JPH0311166A - Compressor - Google Patents

Abstract

PURPOSE:To improve the lubricity of a thrust bearing and prolong the life of a compressor by forming a communication passage from the swash plate chamber side of a cylinder at the outer peripheral part of the roller part between the thrust race of a cylinder side thrust bearing. CONSTITUTION:A hole 22 which communicates to a tilt chamber is formed at a place positioned on the outer peripheral part of a thrust bearing 20, onto a cylinder 16. The oil mixed with blow-bye gas lubricates the thrust bearing 20. A passage 24 for the passing through the center part of the thrust bearing 20 is formed, and an intake communication passage 26 to a low pressure chamber on an intake passage 28 side is formed on a rear cover. Thus, the lubricity of the thrust bearing is improved, and the life of the compressor is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubrication path for a variable capacity single swash plate compressor in an air conditioner for automobile air conditioning.

[Conventional technology]

In the conventional device, as described in 11 Japanese Patent Laid-Open No. 63-243468'', a thrust bearing is used to support the drive shaft of the variable capacity single swash plate in a freely rotatable manner to support the load in the thrust direction. However, the thrust bearings used on the cylinder side are not actively lubricated, resulting in poor lubrication due to the following reasons.

The above-mentioned cylinder side thrust bearing has a
A thrust load acts on a single swash plate compressor whose capacity is fixed at a minimum capacity of Occ/r6y or more, and when it becomes necessary to further reduce the capacity due to cycle balance. In this case, if lubricating oil is not supplied to the thrust bearing, flaking may occur.

[Problem to be solved by the invention]

The above conventional technology uses a thrust bearing that rotatably supports the load in the thrust direction of the drive shaft, and does not consider a means to actively lubricate the thrust bearing on the cylinder side, resulting in problems with poor lubrication such as flaking of the bearing. there were.

An object of the present invention is to actively supply lubricating oil to the cylinder-side thrust bearing.

[Means to solve the problem]

In order to achieve the above purpose, the suction passage (and discharge passage) and the swash plate chamber are basically separate spaces so that lubricating oil is stored in the swash plate chamber, and the swash plate chamber is made a part of the suction passage. are avoiding. Therefore, the swash plate chamber has a structure in which the lubricating oil that flows together with the blow-by gas between the piston ring and the cylinder bore and the oil sealed during assembly are stored. However, in order to prevent the pressure within the tilting chamber from increasing due to the blow-by gas, the suction chamber or suction passage and the tilting chamber are communicated through a thin tube serving as a pressure balance hole.

This pressure balance hole is basically used to prevent the swash plate chamber pressure from increasing due to blow-by gas.
The oil in the slant Fi chamber is sufficiently atomized by the rotation of the swash plate, etc.
Since it is almost uniformly mixed with the refrigerant gas, the lubricating oil flows from the balance hole in a mixed state with the refrigerant gas. For this reason, lubrication is improved by using the thrust race, which is the roller portion of the thrust bearing, as a part of the communication path between the swash plate chamber, which is the balance hole, and the suction chamber.

What is particularly important is to reduce as much as possible the oil that flows out to the suction chamber side along with the blow-by gas, and to effectively supply it to the rotating parts. For this reason, it is important that the blow-by gas to the thrust bearing be made to flow from the outer diameter side to the center side.

The reason for this is that there is a density difference between refrigerant gas and lubricating oil, and as the thrust bearing rotates, the rollers also rotate, and the refrigerant gas and oil that enter between the rollers adhere to the rollers, but the oil adheres to the rollers. Since the oil is then blown outward by centrifugal force, it contributes to the lubrication of the rollers, but the amount of oil that flows out through the center of the thrust bearing is kept to a minimum.

[Effect]

As mentioned above, by providing a communication path from the swash plate chamber side of the cylinder to the part of the cylinder-side thrust bearing where the relative speed is high, or in the case of a roller bearing, the outer periphery of the roller part between the thrust races, the thrust The lubricity of the bearing is improved, and lubrication defects such as flaking are significantly improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

It has a drive shaft 1 and a drive plate 3 that rotates at the same rotation speed as the drive shaft and transmits rotational force, and the drive plate is connected to a journal 5.

The journal is inclined with respect to the drive shaft, and is connected via a cam groove 7 provided in the drive plate so that the angle of inclination can be changed. The journal is fitted with a piston support 10 via a thrust bearing 8 and a deep groove ball bearing 9, converting the inclined rotation of the journal into a rocking motion of the piston support.

The rocking motion of the piston support causes the piston 14 to reciprocate through the connecting rod 12.

A piston reciprocates within the bore 15 of the cylinder 16 to perform compression work.

The inclination angle of the journal changes depending on the differential pressure before and after the piston. When the internal pressure of the bore sucked by the piston is small relative to the pressure behind the piston, a force is generated so that the stroke of the piston 14 becomes small, and this force is transmitted to the piston support 10 via the air rod, It acts to reduce the swing angle of the piston support. This force also reduces the inclination angle of the journal 5.

According to the inclination angle of the journal, the sleeve 17 fitted with the shaft 1 moves toward the cylinder, and the sleeve is regulated by a retaining ring 18 provided on the shaft that regulates the minimum capacity, and the inclination angle of the journal is also regulated to the minimum capacity. Stroke is regulated. If the minimum stroke is larger than necessary for the air conditioner system, even if the minimum stroke is regulated, a differential pressure will act before and after the piston, so the entire shaft will be pushed toward the cylinder side, and a load will be applied to the cylinder side thrust bearing 20. . In order to actively supply lubricating oil to the thrust bearing even in such cases, a hole 22 that communicates with the inclined chamber is drilled in the cylinder at a location located on the outer periphery of the thrust bearing so that the oil mixed with the blow-by gas can be supplied to the thrust bearing. It is designed to lubricate the parts. In order to allow this proby gas to flow due to the differential pressure between the swash plate chamber and the low pressure passage, a Gup is provided between the thrust race and the shaft as a passage 24 to pass through the center of the thrust bearing, and a gap is provided between the thrust race and the shaft. A hole is provided in the center of the head and the DV plate gasket, and a suction communication passage 26 to the low pressure chamber on the suction passage 28 side is provided in the rear cover. In this way, by creating a differential pressure heating path from the outer circumferential side to the center of the thrust bearing, the lubricating oil along with the blow-by gas enters between the rollers 23 of the thrust bearing and adheres to the rollers, and as the rollers 23 revolve, Since it is pushed out to the outer circumference by centrifugal force, the amount flowing out from the center of the thrust bearing to the low pressure side is reduced, making it possible to effectively use the lubricating oil in the swash plate chamber.

This structure improves the lubrication of the thrust bearing and extends the life of the compressor.

〔Effect of the invention〕

According to the present invention, the lubricity of the thrust bearing on the cylinder side is improved, so the life of the compressor is improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention. 1... Drive shaft (shaft), 3... Drive plate. 5... Journal (swash plate), 7... Cam groove, 8...
・Thrust bearing, 9...Deep groove ball bearing, 10...
・Piston support, 12...Conrod, 14...
·piston. 15...Cylinder bore, 16...Cylinder, 17.
... Sleeve, 18 ... Retaining ring, 19 ... Minimum spring, 20 ... Thrust bearing, 21 ... Spring, 22 ... Cylinder communication passage, 23 ... Thrust bearing (roller), 24 ...Communication passage, 26...Suction communication passage, 28...Suction passage ≧-

Claims (1)

[Scope of Claims] 1. A cylinder having a plurality of bores, a piston that reciprocates within the cylinder bore, and an inclined plane that is connected so that the piston can reciprocate and that rotates together with a drive shaft located at the center of the cylinder. It has an F cover that includes a plate (journal) and the swash plate, and the inclination angle of the swash plate changes depending on the differential pressure before and after the piston, and there is a thrust bearing that supports the thrust direction of the drive shaft. , in a compressor in which the thrust bearing is located in the center of the cylinder and is not surrounded by a space (swash plate chamber) formed between the F cover and the cylinder, the thrust bearing is connected to an outer peripheral portion of the thrust bearing from a tilt plate chamber; A compressor characterized by having a passage. 2. The compressor according to item 1, wherein the center of the thrust bearing communicates with a low pressure chamber including a low pressure passage into which refrigerant is introduced into the compressor.