a conventional drive shaft, and FIG.
4B is a sectional view taken along the line AA in FIG. 4A, and FIG. 4C is an enlarged view taken in the direction of the arrow B in FIG. 4B.

[Explanation of symbols]

 7 Drive shaft 61 Axial passage 61b, 61c, 61d, 61e Radial passage 62b, 62c, 62d, 62e Notch O Lubricating oil

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuo Nagata 39, Higashihara, Chiyo-ji, Odai-gun, Osato-gun, Saitama Prefecture Inside of Zexel Gangnam Plant (72) Inventor Koji Honma Higashihara, Chiyo-ji, Osan-gun, Osato-gun, Saitama No. 39 Inside Zexel Gangnam Plant (72) Shinichi Hara Inventor Shinichi Hara No. 39 Higashihara, Chiyo-ji, Konan-cho, Osato-gun, Saitama F-term (reference) 3H003 AA03 BA00 BD07 BD09 CA01 3H076 AA07 BB01 BB17 BB26 CC63 CC72

Claims (2)

[Claims] 1. An axial passage provided in a drive shaft and guiding lubricating oil in an axial direction, and a radial passage provided in the drive shaft and supplying lubricating oil in the axial passage to a sliding portion. The swash plate compressor according to claim 1, wherein a notch is formed in said drive shaft to reduce an outflow resistance of said lubricating oil flowing out of said radial passage. 2. The swash plate compressor according to claim 1, wherein the notch is located on a rear side of the opening of the radial passage in the drive shaft rotation direction.