JPS63239314A - Lip sealing device for turbocharger - Google Patents

Abstract

PURPOSE:To obtain a high sealing performance and also aim at reduction of the cost of manufacture by providing a retainer, through which the turbine shaft of a turbocharger penetrates, with a lip, coming into contact with the turbine shaft. CONSTITUTION:A retainer 1, which is attached to the housing of a turbocharger so as to constitute a part thereof, partitions a compressor chamber 2 on its left side and a bearing chamber 3 on its right side together with the housing. In the central part of the retainer 1 is provided a through hole 4, into which a turbine shaft 5 penetrates and extends, and at the same time, on the bearing chamber 3 side end face of the retainer 1 is provided a cylindrical recessed part 6 coaxially with the through hole 4. And then, into the recessed part 6 is pressed a cylindrical spacer 7 so that it is fixed there and caused to hold the outer periphery part of a lip 8. The inner periphery part of the lip 8 is curved towards the bearing chamber 3 side so as to come in sliding contact with the outer periphery surface of the turbine shaft 5 so that a high sealing effect can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a lip seal device, and particularly to a lip seal device suitable for use in a turbocharger.

``Prior Art'' Conventionally, as a seal device on the compressor side of a turbocharger for an automobile, a non-contact type lip seal device (Japanese Patent Application Laid-Open No. 11424-1982) or a contact-type mechanical seal device (Japanese Patent Application Laid-Open No. 1988-11424) has been used. No. 80628) is used.

``Problems to be Solved by the Invention'' In general, the non-contact type lip seal device described above has poor sealing performance, but has good responsiveness, that is, the ability to follow the increasing rotation speed of the turbocharger as the engine speed increases. On the other hand, contact-type mechanical seal devices, on the other hand, tend to have good sealing performance but poor responsiveness, so we developed a sealing device for turbochargers that has excellent sealing performance and responsiveness and can be manufactured at low cost. The development of

"Means for Solving the Problems" In view of such circumstances, the present invention provides a retainer through which a turbine shaft of a turbocharger is rotatably penetrated, a recess formed in the retainer around the turbine shaft,
a lip having an outer peripheral part accommodated in the recess 1 and an inner peripheral part slidingly contacting the outer peripheral surface of the turbine shaft; and a spacer fitted in the recess to fix the outer peripheral part of the lip to the retainer. A lip seal device for a turbocharger is provided.

``Operation'' With such a configuration, it is possible to obtain performance that is almost the same as a mechanical seal device in terms of sealing performance, and superior performance than a mechanical seal device in terms of responsiveness, although it is not as good as a lip seal device. Moreover, since the structure is simple, it can be manufactured at low cost.

``Embodiment'' The present invention will be described below with reference to an illustrated embodiment. In FIG. 1, a retainer 1 that is attached to and constitutes a part of a housing of a turbocharger (not shown) has a compressor chamber 2 on the left side thereof together with the housing. , a bearing chamber 3 is formed on the right side.

A through hole 4 is bored in the shaft portion of the retainer 1, and a turbine shaft 5 passing through the through hole 4 on the same axis is rotated by a bearing (not shown) in the bearing chamber 3. It is freely pivoted. and turbine shaft 5
A compressor impeller (not shown) is attached to the left end located in the compressor chamber 2, and the other end passes through the bearing chamber 3 and projects into the turbine chamber, and a turbine wheel is attached to the projecting end.

A cylindrical recess 6 is formed concentrically with the through hole 4 on the end surface of the retainer 1 on the side of the bearing chamber 3. A cylindrical spacer 7 is press-fitted into the recess 6. The outer periphery of the lip 8 is held between the retainer 1 and the lip 8.

In this embodiment, an annular projection 7a is formed on the outer circumference of the spacer 7 and projects toward the inner wall end surface of the recess 6. Set a predetermined amount smaller than
The axial dimension of the outer peripheral surface of the spacer 7 is made to match the axial depth of the recess 6.

The outer circumferential portion of the lip 8 is held between the inner circumferential surface of the protrusion 7a and the outer circumferential surface of the lip 8 with a required gap, and the inner circumferential portion faces the bearing chamber 3 side. It is curved and in contact with the outer circumferential surface of the turbine shaft 5 or the outer circumferential surface of a sleeve 9 that rotates integrally with the turbine shaft 5 .

In the above configuration, when assembling the turbocharger,
The turbine shaft 5 is pivotally supported in a housing (not shown), and the sleeve 9 is attached thereto, and the retainer 1 is attached to the housing. After the inner circumferential portion of the lip 8 is evenly brought into close contact with the outer circumferential surface of the sleeve 9 and the axis of the sleeve 9 is aligned with the center of the lip 8, the outer circumferential portion of the lip 8 is positioned within the recess 6 of the retainer 1. Then, the spacer 7 is press-fitted until the projection 7a of the spacer 7 comes into contact with the end surface of the inner wall of the recess 6.

At this time, since a required gap is formed between the inner circumferential surface of the protrusion 7a and the outer circumferential surface of the lip 8, the center of the lip 8 does not shift from the axis of the sleeve 9, and the protrusion Since the protrusion amount IL1 of the lip 7a is set to be smaller than the thickness IL2 of the lip 8 in its natural state by a predetermined amount, the lip 8 can be attached with the outer peripheral portion compressed by the necessary amount.

Therefore, it is possible to prevent the lip 8 from rotating, and to ensure good sealing performance in that part, and also to prevent the lip 8 from being compressed more than necessary, which would reduce its durability. can. Furthermore, by providing the protrusion 7a, the press-fit length of the spacer 7 can be increased by that amount compared to the case where the protrusion 7a is omitted. The directional dimension can be shortened.

Note that the inner circumferential surface of the protrusion 7a and the lip 8 may be
A sealing member such as an O-ring is provided in the gap between the outer peripheral surface of the
It is possible to ensure even more reliable sealing performance.

When we tested the sealing performance and responsiveness of the lip seal device with the above configuration, we found that the sealing performance was superior to that of conventionally known lip seal devices, and the performance was almost the same as that of mechanical seal devices. I was able to get it. Also, although it is not as responsive as a lip seal device, it is about 20 times more responsive than a mechanical seal device.
We were able to achieve an improvement of more than %.

Next, FIG. 2 shows another embodiment of the present invention. Whereas in the above embodiment, the lip 8 is directly attached to the retainer 1 by means of a spacer 7, in this embodiment, the lip 8 is attached directly to the retainer 1. is attached to the case 10 by the spacer 7, and this case 10
is attached to the retainer 1.

That is, the case 10 is formed into a ring shape, and a cylindrical recess 11 is formed on the end surface on the side of the bearing chamber 3 concentrically with the through hole 4, and in the state before the lip 8 is assembled, as shown in FIG. As shown by the imaginary line, it is constructed as a ring-shaped member with a cross-sectional shape.

An annular groove 1 is formed on the inner wall end surface of the recess 11.
After the seal member 13 is housed in the case 10, the outer circumference of the lip 8 is housed in the recess j1, and the outer circumference of the lip 8 is held between the spacer 7 having the protrusion 7a. Caulk 10a and attach spacer 7 to case I
It is fixed integrally to O. Further, a stepped portion 14 is formed at the outer circumferential corner of the case 10, a seal member 15 is fitted thereto, and then the case 10 is press-fitted into the recessed portion 6 of the retainer 1.

It is clear that in this embodiment as well, by appropriately setting the amount of protrusion of the protrusion 7a, an appropriate amount of compression of the lip 8 can be ensured, and the same effects as in the above embodiment can be obtained. be.

Note that in this embodiment, the spacer 7 is secured by caulking.
Although the spacer 7 is fixed to the case 10, it can be fixed by press-fitting the spacer 7 into the recess 11 of the case 10 as in the previous embodiment.
3.15 may be omitted.

Furthermore, another embodiment of the invention shown in FIG. 3 is provided with two lips 8.8, with the lip 8.
and spacer 7, and in this state are press-fitted into a recess 16 formed in the retainer 1 and having a depth twice that of the recess 6 described above.

In addition, as another example related to FIG. 3, the above case 1
It is clear that two sets of lips 8 and spacers 7 can also be provided superimposed within the spacer 0;
As shown in the figure, the recess 16 of the retainer 1 in FIG.
The spacer 7 located on the inside of the recess 16 is divided into a radially outer cylindrical protrusion portion and an inner ring-shaped portion, and the cylindrical portion is separated from the protrusion 7a of the spacer 7 on the outside of the recess 16.
It is also possible to have a structure in which they are integrally connected. It goes without saying that the configuration shown in FIG. 4 can also be adopted in the case 10 in which two sets of lips 8 and spacers 7 are provided one on top of the other.

"Effects of the Invention" As described above, according to the present invention, it is possible to provide a lip seal device for a turbocharger that is superior in both sealing performance and responsiveness compared to conventional devices, and furthermore, the lip seal device Since it has a simple structure and is easy to assemble, it can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the invention, and FIGS. 2 to 4 are sectional views showing other embodiments of the invention. 1...Retainer 4...Through hole 5...Turbine shaft 6.1], 16...Recess 7...-Spacer 7a...Protrusion 8...Lip 1
0-...Case Figure 1 Figure 2 Figure 3 Figure 4

Claims (4)

[Claims] (1) A retainer having a turbine shaft of a turbocharger rotatably passed through it, a recess formed in the retainer around the turbine shaft, an outer peripheral portion accommodated in the recess, and an inner peripheral portion of the turbine shaft. 1. A lip seal device for a turbocharger, comprising: a lip that is in sliding contact with an outer circumferential surface; and a spacer that is fitted into the recess and fixes the outer circumference of the lip to a retainer. (2) The lip seal device for a turbocharger according to claim 1, wherein the recess is formed in a case that is integrally attached to the retainer. (3) A protrusion is formed on the outer periphery of the spacer that protrudes toward the inner wall end surface of the recess, and the amount of protrusion of this protrusion is set to be smaller than the thickness of the lip in its natural state by a predetermined amount. A lip seal device for a turbocharger according to claim 1 or 2. (4) A plurality of sets of the lip and a spacer for fixing the lip are arranged one on top of the other, according to any one of claims 1 to 3. lip seal device for turbochargers.