JPS6123674Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in a lubricating oil supply mechanism for a radial bearing that supports a drive shaft in a so-called rotary swash plate compressor.

In a so-called rotary swash plate type compressor, in which a piston engaged with the swash plate reciprocates as the swash plate mounted on the drive shaft rotates to compress air or gas, the radial bearing that pivotally supports the drive shaft is used. There were two types of lubricant supply mechanism: an oil pump type and a splash type.

The oil pump type lubricating oil mechanism has a gear pump, trochoid pump, or other dedicated pump for supplying lubricating oil inside the cylinder block, and this pump forcibly sucks up the lubricating oil from the oil reservoir below the cylinder block. This will be sent to the department. However, since oil pumps are expensive, it has not been possible to provide an inexpensive compressor.

The splash-type lubricating oil supply mechanism uses a swash plate or vane that rotates as the drive shaft rotates to splash lubricating oil from an oil reservoir provided below the cylinder block and turn it into oil mist. Due to the pressure difference generated, the lubricant is sent from between the drive shaft and the shaft insertion hole of the drive shaft to the bearing portion of the drive shaft, thereby lubricating the bearing portion. However, immediately after the compressor starts, the reciprocating movement of the piston does not generate enough pressure difference, so not enough lubricating oil is sent to the bearings, which is one of the causes of accidents such as seizure. was.

This invention was developed in order to eliminate the lack of lubrication of the bearings immediately after startup in the above-mentioned splash-type lubricant supply mechanism. This was created by focusing on the use of the lubricating oil contained in this refrigerant gas.A passage is formed that communicates from the cylinder bore to the radial bearing that supports the drive shaft, and the passage allows the refrigerant gas to By introducing the lubricating oil contained in the radial bearing into the radial bearing to lubricate the bearing, smooth lubrication immediately after startup is possible, and the structure is simple and inexpensive. The present invention aims to provide a lubricating oil supply mechanism.

Next, an embodiment of this invention will be described with reference to the drawings.

1 and 2, a rotating swash plate compressor equipped with the lubricating oil supply mechanism of this invention is shown,
The cylinder block 1 has a cylindrical shape, and a cylinder head 3 is fixed to the end thereof with a valve plate 2 interposed therebetween.The cylinder block 1 has a shaft insertion hole 4 in the center and three holes arranged at equal angles around the shaft insertion hole 4. cylinder bores 5a, 5b, 5c are formed, and three fan-shaped chambers 6a, 6b, 6c are formed in the cylinder bores 5a, 5b, 5c.
5b and 5c are formed at equal angles, the upper chambers 6a and 6b of the fan-shaped chambers are used as discharge or suction passages, and the lower chamber 6c is used as an oil reservoir 7.

A drive shaft 8 is inserted into the shaft insertion hole 4 , and the drive shaft 8 is rotatably supported by a radial bearing 10 in a radial bearing portion 9 formed at the end of the shaft insertion hole 4 .

A swash plate 11 is fixedly attached to the drive shaft 8 and arranged in a swash plate chamber 12 that communicates with an oil reservoir 7 formed in the cylinder block 1, and is rotated as the drive shaft 8 rotates. Thrust bearings 13, 13 are interposed between the boss portion 11a of the swash plate 11 and the cylinder block 1.

A piston 14 is fitted into a cylinder bore 5a formed in the cylinder block 1 so as to be able to reciprocate, and this piston 14 engages with the swash plate 11 via ball bearings 15, 15 and shoes 16, 16. has been done.

Therefore, when the drive shaft 8 is rotated, the swash plate 11 is also rotated, and the piston 14 is moved into the cylinder bores 5a, 5.
b, 5c, and cooperates with suction and discharge valves (not shown) formed in the valve plate 2 to perform a pumping action. As the swash plate 11 rotates, the oil in the oil reservoir 7 is twisted up to lubricate the swash plate 11, the piston 14, the thrust bearings 13, 13, the radial bearing 10, and the like.

A passage 17 is formed in the cylinder block 1 so as to communicate between the cylinder bore 5a and the radial bearing part 9, and a part of the refrigerant gas passes through the passage 17 when pressurized, and the radial bearing part 17 is connected to the radial bearing part along with the lubricating oil mixed therein. 9.

In the thus constructed rotating swash plate type compressor, when the drive shaft 8 rotates, the swash plate 11
When the piston 14 rotates, the piston 14 reciprocates in the cylinder bore 5a, drawing in the refrigerant gas containing the lubricating oil into the cylinder bore 5a, compressing it, and discharging it. At that time, a part of the refrigerant gas in the cylinder bore 5a that has been compressed and has become high pressure is sent together with the lubricating oil mixed therein through the passage 17 to the radial bearing 9 by the refrigerant pressure, and the lubricating oil sent thereto lubricates the inside of the radial bearing 9.

Therefore, since the lubricating oil is sent to the radial bearing part 9 when the compression action starts, the lubricating oil can also be quickly sent to the radial bearing part 9 and the thrust bearings 13, 13 even immediately after the compressor is started. It is possible.

In this embodiment, the passage 17 is provided so that the cylinder bore 5a and the radial bearing portion 9 communicate with each other, but the passage 17 is not limited to this, and may be provided so as to communicate with the other cylinder bores 5b and 5c. Good too.

Another embodiment of this invention is shown in FIG. 3, in which an oil reservoir 18 is formed at the outlet on the radial bearing section 9 side of a passage 17 that communicates the cylinder bore 5a and the radial bearing section 9. By temporarily storing lubricating oil in the radial bearing portion 9, a shortage of lubricating oil to the radial bearing portion 9 can be prevented.

FIG. 4 shows an enlarged cross-sectional view of a rotary swash plate compressor in which the drive shaft is supported by a metal bearing and is equipped with the lubricating oil supply mechanism of the invention as still another embodiment of the invention. ing.

A ring-shaped metal bearing 18 is arranged in the radial bearing part 9 formed at the end of the shaft insertion hole 4. The outer surface of the metal bearing 19 is fixed to the cylinder block 1, and the drive shaft 8 is fixed to the inner surface. It is rotatably supported.

A hole is bored in the metal bearing 19 and the cylinder block 1 to form a passage 17. The passage 17 communicates the cylinder bore 5a and the radial bearing part 9, so that a part of the refrigerant gas in the cylinder bore 5a flows through the cylinder bore 5a. The radial bearing portion 9 is guided together with the lubricating oil mixed therein.

In FIG. 5, an embodiment is shown in which the metal bearing rotary swash plate compressor is provided with an oil reservoir.
A groove-shaped oil reservoir 18 is formed in the rotation direction of the
This oil reservoir 18 communicates with the passage 18, and similarly to the embodiment shown in FIG. It is preventable.

As described above, according to this invention, in a rotary swash plate compressor, a passage is provided that communicates the radial bearing portion that bears the drive shaft with the cylinder bore, and the refrigerant gas and the lubricant contained therein are transmitted from the passage. Since oil is supplied to the radial bearing, lubricating oil can be immediately supplied to the radial bearing even immediately after startup, so it is possible to provide a rotary swash plate compressor that does not cause seizure or the like.

Further, since it is only necessary to provide an existing rotary swash plate compressor with a passage that communicates the radial bearing portion and the cylinder bore, the structure is extremely simple and inexpensive, and it can be implemented immediately using an existing compressor.

Furthermore, since an oil reservoir is formed at the outlet on the radial bearing side of the passage that communicates the radial bearing and the cylinder bore, lubricating oil can be stored in the oil reservoir to prevent a lack of lubricating oil to the radial bearing. It is possible.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of this invention; Figure 1 is a sectional view of a radial bearing type rotary swash plate compressor equipped with a lubricating oil supply mechanism of this invention; FIG. 3 is an enlarged sectional view showing an embodiment in which an oil reservoir is formed in the rotary swash plate compressor, and FIG. 4 is a lubricating oil supply mechanism of this invention. FIG. 5 is an enlarged sectional view of a metal bearing type rotary swash plate compressor having an oil reservoir. FIG. 1... Cylinder block, 4... Shaft insertion hole, 5
a, 5b, 5c...Cylinder bore, 9...Radial bearing portion, 10...Piston, 17...Passage, 1
8...Oil pool.

Claims (1)

[Claims for Utility Model Registration] 1. A plurality of cylinder bores 5 around the shaft insertion hole 4
Cylinder block 1 forming a, 5b, 5c
, a cylinder head 3 fixed to the end thereof via a valve plate 2, a drive shaft 8 supported by a bearing fitted into a radial bearing portion 9 formed at the end of the shaft insertion hole 4; A swash plate 11 fixed to the drive shaft 8 and arranged in the swash plate chamber 12 of the cylinder block 1, and a plurality of swash plates engaged with the swash plate 11 and fitted into the cylinder bores 5a, 5b, 5c so as to be reciprocally movable. In a rotary swash plate type compressor having a piston 14, the plurality of cylinder bores 5
A passage 17 communicating between the cylinder bore and the radial bearing portion 9 is formed in at least one of the cylinder bores a, 5b, and 5c, and a portion of the compressed refrigerant gas in the cylinder bore due to the reciprocating motion of the piston 14 is passed through the passage 17. A lubricating oil supply mechanism for a compressor, characterized in that the lubricating oil is led to a radial bearing part 9. 2. Utility model registration claim 1, characterized in that the bearing fitted into the radial bearing part 9 is a radial bearing 10, and the passage 17 communicates with an oil reservoir 18 formed in the radial bearing part 9.
A lubricating oil supply mechanism in the compressor described in 2. 3. The compressor according to claim 1 of the utility model registration claim, characterized in that the bearing fitted into the radial bearing portion 9 is a metal bearing 19, and the passage 17 is formed passing through the metal bearing 19. Lubricating oil supply mechanism.