JPS63253183A - Swash plate type compressor - Google Patents

Abstract

PURPOSE:To enhance a lubrication quality, by forming a suction passage, through which a swash plate chamber communicates with a cylinder bore, in a piston and setting a suction port of that passage in the vicinity of a recessed part of containing a shoe. CONSTITUTION:A piston 6, which forms housing recessed parts 7a to be opposed in both end surfaces of a swash plate passing groove part and a surface of a swash plate 3. The piston 6 forms a pair of suction passages 10, through which a cylinder bore communicates with a swash plate chamber 9, setting a suction port 10a of the passage 10 in the vicinity of the housing recessed part 7a. A compressor, when it is in a suction stroke, generates a flow of refrigerant gas toward the suction port 10a in the vicinity of the housing recessed part 7a, and mist-state lubricating oil in the gas is directly supplied to a sliding location of clearance or the like between the shoe 8 and the housing recessed part 7a.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention is directed to a combination of a swash plate on a rotating shaft supported by a cylinder block and a piston accommodated in the cylinder block so as to be able to reciprocate and slide. The present invention relates to a swash plate compressor having a shoe interposed therebetween, and particularly to a lubricating oil supply structure that improves the lubricity of the sliding portion with the shoe.

(Prior Art) Shoes interposed between both end faces of a swash plate passage groove formed in the axial center of a piston that reciprocates due to rotation of the swash plate and both front and rear surfaces of the swash plate are disposed on the end faces. It is adapted to be fitted and held within the formed spherical receiving recess. Since the hemispherical shoe that is fitted and held in the accommodation recess is pressed against the swash plate and the accommodation recess due to the high speed rotation of the swash plate, sufficient lubricity is required between the swash plate and the accommodation recess and the hemispherical shoe.
For this lubrication, there was a mistake in the refrigerant supply to the cylinder bore via the swash plate chamber and suction chamber!・Type lubricating oil is used.

(Problem to be Solved by the Invention) However, the refrigerant gas supplied from the peripheral surface of the cylinder block to the swash plate chamber tends to flow toward the outer periphery of the swash plate chamber due to the rotational force of the swash plate. Since the suction passage connecting the plate chamber and the suction chamber is set at a position relatively far from the housing recess, it is possible to sufficiently supply the mist of lubricating oil in the refrigerant gas to the vicinity of the hemispherical shoe within the rotation radius of the swash plate. is difficult. For this reason, it is not possible to provide sufficient lubricity to avoid IT wear of the housing recess and swash plate that are in sliding relationship with the hemispherical shoe, or seizure between the two, and the conventional refrigerant gas supply route setting cannot It is not possible to improve lubricity.

Structure of the Invention (Means for Solving the Problems) Therefore, in the present invention, an accommodation recess for fitting and accommodating the spherical part of the shoe is formed on the end face of the swash plate passage groove of the piston, and the swash plate chamber and the cylinder bore are communicated with each other. A suction passage was formed in the piston, and its suction port was set near the four housing parts.

(effect) 1! In the refrigerant gas suction step, the refrigerant gas in the swash plate chamber is sucked and guided toward the suction port near the housing recess, and a refrigerant gas flow is generated near the shoes. As a result, the mist-like lubricating oil in the refrigerant gas is directly supplied to the sliding area between the spherical shoe and the housing recess, and the refrigerant gas is released in the outer circumferential direction due to the rotational force of the swash plate. Compensated by supply route setting. Therefore, the lubricity of the sliding portions between the shoe, the accommodation recess, and the swash plate is improved, and wear damage and eventually seizure are suppressed.

(Example) Hereinafter, an example embodying the present invention will be described based on FIGS. 1 and 2.

As shown in FIG. 1, a pair of cylinder blocks 1.2 that are tightened together support a rotating shaft 4 for supporting a swash plate 3, and a plurality of rotating shafts 4 are arranged at equal angular positions around the rotating shaft 4. cylinder bores 5 are formed, and each cylinder bore 5
A piston 6 is fitted inside so as to be able to slide back and forth. A groove 7 for passing the swash plate 3 is formed in the center of the piston 6 in the central axis direction, and spherical accommodation recesses 7a are formed on both end surfaces of the swash plate passage groove 7 to face each other. Each accommodation recess 7a
A hemispherical shoe 8 is interposed between the front and rear (left and right in FIG. 1) surfaces of the swash plate 3.
A spherical portion is fitted into each accommodation recess 7a.

A pair of suction passages 10 are formed in the piston 6 to communicate the cylinder bore 5 and the swash plate chamber 9.
a is set near the accommodation recess 7a, and the outlet 1
0b is set on both end faces of the piston 6. A valve 11 made of an elastic plate is tightly fixed to both end faces of the piston 6 by a pole 12, and an outlet 10b is releasably closed by the pulp 11.

A valve plate 15 is interposed between the front housing 13 and the cylinder block 1 which are fixedly connected to the cylinder block 1 end, and a valve plate 15 is interposed between the cylinder block 2 and the rear housing 14 which is connected and fixed to the cylinder block 2 end. A pulp plate 16 is interposed between them,
The discharge chambers 13a, 14a in both housings 13, 14 communicate with the cylinder bore 5 through discharge ports 15a, 16a. The discharge ports 15a, 16a are releasably closed by discharge valves 17.18, and the movable range of the discharge valves 17.18 is restricted by presser plates 19.20. The discharge ports 15a and 16a are provided at positions corresponding to the bolts 12 when viewed in the direction of the central axis of the piston 6, and are located at positions corresponding to the bolts 12.
The head can be accommodated within the discharge ports 15a, 16a.

Now, due to the suction action accompanying the reciprocating movement of the piston 6, refrigerant gas enters the swash plate chamber 9 from the supply passage 21 on the circumferential surface of the cylinder blocks 1 and 2, passes through the suction passage 10, and enters the cylinder bore 5.
introduced into the world. The refrigerant gas introduced into the cylinder bore 5 is compressed by the piston 6 while being compressed by the discharge ports 15a and 1.
6a, the discharge chambers 13a and 14a, and the discharge passage 22, and is discharged from the discharge passage 23 on the circumferential surface of the cylinder blocks 1 and 2. Suction port 10a that becomes part of the refrigerant gas supply path
is set near the accommodation recess 7a, so during the suction process, a refrigerant gas flow toward the suction port 10a is generated near the accommodation recess 7a. As a result, the mist of lubricating oil in the refrigerant gas is directly supplied to the clearance between the hemispherical shoe 8 and the four housing parts 7a, and to the sliding area between the hemispherical shoe 8 and the swash plate 3.
Lubricity between the sliding parts is achieved which avoids wear damage or seizure. That is, the release of refrigerant gas in the outer circumferential direction due to the rotational force of the swash plate 3 is compensated for by setting the refrigerant gas supply path in the vicinity of the accommodation recess 7a, and high lubrication performance is obtained.

Of course, the present invention is not limited to the above-mentioned embodiments. For example, as shown in FIG.
In contrast, an embodiment in which the suction port 10a is set on the rotational direction side of the swash plate 3 is also possible. Such a setting allows the lubricating oil to enter the clearance between the housing recess 7a and the hemispherical shoe 8 evenly.

Further, the present invention can also be applied to a compressor using a cam plate instead of a swash plate.

Effects of the Invention As detailed above, in the present invention, a suction passage communicating between the swash plate chamber and the cylinder pore is formed in the piston, and the suction port is set near the accommodation recess of the shoe, so that the refrigerant containing lubricating oil is A gas flow is generated in the vicinity of the housing recess, and this has the excellent effect of supplying sufficient lubricating oil to provide high lubricity to the sliding parts between the shoe, the housing recess, and the swash plate.

[Brief explanation of drawings]

FIG. 1 is an electrical cross-sectional view showing an embodiment embodying the present invention;
FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a sectional view of a road body showing another example. Cylinder block 1.2, diagonal diagonal 3, rotating shaft 4, cylinder bore 5, piston 6, swash plate passage groove 7, accommodation recess 7a,
Hemispherical shoe 8, swash plate chamber 9, suction passage 10, suction port 10a
0

Claims (1)

[Claims] 1. A swash plate compressor in which a shoe is interposed between a swash plate on a rotating shaft supported by a cylinder block and a piston housed in the cylinder block so as to be able to reciprocate,
An accommodating recess for fitting and accommodating the spherical portion of the shoe is formed in the end face of the swash plate passage groove of the piston, a suction passage communicating between the swash plate chamber and the cylinder bore is formed in the piston, and the suction port is connected to the accommodating recess. A swash plate compressor installed near the recess.