JPH04104135U - Turbocharger thrust collar - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of this invention is to be able to adapt to subtle and uneven thermal deformation in the radial direction of the thrust collar of a turbocharger, and to prevent seizure even on the inner diameter side where lubrication conditions are particularly poor. , and to provide a thrust collar for a supercharger that can withstand a lot of wear on the inner diameter side. [Structure] The surface has a hardened layer with a uniform thickness, and on top of that, a layer of material that wears easily is thickened on the inner diameter side, and the corners are rounded at the position that communicates with the oil groove of the thrust bearing on the inner diameter side. It is characterized by having one or more grooves along the circumference.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a thrust collar for a supercharger.

0002

[Conventional technology]

FIG. 3 shows a conceptual diagram of a conventional engine supercharger. 1 is a thrust collar and an exhaust valve. It is installed on the bin turbocharger shaft, and the thrust surface is hardened. 2 is a thrust bearing Most bearing metals are white metal, but some are surface hardened. Figure 4 shows the above-mentioned FIG. 2 is an enlarged front view of the bearing 2. FIG. 7 is the tapered land part, 8 is the oil groove, and 9 is the oil supply hole at the front. It opens into the oil groove 8 and supplies engine system oil in a branched manner. Figure 5 shows thrust bearing FIG. 2 is a developed view of the BB cross section of the cylindrical surface of No. 2; When the turbocharger rotates, the lubricating oil in oil groove 8 is absorbed by the oil supply pressure and the rotation of the thrust collar. The taper land portion 7 and lubricates between the thrust bearing 2 and the thrust collar.

0003

[Problem that the idea aims to solve]

In engine superchargers, the thrust collar rotates at 20,000 to 30,000 rpm, so The oil supplied by the thrust bearing tends to be insufficient inside the thrust collar due to centrifugal force. As the temperature rises, the oil film becomes thinner. Also, due to sludge contamination of the oil itself. As the oil film becomes thinner, the lubrication conditions become even worse. Therefore, as shown in Figures 6 and 7 a. As shown in the figure, it is said that strong contact and streaks may occur on the inner diameter side of the thrust collar, resulting in seizure. There are drawbacks.

0004 The purpose of this invention is to eliminate the above-mentioned drawbacks and to improve the subtle uniformity of the thrust collar in the radial direction. It can be applied to thermal deformation without seizure, and it does not seize even on the inner diameter side with particularly poor lubrication conditions. It is an object of the present invention to provide a thrust collar for a supercharger that can withstand a lot of wear on the inner diameter side.

[0005]

[Means to solve the problem] The thrust collar of the turbocharger of this invention has a hardened layer of uniform thickness on the surface, and A thick layer of material that is easily worn is provided on the inner diameter side, and it also passes through the oil groove of the thrust bearing on the inner diameter side. It is characterized by having one or more grooves with rounded corners along the circumference at positions where the corners are rounded.

[0006]

【Example】

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. Figure 1 is an example of the present invention. FIG. 2 is an enlarged view of the surface of the thrust collar shown in FIG. In Figure 2 02 is a concave circumferential groove provided on the inner diameter side, and the corners are rounded. This circumferential groove is provided on the inner diameter side of the oil groove of the mating thrust oil holder. 03 is the front A surface hardening layer is provided with a uniform thickness on the thrust surface of the thrust collar 1. . 04 is made of an easily abraded material such as a nickel graphite layer, and the surface hardness layer The inner diameter side is thickly applied on top of 03 by melt spraying, and the surface is a plane perpendicular to the center line of the shaft. It has become.

[0007] Next, the operation of the above embodiment will be explained. Groove 02 distributes the lubricating oil supplied to the oil groove of the thrust bearing uniformly around the entire inner circumference. Because it is sharpened, it can withstand flows caused by centrifugal force even when the shaft rotates quickly. It can supply oil and improve internal lubrication. Nickel graphite layer 03 is abray Since it is double, the parts that hit hard will wear out and prevent seizure. Also thrust The temperature of the collar is uneven in the radial direction, and it can become localized and cause burn-in. There is a small area where the nickel graphite layer 04 wears out quickly and becomes damaged. This can prevent burn-in. The inner diameter side of the thrust collar has poor lubrication conditions. However, since the nickel graphite layer 04 is thicker on the inner diameter side, This wear can be accommodated.

[0008]

[Effect of the idea]

A groove with rounded corners that communicates with the oil groove of the thrust bearing is placed on the inner diameter side of the thrust collar. Since it is installed along the side, the lubricating oil is evenly distributed on the inner diameter side, and the thrust surface is A thick abradable layer is provided on the inner diameter side on top of the hardened layer, which prevents a lot of wear on the inner diameter side. It withstands slight thermal deformation in the radial direction, wears out, hits, and seizes. This allows it to adapt to slight uneven thermal deformation in the radial direction, and to prevent lubrication. Turbocharger thrust that does not seize even under bad conditions on the inner diameter side and can withstand heavy wear on the inner diameter side Colors can be provided.

[Brief explanation of drawings]

[Fig. 1] Conceptual diagram of a thrust collar according to an embodiment of this invention

[Figure 2] Enlarged sectional view of the thrust collar in Figure 1

[Figure 3] Conceptual diagram of engine supercharger

[Figure 4] Front view of conventional thrust bearing

[Figure 5] Developed cross-sectional view of a conventional thrust bearing using a cylindrical surface

[Fig. 6] Illustration of the drawbacks of the conventional thrust collar

[Figure 7] Front view corresponding to Figure 6

[Explanation of symbols]

01 Thrust color 02 Groove 03 Hardened layer 04 Nickel graphite layer 8 Oil groove 9 Oil supply hole 2 Thrust bearing

Claims (1)

[Scope of utility model registration request] [Claim 1] A hardened layer with a uniform thickness is provided on the surface, and a layer of material that is easily worn is provided thickly on the inner diameter side, and the corner is rounded at the position that communicates with the oil groove of the thrust bearing on the inner diameter side. A thrust collar for a supercharger characterized by having one or more grooves along the circumference.