JPS5949322A - Shaft sealing device of supercharger - Google Patents

Abstract

PURPOSE:To enable the supply of the proper amount of lubricating oil to a sealed end surface, to prevent the occurrence of wear and seizure, and to improve a sealing ability and durability, by providing notch grooves in the side end surface of a driven ring making contact with the side end surface of a seat ring to form a sealed end surface. CONSTITUTION:Notches 16 are formed in 3 positions on the outer peripheral part of a side end surface 10c of a driven ring 10. The proper amount of lubricating oil in a cover 15, which is sprayed to a case end part 9b by a seat ring 2, is guided through the notches 16 to a sealed end surface 14 acting as a sliding end surface to lubricate and cool the sliding part of the sealed end surface 14. In consideration of thickness of an oil film, the notches 16 are provided in a plurality of spots at equal intervals. Additionally, the size of the notches 16 is properly selected depending upon the amount of oil fed to the sealed end surface 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a shaft sealing device for a supercharger.

FIG. 1 shows a cross-sectional view of a compressor side shaft sealing device of a conventional turbocharger shaft sealing device. In Fig. 1, 1 is a shaft that is driven by a shaft having a turbine driven by exhaust gas from a prime mover and has a stepped portion 1a with a large and small diameter portion formed on the housing side, and 2 is a shaft that has a stepped portion 1a of the shaft 1. A seat ring formed of carbon or the like fitted on the small diameter side; 3 is the small diameter side of the shaft 1;

The shaft 1, the seat ring 2, and the compressor impeller 4 are pressed into contact with the compressor impeller 4 which is fitted into the shaft 1 and fixed to the shaft 1.
This is a spacer that is rotated together with the spacer.

Reference numeral 5 denotes a groove provided in the axially intermediate portion of the outer periphery of the seat ring 2, and a thrust bearing 8 is pressed against the housing 7 by the urging force of a thrust spring 6 pressed by a cover 15 fixed to the housing 7. is inserted to restrict the movement of the shaft 1.

On the other hand, a side end surface 10c of a driven ring 10 provided in a case 9 having a substantially U-shaped cross section and press-fitted into a cover 15 fixed to the housing 7 is pressed into contact with a side end surface 2a of the seat ring 2 to form a sealed end surface. The lubricating oil is prevented from leaking within the cover 15 which forms a lubricating oil for lubricating the bearing portion. A seal ring 11 is disposed within the case 9 to seal the small diameter portion 10a of the driven ring 10 and the small diameter inner wall 9a of the case 9.

Reference numeral 12 designates a washer member, which press-fits the seal ring 11 into the small-diameter portion 10a of the driven ring 10 and the small-diameter inner wall 9a of the case 9 by a spring 13 installed in the case 9, thereby sealing between the small-diameter portion 10a and the small-diameter inner wall 9a. At the same time, the side end surface 10C of the driven ring 10 is pressed against the side end surface 2a of the seat ring 2 to form a sealed end surface 14. Driven ring 1 by cover 15, case 9, spring 13, etc.
0 to the sea 1-IJ song.

As shown in the cross-sectional view of the driven ring 10 in FIG. 2 and in the front view in FIG. 3, the side end surface 10G that makes sliding contact with the side end surface 2a of the seat ring 2 has a circular shape with an inner diameter of d1 and an outer diameter of do. It is formed into a ring shape, and its end face is configured to be a smooth surface. Generally, the rotation range of a supercharger is up to 100,0
00rT)m or more, the circumferential speed of the seal sliding part is 0 to 1
It is difficult to provide optimal lubricant to the sliding parts over the entire operating range, which is as wide as 50m/sea. That is,
When the inner diameter side (d, side) of the driven ring shown in FIG. 2 is in a dry state, wear is increased and the sliding surface of the seat ring 2, which is a mating material, is also worn, resulting in poor sealing performance.

This reduced durability. In addition, 10d is the driven ring 10
It is a rotation stopper.

The present invention has been made in view of the above circumstances, and provides a shaft sealing device for a supercharger that can prevent wear and seizure of the sliding surfaces between the driven ring and the seat ring and improve sealing performance and durability. It is intended for this purpose.

The shaft sealing device for a supercharger of the present invention is driven by a shaft having a turbine driven by exhaust gas from a prime mover, and has a step portion forming large and small outer diameter portions on the housing side, and a compressor impeller on the small diameter side. A fixed shaft, a seat ring that is fitted into the small diameter side of the shaft and is pressed by a driven ring, and is formed so as to contact and fix the stepped portion for airtight sealing, and a seat ring that is pressed by a ring pressing means and driven to rotate. the driven ring that slides in pressure contact with the seat ring; a cover that contains lubricating oil that lubricates the bearing and is sealed and fixed to the upper housing; a case that is press-fitted and fixed to the cover; and a case that is installed within the case. and the ring suppressing means comprising a spring that presses the driven ring and the seal ring that seals between the cases and presses the back surface of the driven ring,
A lubrication notch or groove is provided on the side end surface of the driven ring that comes into sliding contact with the seal ring.

Hereinafter, the shaft sealing device for a supercharger of the present invention will be explained with reference to FIG. 4 using one embodiment, and the same parts as those of the conventional art are designated by the same reference numerals, and the explanation of the structure of the same parts is omitted. FIG. 4 shows a sectional view of the same part as FIG. 1, and in FIG. 4, the side end surface 10 of the driven ring 10
As shown in detail in FIGS. 5 and 6, C is provided with notches 16 at three locations on the outer periphery. Therefore, an appropriate amount of the lubricating oil inside the cover 15, which has been scattered by the seat ring 2 on the case end 9b, etc., is guided to the sealed end surface 14, which is the sliding end surface, through the notch 16. lubricate and cool the parts. It is desirable that the notches 16 be provided at a plurality of locations at equal intervals in consideration of the thickness of the oil film. Further, the size of the notch 16 needs to be appropriately selected depending on the amount of oil introduced to the sealed end surface 14.

In this way, the shaft sealing device of the turbocharger of this embodiment has a cutout groove on the side end surface of the driven ring that contacts the side end surface of the seat ring and forms a sealed end surface, so that an appropriate amount of lubricating oil is supplied to the sealed end surface. This enables lubricant cooling, prevents wear and seizure, and improves sealing performance and durability.

7, 8, 9, and 10 show other embodiments of the side end surface 10c of the driven ring 10, respectively. The difference from the above embodiment is that the above embodiment has a cutout 16 on the outer circumferential side of the side end surface 10 to guide lubricating oil to the sealed end surface 14, whereas the embodiment shown in FIGS. 7 and 8 , arc-shaped $17 with both ends communicating are formed at four equally spaced locations on the outer circumferential side. Further, in the embodiments shown in FIGS. 9 and 10, an annular groove 17 is formed in the intermediate part of the inner and outer periphery of the side end surface 10C, and the embodiments shown in FIGS. Both examples have the same effects as the above embodiments. Furthermore, Figure 9,
In the embodiment shown in FIG. 10, the groove 17 does not communicate with the outer periphery.
Conventionally, lubricating oil sometimes flows into the side end face 10C partially, so by providing the groove 17, it is possible to smoothly lubricate the sealed end face 14 over the entire surface.

As described above, the shaft sealing device for a supercharger of the present invention has the effect of preventing wear and seizure of the sliding surfaces of the seat ring and the driven ring, and improving sealing performance and durability.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional turbocharger shaft sealing device, Figure 2 is a sectional view of the driven ring in Figure 1, Figure 3 is a front view of Figure 2,
Figure 4 is a sectional view of the same part as in Figure 1 of the embodiment of the shaft sealing device for a turbocharger of the present invention, Figure 5 is a sectional view of the driven ring in Figure 4, and Figure 6 is the same part as in Figure 5. The front view, FIG. 7, FIG. 8, FIG. 9, and FIG. 10 respectively show other embodiments of the shaft sealing device for a supercharger according to the present invention, and FIG. 7 and FIG. 9 show a cross section of the driven ring. figure,
FIGS. 8 and 10 are front views of FIGS. 7 and 10, respectively. DESCRIPTION OF SYMBOLS 1... Shaft, 1a... Step part, 2... Seat ring, 4... Compressor impeller, 7... Housing,
9...Case, 10...Driver ring, 1oc...
Side end surface, 11...Seal ring, 13...Spring, 15...Cover, 1 mouth 121 20th 1θ Luo 40 Chia 5th'' $2 Figure 1 Otsuya 7 Figure 0 8th eye/'7 10tL Kayaq Figure 0 10th lθd

Claims (1)

[Claims] 1. A shaft that is driven by a shaft that has a turbine that is driven by exhaust gas from the prime mover, has a step part that forms a large and small outer diameter part on the housing side, and has a compressor impeller fixed on the small diameter side, and the small diameter of the shaft. a seat ring that is fitted into the side and pressed by the driven ring to contact and fix the stepped portion for airtight sealing; and the driven ring that slides in pressure contact with the seat ring that is pressed and rotationally driven by the ring pressing means. a cover that contains lubricating oil for lubricating the bearing and is sealed and fixed to the housing; a case that is press-fitted to the cover; and a seal ring that is installed inside the case and seals between the driven ring and the case. and the ring suppressing means consisting of a spring that presses against the back surface of the driven ring and presses the back surface of the driven ring, characterized in that a lubrication notch or groove is provided on the side end surface of the driven ring that comes into sliding contact with the seal ring. A shaft sealing device for a turbocharger.