JPS6042231Y2 - Rotating swash plate compressor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotating swash plate compressor used in an automobile air conditioner.

In general, a rotating swash plate compressor is configured so that the piston reciprocates within the cylinder bore by the rotation of a swash plate that is fixedly mounted at an angle to the drive shaft, and performs compression in cooperation with the suction and discharge valves. A conventional example of this is shown in FIG.

In FIG. 1, a swash plate 2 is fixed to the drive shaft 1 at an angle.
A piston 4 fitted into the cylinder bore 3 is clamped so as to straddle the cylinder bore 3, and the piston 4 reciprocates within the cylinder bore 3 as the swash plate 2 rotates.

By this reciprocating movement of the piston 4, refrigerant is sucked into the cylinder bore 4 via a suction and discharge valve (not shown), compressed, and discharged.

Thrust bearings 5a are installed on both sides of the boss portion 2a of the swash plate 2.
, 5b are provided to receive the load in the thrust direction of the swash plate 2, and radial bearings are provided near both ends of the shaft insertion hole 6 into which the drive shaft 1 is inserted. a.

7b is provided so that the load of the drive shaft 1 in the radial direction can be received.

These thrust and radial bearings 5a, 5b, ?
As a refueling method for AT7B, an oil pump type equipped with an oil pump is generally used, but it has disadvantages such as being relatively expensive and requiring power for driving. Recently, especially thrust bearing 5
As a method of supplying oil to a and 5b, the one shown in the figure has been proposed.

That is, a main oil reservoir chamber 9 is provided below the swash plate chamber 8 in which the swash plate 2 is disposed, and a sub oil reservoir chamber 11 is formed in the rear cylinder head 10b at one end of the drive shaft 1. The oil reservoir chamber 11 and the main oil reservoir chamber 9 communicate with each other via an oil supply passage 12, and the drive shaft 1 is further formed with an oil supply hole 13 extending from the auxiliary oil reservoir chamber 11 to the thrust bearings 5a*5b. The lubricating oil stored in the main oil reservoir chamber 9 is sucked up into the auxiliary oil reservoir chamber 11 through the oil supply passage 12 due to the centrifugal force caused by the rotation of the drive shaft 1, and is transferred to the thrust bearing through the oil supply hole 13 of the drive shaft 1. 5a and 5b.

The auxiliary oil reservoir chamber 11 needs to prevent negative pressure from leaking to the extent that the lubricating oil is maintained at a certain level or higher. Therefore, in the past, a plain bearing was used, especially for the rear radial bearing 7b. needle-type ones could not be used.

Therefore, the drive shaft 1 and the radial bearings 7a, 7b
Since the contact area is large, there are drawbacks such as increased risk of seizure and shortened lifespan.

Therefore, in this invention, in order to eliminate the above-mentioned drawbacks, a bush against which the race plate of the thrust bearing comes into contact is provided in the shaft insertion hole to minimize the gap between the shaft insertion hole and the drive shaft, and the auxiliary oil reservoir chamber is Prevents negative pressure from leaking to the swash plate chamber,
This aims to provide a highly reliable rotating swash plate compressor that allows the use of needle-type radial bearings.

Examples of this invention will be described below with reference to the drawings.

2 and 3, one embodiment of this invention is shown, in which the drive shaft 1 is connected to a pair of cylinder blocks 14a, 14b.
A swash plate 2 is inserted into a shaft insertion hole 6 formed at the center of the drive shaft 1, and a swash plate 2 is fixedly attached to the drive shaft 1 at an angle.

The piston 4 is fitted into the cylinder bore 3 formed in the cylinder knobs 14a and 14b, and is connected to the poles 15a and 15b from both sides so as to straddle the periphery of the swash plate 2.
The swash plate 2 is sandwiched through 6a and 16b, and the swash plate 2
It reciprocates within the cylinder bore 3 as the cylinder rotates.

Front and rear cylinder heads 10a, 10b are fixedly mounted on both sides of the cylinder blocks 14a, 14b with valve plates 17a, 17b in between.

Suction and discharge valves (not shown) are provided on both sides of the valve plates 17a and 17b, and are opened and closed as the piston 4 reciprocates to perform a compression action.

The thrust bearings 5 a and 5 b are provided on both sides of the boss portion 2 a of the swash plate 2 and receive the load in the thrust direction of the swash plate 2 .

Further, the radial bearings 7a and 7b are of a needle type, and are provided near both ends of the shaft insertion hole 6, and receive the load of the drive shaft 1 in the radial direction.

The main oil reservoir chamber 9 is connected to the cylinder head 10a from the cylinder blocks 14a, 14b below the swash plate chamber 8 in which the swash plate 2 is arranged.
, 10b.

Further, the auxiliary oil reservoir chamber 11 is formed within the rear cylinder head 10b on the rear side of the drive shaft 1.

The main oil reservoir chamber 9 and the auxiliary oil reservoir chamber 11 are communicated with each other via an oil supply passage 12 formed in the rear cylinder head 10b.

In addition, in this embodiment, the auxiliary oil reservoir chamber 11 and the oil supply passage 1
2 is formed on the rear cylinder head 10b, but other embodiments include cylinder blocks 14a, 14b or a valve plate 17a.

17b.

The oil supply hole 13 is formed in the drive shaft 1, and includes an axial hole 13a that opens at one end on the rear side and extends in the axial direction, and this axial hole 13a.
Thrust bearings 5a, 5 are formed in the radial direction from
From the small holes 13b and 13c that open near b.

Therefore, when the drive shaft 1 rotates, the small holes 13b, 13
The inside of the shaft hole 13a becomes negative pressure due to the centrifugal force acting on the thrust bearings 5a and 5b.

The bushes 18a, 18b are approximately cylindrical, and are located on both sides of the thrust bearings 5a, 5b in the cylinder blocks 14a, 14b.
The thrust bearings 5a, 5b side are in contact with the outer race plate 19 of the thrust bearings 5a, 5b, and the bush 18 is fixed to the shaft insertion hole 6.
The drive shaft 1 is inserted inside the shafts a and 18b with a small gap.

Therefore, communication between the swash plate chamber 8 and the auxiliary oil reservoir chamber 11 is substantially blocked by the bushes 18a and 18b.

Note that the bushings 18a and 18b may be made of a bearing alloy so as to be in loose contact with the drive shaft 1. This further prevents leakage of the negative pressure in the auxiliary oil reservoir chamber 11, and also prevents the radial diameter of the drive shaft 1 from leaking. It can bear directional loads.

In the above configuration, when the drive shaft 1 is rotated, the swash plate 2 swings and rotates, the piston 4 reciprocates within the cylinder bore 3, and a compression action is performed in cooperation with suction and discharge valves (not shown).

The rotation of the drive shaft 1 creates a negative pressure in the oil supply hole 13, the auxiliary oil reservoir chamber 11, and the oil supply passage 12, and the lubricating oil stored in the main oil reservoir chamber 9 is transferred to the auxiliary oil reservoir chamber 11 through the oil supply passage 13. The thrust bearing 5a is sucked up and further passed through the oil supply hole 13.
, 5b for lubrication.

At this time, the sub oil reservoir chamber 11 and the swash plate chamber 8 are connected to the bush 18.
Since communication is substantially blocked, leakage of negative pressure in the sub-oil reservoir chamber 11 is prevented.

Therefore, radial bearings? Even if needle-type bearings are used for a and 7b, it is possible to ensure a sufficient supply of lubricating oil to the thrust bearings 5a and 5b.

In the above embodiment, the oil supply hole 13 of the drive shaft 1 is opened only near the thrust bearings 5a and 5b, and the oil supply hole 13 of the drive shaft 1 is opened only near the thrust bearings 5a and 5b. Although the lubricating oil to a and 7b is not shown, the lubricating oil from the sub oil reservoir chamber 11 is supplied to the rear radial bearing 7b, and the lubricating oil from the auxiliary oil reservoir chamber 11 is similarly supplied to the front radial bearing 7a near the radial bearing 7a. An opening for the oil supply hole 13 may be provided, or other means such as lubricating oil mixed in the suction refrigerant gas may be supplied.

As described above, according to this invention, in a rotating swash plate compressor that uses the centrifugal force of the drive shaft to supply oil to at least the thrust bearing, a bushing that comes into contact with the race plate of the thrust bearing is provided to drive the compressor. Since the gap between the shaft and the shaft insertion hole is small, leakage of negative pressure from the sub-oil reservoir chamber is prevented, and even when using a needle-type radial bearing, sufficient lubricating oil can be supplied to the thrust bearing. This makes it possible to improve reliability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional swash plate compressor, FIG. 2 is a sectional view showing a swash plate compressor of this invention, and FIG. 3 is an enlarged sectional view showing the main parts of the same. 1... Drive shaft, 2... Swash plate, 5a, 5
b... Thrust bearing, 6... Shaft insertion hole, 7a, 7b... Radial bearing,
Death: Swash plate chamber, 9: Main oil sump chamber, 11:
... Sub-oil storage chamber, 12 ... Oil supply hole, 18.
...butsu, 19...lace board.

Claims (1)

[Scope of utility model registration request] Radial bearings that receive the load in the radial direction of the drive shaft are provided near both ends of the shaft insertion hole into which the drive shaft is inserted, and bearings in the thrust direction of the swash plate are provided on both sides of the boss portion of the swash plate fixed to the drive shaft. A thrust bearing that receives a load is provided, and a main oil reservoir chamber formed below the swash plate chamber in which the swash plate is disposed and an auxiliary oil reservoir chamber formed at one end of the drive shaft are connected via an oil supply passage. In a rotary swash plate compressor, the rotary swash plate compressor is connected to the auxiliary oil reservoir chamber so that at least the thrust bearing is supplied with oil through an oil supply hole formed in the drive shaft. A rotary swash plate type compressor, characterized in that the shaft insertion hole is provided to minimize a gap between the shaft insertion hole and the drive shaft.