JPH0379558B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a lubricating device for a rotary sleeve that is rotatably fitted into a center housing of a rotary compressor and rotates together with vanes. This rotary compressor with a rotary sleeve is suitable for use in internal combustion engines, in particular in superchargers for automobile engines.

<Prior art> A vane-type rotary compressor in which a rotating sleeve is supported by compressible fluid such as air can be used from low to high speeds because the rotating sleeve rotates with the vane and prevents heat generation and wear caused by sliding of the vane tip. It can be said that this is the most suitable supercharger for automobile engines, etc., which are operated at a wide range of rotation speeds up to. However, during startup, the pressure in the air bearing chamber formed between the inner peripheral surface of the center housing and the outer peripheral surface of the rotating sleeve is low and the rotating sleeve cannot be supported sufficiently.
The rotating sleeve moved to one side and came into direct contact with the center housing, causing scuffing at the contact point, which could result in poor rotation of the rotating sleeve. Additionally, when the compressor is in operation, due to the high internal pressure on the discharge side, if the rotating sleeve approaches the discharge side and comes into direct contact with the center housing, scuffing may occur at the contact point, which may result in poor rotation of the rotating sleeve. Ta.

<Problem of the Invention> An object of the present invention is to provide a rotary sleeve lubrication device for a rotary compressor that is effective in preventing direct contact between the rotary sleeve and the center housing.

<Technical means for achieving the object> As a technical means for achieving the object, the device of the present invention is embedded in either or both of the surface of the side housing that faces the vane and both end surfaces of the rotating sleeve. Equipped with self-lubricating material.
While the compressor is rotating, the vanes and rotating sleeve move in the axial direction and come into contact with the side housing, but since the contact is made through their respective self-lubricating materials, each time they make contact, wear particles are dispersed and a small amount is deposited on the center. The air flows into the bearing chamber between the housing and the rotating sleeve. Abrasion powder of this self-lubricating material adheres to the inner peripheral surface of the center housing and the outer peripheral surface of the rotating sleeve, forming a lubricating film, and when the rotating sleeve approaches the center housing, it interposes between them and rolls, preventing direct contact between the two. Therefore, scuffing due to direct contact is prevented.

<Example> The apparatus of the present invention will be described based on an example shown in the drawings. As shown in FIG. 1, the rotation axis 12 of the rotor 10 is connected to the front and rear side housings 2
Bearings 18 and 19 of 1 and 23,
A pulley 14 that receives rotational drive from the engine is attached to the front shaft end. A vane 16 is fitted into the vane groove 15 of the rotor 10 so as to be freely removable and removable, and the tip of the vane 16 is in contact with the inner circumferential surface of the rotating sleeve 30. A rear cover 24 is fixed to the back surface of the rear side housing 23 via a gasket, and a discharge chamber 41 and a suction chamber 51 are provided in the rear cover. The discharge chamber 41 communicates with the discharge side working chamber through the discharge hole 42, and the suction chamber 51 communicates with the suction side working chamber through the suction hole 52. The center housing 22, the front and rear side housings 21, 23, and the rear cover 24 are fastened together via bolts 27. Rotating sleeve 30 and center housing 2
An air bearing chamber 40 is formed between the two. A self-lubricating material 29 mainly composed of carbon or resin is embedded in both end surfaces of the rotating sleeve 30 and the inner surfaces of the front and rear side housings 21 and 23. Third
As shown in the figure, the front side housing 21
A plurality of rod-shaped self-lubricating materials 29 are arranged radially symmetrically about the axis. Although not shown,
The self-lubricating material embedded in the rear side housing is also exactly the same as that of the front side housing.

As shown in FIG. 2, a rotor 10 of a rotary compressor
is integrally fixed to the rotating shaft 12, and the rotating sleeve 3
It rotates in the direction of the arrow at the eccentric position of 0. Although the figure exaggerates the thickness of the air bearing chamber 40 between the rotating sleeve 30 and the center housing 22, the actual thickness is very thin, less than 0.1 mm. The two adjacent vanes 16 form working chambers 53, 43 on the suction side and the discharge side, and the pressure in the working chambers increases as it moves from the suction side to the discharge side. It reaches its maximum just before it communicates with the discharge chamber via. Rotating sleeve 30
A plurality of small disc-shaped self-lubricating materials 29 are arranged at equal arc intervals on the end face of the disc. Instead of embedding a plurality of small discs of self-lubricating material in the end faces of the rotating sleeve, a single annular self-lubricating material 29 may be embedded in both end faces of the rotating sleeve 30, as shown in FIG.

During rotation of the illustrated compressor, the vanes 16 and the rotating sleeves 30 move in the axial direction and come into contact with the front and rear side housings 21 and 23. Since the self-lubricating material is embedded, each time there is contact, wear particles are dispersed and flow into the air bearing chamber 40 between the center housing 22 and the rotating sleeve 30 little by little. Abrasion powder of this self-lubricating material adheres to the inner circumferential surface of the center housing and the outer circumferential surface of the rotating sleeve to form a lubricating film, and the rotating sleeve 30 is attached to the center housing 22.
When approached, it interposes between them and rolls, preventing direct contact between the two.

<Effects of the Invention> As described above, in the device of the present invention, the abrasion powder of the self-lubricating material embedded in the rotating sleeve and the side housing is dispersed within the air bearing chamber and prevents linear contact between the rotating sleeve and the center housing. Compared to conventional devices where there is no wear powder of self-lubricating material in the air bearing chamber, it has an excellent effect in preventing malfunction of the rotating sleeve and scuffing between the rotating sleeve and the center housing caused by direct contact. play.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a rotary compressor equipped with a device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a view showing the inner surface of the front side housing. , FIG. 4 is an end view of the rotating sleeve. 10: Rotor, 16: Vane, 21: Front side housing, 22: Center housing,
23: Rear side housing, 29: Self-lubricating material, 30: Rotating sleeve.

Claims (1)

[Claims] 1. A rotary compression device comprising a rotary sleeve rotatably fitted to a center housing, a rotor that rotates by bearing on a side housing at an eccentric position of the rotary sleeve, and a vane fitted to the rotor so as to be removable and removable. A rotary sleeve lubrication device for a rotary compressor, characterized in that a self-lubricating material is embedded in one or both of a surface of the side housing that contacts the vane and both end surfaces of the rotary sleeve.