JPH0618630U - Bearings / shaft seals for turbochargers - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of assembly steps for turbochargers. [Structure] The thrust bearing 18 and the oil drainer 15 are
The oil defense plate 20 is integrated.
The oil defender plate 20 has a shape capable of holding the oil drainer 15, and the outer peripheral portion thereof is fixed to the thrust bearing 18 by press fitting or caulking. The oil drainer 15 is attached to the end of the turbine shaft 6 on the compressor side, and the thrust bearing 18 is attached to the bearing housing 3 for assembly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing / shaft seal device used at a compressor-side end of a turbine shaft in a turbocharger.

[0002]

[Prior art]

 In the turbocharger of the intermediate support bearing type, as shown in an example in FIG. 3, the turbine housing 1 and the compressor housing 2 are integrally structured through the bearing housing 3, and the turbine wheel 4 in the turbine housing 1 and the compressor housing 2 are The compressor wheel 5 is connected by a turbine shaft 6 which is rotatably supported by a journal bearing in the bearing housing 3, and the turbine wheel 4 is rotated by the exhaust gas of the engine, whereby the compressor wheel 5 is compressed. The wheels 5 are rotated to compress the intake air and supply the engine.

Since the turbine shaft 6 of the turbocharger rotates at a high speed, it is necessary to lubricate the journal bearing portion. Therefore, conventionally, the turbine shaft penetrating portion of the bearing housing 3 is circumferentially and radially lubricated. A bearing fitting ring 8 having a bearing 7 is incorporated, and floating metal 9 and 10 having an oil supply hole 11 in the radial direction are rotatably fitted to both ends in the axial direction of the bearing fitting ring 8 as the above journal bearings to form a bearing. The lubricating oil supplied through the oil supply passage 12 provided in the housing 3 is guided to the inner and outer peripheral surfaces of the floating metals 9 and 10. Reference numeral 13 indicates a retaining ring.

Further, an oil drainer 15 having an uneven surface is provided at the compressor-side end of the turbine shaft 6 located in the bearing housing 3, and a seal ring 16 is fitted to the outer surface of the oil drainer 15. Then, the seal plate 17 whose inner peripheral surface is in contact with the seal ring 16 is attached to the bearing housing 3 via the oil defender plate 20 to form a shaft sealing portion, and further, the oil drain 15 and the thrust bush 14 are formed. A thrust bearing portion is provided by disposing a thrust bearing 18 having a dedicated oil supply passage 19 communicating with the oil supply passage 12 of the bearing housing 3 between the surface on the compressor side and the thrust bearing portion. It is used as a positive thrust (thrust in the direction in which the turbine shaft 6 tends to move to the compressor) bearing surface, and is located on the turbine side of the oil drainer 15. The surfaces are anti-thrust (thrust in the direction in which the turbine shaft 6 tends to move toward the turbine) bearing surfaces, and these thrust bearing surfaces are lubricated by the lubricating oil coming out from the dedicated oil supply passage 19 of the thrust bearing 18. Is done. In the drawing, 21 indicates an oil drain port of the bearing housing 3.

[0005]

[Problems to be solved by the device]

 However, in the turbocharger described above, the thrust bearing portion for receiving the thrust force of the turbine shaft 6 and the shaft sealing portion for performing the oil seal on the compressor side are indispensable. Parts such as the bush 14, the thrust bear ring 18, the oil defender plate, and the oil drainer 15 must be assembled in order with high accuracy, which causes a problem that many man-hours are required for assembling.

Therefore, the present invention is intended to provide a bearing / shaft seal device for a turbocharger, which can reduce the number of steps for assembling the turbocharger.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a thrust bearing which is attached to the end of the bearing housing that integrates the turbine housing and the compressor housing on the compressor side to receive the thrust force of the turbine shaft, and the outside thereof. In the oil defender plate, the oil drainer mounted on the turbine shaft has a shape capable of holding the oil drainer and is fixed to the outer surface of the thrust bearing by press fitting or caulking. The configuration will be integrated.

Further, the oil drainer and the thrust bush facing the inner surface of the thrust bearing may be integrally molded to form a thrust spacer.

[0009]

[Action]

 Since the thrust bearing, the oil drainer, and the oil defender plate are integrated, these parts can be assembled at once and the assembly man-hours can be reduced.

Further, if the oil drainer and the thrust bush are integrated into a thrust spacer, it is possible to further reduce the number of assembling steps.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In a bearing / shaft seal device used as a thrust bearing portion and a shaft seal portion of a turbocharger having a structure similar to that shown in FIG. 3, a turbine shaft 6 The thrust bearing 18 for receiving the thrust force of the above and the oil drainer 15 for mounting on the turbine shaft 6 on the outer side thereof are arranged adjacent to each other coaxially, and the oil drainer 15 is held. The stepped oil defense plate 20 is arranged on the outer surface of the thrust bearing 18, and the outer peripheral portion of the oil defender plate 20 is bent and crimped from the outer peripheral surface of the thrust bearing 18 to the inner surface. As a result, the thrust bearing 18, the oil drainer 15, and the oil defender plate 20 are integrated like a cassette. Further, the oil defense plate 20 and the thrust bearing 18 are provided with mounting holes 20a and 18a at required locations on the outer peripheral portion, so that the bearing housing 3 can be mounted with screws 22. As a method of fixing the oil defender plate 20, instead of caulking, the outer peripheral portion of the oil defender plate 20 may be pressed into the outer peripheral surface of the thrust bearing 18.

When assembling the bearing housing 3, the thrust bushing 14 is attached to the end of the turbine shaft 6 on the compressor side, and the thrust bearing 18 is opposed to the thrust bushing 14. After fitting 15 onto the turbine shaft 6, the screw 22 is inserted into the oil defense plate 20 and the mounting holes 20a and 18a of the thrust bearing 18 to fix the thrust bearing 18 to the end surface of the bearing housing 3.

In the above description, since the thrust bearing 18, the oil drainer 15, and the oil defender plate 20 are integrated cassettes, compared to the case where the thrust bearing portion and the shaft seal portion are assembled in sequence one by one. As a result, the assembly work can be performed extremely easily, which can reduce the number of assembly steps for the entire turbocharger.

Next, FIGS. 2A and 2B show another embodiment of the present invention. In the configuration similar to that shown in FIG. 1, the oil drainer 15 and the thrust bearing 18 are The thrust spacer 23 is integrally formed with the thrust bush 14 facing the side surface. In addition, the thrust bearing 18 is provided with a notch 18c at a part thereof so as to be fitted laterally to the small-diameter outer peripheral portion of the thrust bush 14 of the thrust spacer 23 and to dispose the shaft hole portion 18b. It is shaped like a horseshoe as shown in.

In the case of the embodiment of FIG. 2, since the thrust bush 14 is also integrated, the man-hours for assembling the turbocharger can be further reduced.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[0018]

[Effect of device]

 As described above, according to the bearing / shaft seal device for a turbocharger of the present invention, since the thrust bearing, the oil drainer, and the oil defender plate are integrated by using the oil defender plate, The assembly work can be done easily and the man-hours for assembling the turbocharger can be reduced. Also, by integrating the thrust bush, the man-hours for assembling the turbocharger can be further reduced. Exert the effect.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a bearing / shaft sealing device for a turbocharger of the present invention.

FIG. 2 shows another embodiment of the present invention, in which (a) is a schematic sectional view and (b) is a schematic side view of a thrust bearing.

FIG. 3 is a schematic diagram showing an example of a turbocharger.

[Explanation of symbols]

 1 Turbine housing 2 Compressor housing 3 Bearing housing 6 Turbine shaft 14 Thrust bush 15 Oil drainer 18 Thrust bearing 20 Oil defender plate 23 Thrust spacer

Claims (2)

[Scope of utility model registration request] 1. A thrust bearing which is attached to a compressor-side end of a bearing housing that integrates a turbine housing and a compressor housing to receive a thrust force of a turbine shaft, and is mounted on the turbine shaft outside the thrust bearing. The oil drainer to be held is formed into a shape capable of holding the oil drainer, and is integrated with an oil defender plate that is press-fitted or caulked to the outer surface of the thrust bearing. Characteristic turbocharger bearing / shaft seal device. 2. The bearing / shaft seal device for a turbocharger according to claim 1, wherein an oil drainer and a thrust bush facing the inner surface of the thrust bearing are integrally molded to form a thrust spacer.