JPS60138228A - Supercharger - Google Patents

Abstract

PURPOSE:To prevent the occurrence of wear in a metal end face in case of adopting a copper alloy metal as well as to aim at improvement in its durability, by installing a platelike washer interposingly between a radial metal housed in a bearing box of a supercharger and a circlip supporting this radial metal. CONSTITUTION:In order to stabilize its rotation in a radial direction, a supercharger having an ultrahigh speed turbine and a compressor is provided with a radial metal 6 inside a bearing box 5 and supported by a circlip 7, while a platelike washer 30 is interposingly installed in position between the radial metal 6 and the circlip 7. And, a lubricating oil film is secured in space between the radial metal 6 and the platelike washer 30 and thereby no wear is made so as to be produced at a metal end face even when the radial metal 6 is forcibly pressed to a thrust direction. With this constitution, such a copper alloy as being weak against mechanical cutting in spite of excellence in black and corrosion resistance capacity is adoptable for the radial metal 6, thus durability in the supercharger is yet more improvable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a supercharger having an extremely high-speed rotating turbine and compressor.

[Background of the invention]

The durability of a supercharger as disclosed in Japanese Utility Model Application Publication No. 50-149710 is greatly influenced by the amount of wear on the inner diameter and outer diameter of the radial metal. One of the factors that accelerates wear is blackening corrosion of radial metal, and as a countermeasure to this problem, copper alloys with excellent blackening corrosion resistance are being adopted. but,
This copper alloy is susceptible to pattern cutting, and when subjected to thrust in the thrust direction due to fluctuations in the turbine rotor assembly caused by minute imbalances in the turbine and compressor, the end face easily wears out. Occur.

This wear occurs because the radial metal end face is pressed against the circlip surface that supports the metal, and the circlip is structurally unable to retain a lubricating oil film.

[Purpose of the invention]

The purpose of the present invention is to provide a radial metal bearing structure that is essential for preventing radial metal end face wear and improving durability when a copper alloy metal with excellent blackening corrosion resistance is used in a turbocharger. There is a particular thing.

[Summary of the invention]

The % characteristic of the present invention is that in a full float type radial metal that stabilizes the radial rotation of an ultra-high-speed rotating supercharger, a plate washer is inserted between the radial metal end face wear and the circlip. However, there is no lubricating oil film on the metal end face17, which prevents wear on the end face.

[Embodiments of the invention]

In the drawing, exhaust gas 17 discharged from the engine is led to the turbine case 2 of the supercharger, drives the turbine 1,
It is discharged 18. Air is taken in 19 by a compressor 11 integrated with the turbine 1 and a compressor case 12, and supercharged air 20 is supplied to the engine. In order to support the radial movement of the turbine at high speed, two radial metals 6 are housed in the lpHl receiving box 5 by a circlip 7. In order to support movement in the thrust direction, the thrust metal 8 is pressed against the bearing box 5 by a thrust spring 1o inserted into a back plate 9.

Lubricant oil for the engine is supplied to the bearing box 6 from an inlet 21, lubricates the radial metal 6 and thrust metal 8, and is drained 22. Regarding leakage of lubricating oil to the outside of the supercharger, on the turbine side, piston ring 4. The compressor side is sealed by a seat ring 16 and a mechanical seal 15. Since the turbine rotates at high speed, when a slight unbalance occurs, the turbine 1 side casing or the compressor 11 side swings around, and the radial metal 6 is pushed in a determined thrust direction, causing the surface of the circlip 7 to A problem occurred where the end face of the radial metal was rubbed and worn. Jitsukai 50-149
Details of the radial metal part as disclosed in Japanese Patent No. 710 are shown in FIGS. 2 and 3. Circlip 7 is the second
The lubricating oil supplied from the engine is drained at the interrupted parts of the circlip, ensuring a rich oil film between the radial metal 6 and the circlip 7. I won't be able to do it.

Therefore, in the present invention, as shown in FIGS. 4 and 5, a lubricating oil film is secured between the radial metal 6 and the plate washer 30, and even when the radial metal is pressed in a certain thrust direction, this oil film prevents No wear occurs.

Turbine impeller 1. The vibration mode of the turbine rotor assembly is determined by the weight of the compressor impeller 11 and the maximum operating speed of the supercharger. As a result, end face wear of the radial metal 6 may occur at specific positions. For example, if wear occurs only on the outer end surfaces of the two radial metals, it may be possible to insert plate washers 30 at two locations on the outer side to block only those parts.

〔Effect of the invention〕

According to the present invention, when a copper alloy metal material with good machinability is used as a radial metal, by inserting the plate-shaped washer of the present invention between the radial metal and the circlip,
It is possible to prevent metal wear and improve the durability of the supercharger.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the turbocharger, FIG. 2 is a sectional view showing details of the radial metal part, FIG. 3 is a perspective view of the circlip, and FIG. 4 is a radial view of the turbocharger according to the present invention. FIG. 5 is a cross-sectional view showing details of the metal part, and FIG. 5 is a perspective view of the plate washer. 5...Bearing box, 6...Radial metal, 7...Circlip, 30...Washer agent Patent attorney Akio Takahashi Tank 2 diagram also 4-Figure 0 30 0

Claims (1)

[Claims] 1. The bearing box of the supercharger that supercharges the engine by the compressor that rotates together with the turbine driven by the exhaust gas emitted by the engine, the radial metal housed in the bearing box, and the radial metal. This patented supercharger includes a circlip that supports the radial metal and a plate washer inserted between the radial metal and the circlip.