JPS5834307Y2 - Swash plate type compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a swash plate compressor used in automobile air conditioners and the like, and particularly relates to an improvement in its lubricating oil supply mechanism.

Conventional swash plate compressors have keyways cut into the surface of the shaft to provide passages for lubricating oil.

However, with the conventional structure of drilling a keyway in the shaft, the shaft is usually made of high-carbon steel that has been induction hardened and is extremely hard, so the cylindrical shaft must be milled or reamed. This required the use of an expensive processing method called trench metal drilling, leading to higher product costs.

Furthermore, by digging a groove in the shaft 1, the shaft 1
A problem has arisen in which the strength of the steel is reduced.

This invention was devised in view of the above-mentioned problems, and by forming a passage through which lubricating oil can pass through the race on the cylinder block side of the thrust bearing, it is easy to process, and the strength of the shaft can be improved. It is an object of the present invention to provide a swash plate compressor equipped with a lubricating oil supply mechanism that does not have any adverse effects.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a swash plate compressor according to the present invention applied to an air conditioner for an automobile will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a shaft, which is connected to an automobile engine serving as a driving source via an electromagnetic clutch (not shown), and is rotated by the driving force of the engine.

A swash plate 2 is fixed to the shaft 1 with a key and rotates together with the shaft 1. Rotation of the swash plate 2 causes a piston 5 to reciprocate through shoes 3 and balls 4.

A cylinder block 6 supports the reciprocating movement of the piston 5, and a housing 8 is fixed to both sides of the cylinder block with a pulp plate 7 interposed therebetween.

A suction chamber 8a is formed in the center of the housing 8, and the suction chamber 8a is located inside the housing 8.
A discharge chamber 8b is formed on the outer periphery of the discharge chamber 8b.

Then, the refrigerant gas vaporized by the evaporator (not shown) is introduced into the suction chamber 8a, and when the piston 5 is on the suction stroke, it passes through the suction port shown in the valve plate T and the suction valve into the cylinder block 6. I get sucked in.

Next, when the piston 5 moves to the compression stroke, the refrigerant gas in the cylinder block is discharged into the discharge chamber 8b via the discharge lower a in the valve plate 7 and the discharge valve (not shown).

This discharge chamber 8b communicates with a condenser (not shown), and sends the refrigerant gas, which has become high temperature and high pressure during the compression stroke of the piston 5, to the condenser.

Reference numeral 10 denotes a conventional ball bearing radial bearing, which has an outer race fixed to the cylinder block 6, and an inner race that rotatably holds the shaft 1.

Reference numeral 11 denotes a thrust bearing, which is located between the cylinder block 6 and the swash plate 2, and receives a force applied in the thrust direction (axial direction) of the swash plate 2, causing the swash plate 2 to reciprocate the piston metal. It supports the reaction force received when

The thrust bearings 11 are arranged radially between a swash plate side race 11a having a ring-shaped plate shape in contact with the swash plate 2 and a cylinder block side race 11b having a ring-shaped plate shape in contact with the cylinder block 6. It is formed by sandwiching the roller member 11cffi.

Here, as shown in FIG. 2, the cylinder block side race 11b of this thrust bearing 11
b' is the shaft 1 in order to prevent the generation of eccentric load due to eccentricity.
The inner circumferential surface 11 is fitted with three recesses a, b, and c at equal intervals of 120 degrees in the circumferential direction. The lubricating oil is allowed to flow through these recesses a, b, and c.

The molding of these recesses a, b, and c is the cylinder block side race 11bffi of the thrust bearing 11.
When punching and forming from a stainless steel plate using a press, it is punched and formed at the same time.

Reference numeral 12 denotes an oil chamber formed below the shaft 1, which is normally filled with lubricating oil.

Reference numeral 13 denotes a swash plate chamber formed in the swash plate rotating portion within this oil chamber 12, which communicates with the oil chamber 12 through a communication hole 13affi, and lubricating oil is kept between this swash plate chamber 13 and the oil chamber 12. You can come and go freely.

Reference numeral 13b indicates an abrasion powder drop hole for dropping abrasion powder 4 generated by the rotation of the swash plate 2;
3 and the oil chamber 12, it serves to allow lubricating oil to pass therethrough.

Note that there is a hole (not shown) above the swash plate chamber 13 that opens into the refrigerant atmosphere, and since the lubricating oil is mixed with the refrigerant and circulated through the refrigeration cycle, it is introduced through this hole (not shown). The lubricating oil directly lubricates the swash plate and also enters the swash plate chamber 13, so that the amount of lubricating oil in the oil chamber 12 is prevented from decreasing too much.

Reference numeral 14 denotes a shaft seal, which is located between the housing 8 located closer to the drive source of the housing 8 and the shaft 11 to prevent refrigerant gas and lubricating oil inside the compressor from leaking to the outside. and shaft 1
This shall maintain confidentiality between the parties.

Here, the flow of lubricating oil enters from the hole (not shown) above the swash plate chamber, lubricates the swash plate 2, shoes 3, balls 4, and pistons 5, and then lubricates the thrust bearing 11.
The flow reaching the shaft 1 from the gap between the races 11a and 11b and the member 11c (indicated by A in the figure) and the swash plate chamber 13
The lubricating oil inside is splashed upward in the figure by the rotational force of the swash plate 2, or moved upwards in the soil shown in FIG. After lubricating the ball 4, button and piston 5, the races 11a and 1 of the thrust bearing 11
1b and the flow reaching the shaft 1 from the gap with the member 11c (indicated by B in the figure); and the flow where the lubricating oil in the swash plate chamber 13 directly reaches the shaft 1 from the gap between the races 11a and 11b of the thrust bearing 11 and the member 11c. (C in the diagram
After reaching the shaft 1, most of the lubricating oil flows into the swash plate chamber 13.

Then, the remaining part is stored in the suction chamber because the pressure inside the suction chamber 8a becomes negative pressure due to the suction stroke of the piston 5, and a pressure difference occurs between the pressure around the swash plate and the pressure inside the suction chamber 8a. It is sucked up to 8a.

1. Some of the lubricating oil is installed in the cylinder block side race 11b of the thrust bearing 11 in the recesses a, b, and c.
e, it exits to the gap between the cylinder block 6 and the shaft 1, and further flows into the suction chamber 8a through the balls of the radial bearing 10 (shown in the figure).

At this time, the radial bearing 10 is lubricated.

In the embodiment of the swash plate compressor according to the present invention described above, recesses a, b, and c' (r) are provided in the cylinder head side race 11b of the thrust bearing 11 to serve as passages for lubricating oil, but this is not always necessary. However, the present invention is not limited to the recesses a, b, and c.

As another example, as shown in FIG. 3, the inner peripheral surface 11 of the cylinder block side race 11b of the thrust bearing 11
Hole a' on concentric circle near b' + 3 on b' + c'
They may be provided as lubricating oil passages by opening them at equal intervals of 1200 mm apart from each other in the circumferential direction.

Here, the holes a', t/, and c' are formed by drilling holes in the cylinder block side race 11b of the ring-shaped plate.

Further, the recesses a, b, and c according to the present invention are holes a/, b/
.

In the above example, the positions of C' were set 1200 degrees apart from each other to avoid eccentricity, but this is not a limitation that must be adhered to and may be changed if requested by others. good.

Further, recesses a, b, c or holes a/ according to the present invention.

b' and c' are not limited to three, but may be any number as long as they are one or more.

In that case, it is preferable to place recesses or keys at equally spaced positions to avoid eccentricity with the cylindrical block side race 11b of the thrust bearing 11, but if requested by others, recesses or keys should be placed. The layout of the hole positions may be chosen freely.

In the above explanation, the recess or hole is made only in the cylinder block side race 11b of the thrust bearing 11, but since the shapes of the cylinder block side 11b and the swash plate side race 11a are different, for example, it is difficult to assemble the cylinder block side race 11b. If it is inconvenient due to a problem in the mounting process, a recess or hole may be similarly provided in the swash plate side race 11a, and both races 11a, 11bk
It is better to have the same formation.

Further, in this embodiment, an example was explained in which the swash plate compressor according to the present invention was used in an automobile air conditioner, but the swash plate compressor according to the present invention can be widely used as a machine for compressing gas. It's not even 1.

As explained above, the swash plate compressor according to the present invention has a passage t for supplying lubricating oil around the swash plate 2 to the surface of the shaft 1, and is provided in the race 11b on the cylinder block side of the thrust bearing 11. Compared to the case where the keyway 1a is dug to form a passage through which lubricating oil flows, machining is much easier, and labor costs are therefore lower, making it possible to significantly reduce costs.

Furthermore, since the keyway 1ak is eliminated, an excellent effect can be obtained in that the strength of the shaft 1 can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a swash plate compressor according to the present invention. FIG. 2 is a front view of the cylinder block side race 11b of the thrust bearing 11 which is a main part of the lubricating oil supply mechanism of the swash plate compressor according to the present invention, and FIG. 3 is a front view of another cylinder block side race 11b according to the present invention. It is a front view showing an example. 1... Shaft, 2... Urn plate, 5... Piston, 6
... Cylinder block, 10... Radial bearing, 11... Thrust bearing, 11b... Cylinder block side race, 12... Oil chamber, a
,b. C... recess provided in the cylinder block side race 11b forming a passage through which lubricating oil passes, a/ , W ,
c/... A hole provided in the cylinder block side race 11b that provides a passage through which lubricating oil passes.

Claims (1)

[Scope of utility model registration request] A shaft that rotates by the driving force of a drive source, a swash plate that is fixed to this shaft and rotates together with the shaft, a piston that reciprocates within a cylinder block in response to the rotational force of this swash plate, and a piston that is fixed to the cylinder block. a radial bearing that rotatably holds the shaft; a thrust bearing that is located between the swash plate and the cylinder block and supports the axial force of the swash plate; and a thrust bearing that is located below the shaft. A swash plate type compressor, comprising: an oil chamber for storing lubricating oil, and a passage for supplying the lubricating oil around the swash plate to the shaft surface is provided in a fixed race on the cylinder block side of the thrust bearing.