JPS6345550Y2 - - Google Patents

Description

[Detailed description of the invention] [Subject of the invention and its field of application] The invention includes a rotating shaft having a turbine wheel located in the exhaust passage at one end and a compressor wheel located in the intake passage at the other end. The present invention relates to a turbocharger that is supported on a housing via a bearing and has an inlet formed in the housing for supplying lubricating oil to the bearing portion, and is used to increase the engine output of a vehicle or the like.

[Prior art]

As the above-mentioned type of turbocharger, for example, one described in Japanese Patent Application Laid-open No. 176418/1983 is already known. In this type, an inlet for supplying oil is formed in the housing in order to supply lubricating oil to the bearing portion of the rotating shaft supported on the housing via the bearing. Generally, an oil supply union is screwed into this inlet, and oil in the oil pan is supplied from the inlet to the bearing section through the union for lubrication.

[Problems with conventional technology]

In the conventional technology described above, even if an oil filter is disposed upstream of the union, lubricating oil is directly supplied from the union to the bearing section via the inlet, so the union is screwed into the inlet. There is a risk that foreign matter such as chips that may be generated during the process may be mixed into the lubricating oil, and there is also a risk that foreign matter such as casting sand or chips may remain in the union or pipe during the initial stage of assembly. Foreign objects may get caught in the bearing, causing the bearing to lock up and cause the bearing to seize. In particular, in an automobile turbocharger, the bearing portion is formed with a minute clearance of several tens of microns, so there is a risk that the above-mentioned disadvantages may be caused by the slightest foreign matter. Note that the above-mentioned disadvantages also occur when the oil filter on the upstream side of the union becomes clogged.

[Technical issues]

Therefore, the technical problem of the present invention is to prevent foreign matter from entering the bearing part and improve the durability of the bearing part.

[Technical means and their effects]

In order to achieve the above technical problem, the present invention provides an oil supply union that is screwed onto an inlet and has an inner end facing a stepped portion formed in the inlet, and an inner end of the union of the stepped portion of the inlet. The oil filter has a non-porous outer peripheral portion sandwiched by the stepped portion of the inlet and the inner end of the union, and a non-porous flat portion in the center thereof. The annular portion is formed between the non-porous flat portion and the outer peripheral non-porous portion and has a large number of small holes and is curved into a concave shape. Therefore, in the present invention, since the non-porous outer peripheral part of the oil filter is sandwiched between the inner end of the union and the stepped part of the inlet, even when the union and inlet are screwed together, chips etc. Even if foreign matter occurs, these foreign matter will not be transmitted to the bearing, and foreign matter may remain in the union or pipe, or the oil filter installed upstream of the union may become clogged. However, an oil filter disposed between the union and the inlet prevents foreign matter from being transmitted to the bearing section.

〔effect〕

Since the oil filter of the present invention described above has a non-porous flat part in the center, the flow of lubricating oil is blocked by the part and the flow velocity is reduced.
Since the oil is scattered around the flat part, the oil flow can be guided to the small hole annular part with a large collection area around the flat part, improving the ability to collect foreign substances. Since the annular portion in which the many small holes are arranged between the flat portions is curved in a concave manner, the area for collecting foreign matter is increased accordingly. Therefore, it has the effect of improving collection performance compared to a plate-shaped filter in which small holes are simply arranged.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 3 show a first embodiment of the present invention, in which a turbocharger 10 includes a turbine housing 13 having an exhaust inlet 11 and an exhaust outlet 12 for an exhaust passage for engine combustion gas, and an air inlet 14 for an engine intake passage. and a compressor housing 16 having a pressurized air outlet 15;
A housing 21 supports a rotating shaft 19 via a floating radial bearing 20, which has a turbine wheel 17 located in the exhaust passage of the turbine housing 13 at one end and a compressor wheel 18 located in the intake passage of the compressor housing 16 at the other end. have Thrust bushes 23 and 24 are fixedly disposed on the small diameter portion of the rotating shaft 19 by screws 22 via the compressor wheel 18. A rotating shaft 19 is located between the thrust bushes 23 and 24.
A thrust bearing 25 is provided for this purpose.
26 is the oil partition plate, 27 is the thrust bush 2
This is a seal plate disposed between the intermediate housing 21 and the outer periphery of the housing 21 via an O-ring. The radial bearing 20, whose leftward movement is restricted by the thrust bush 23, has its right end on the turbine wheel side facing the large diameter portion of the rotating shaft 19, and also functions as an axial bearing for the rotating shaft 19. . The boss portion 28 formed in the intermediate housing 21 is formed with an inlet 30 having a stepped portion 29 through which lubricating oil is supplied. , 32, 33, 34, bearing 20
The rotating shaft 19 is connected through passages 35 and 36 formed in the
and is supplied to the bearing portion of the radial bearing 20 and returned from an outlet 37 formed in the housing 21. The lubricating oil that has reached the passage 33 is supplied between the thrust bushes 23 and 24 that rotate together with the rotating shaft 19 and the thrust bearing 25 through passages 38 and 39 formed in the thrust bearing 25, and after lubricating the space between them, Reach outlet 37. The oil partition plate 26 functions as a guide plate that prevents the lubricating oil from reaching the seal plate 27 and returns it to the outlet 37.

An oil supply union 41 having an inner end 40 facing the stepped portion 29 is screwed into the inlet 30, and an oil filter 42 is sandwiched and supported between the stepped portion 29 and the inner end 40. The oil filter 42
As is clear from FIGS. 2 and 3, the stepped portion 29
and an outer peripheral non-porous portion 43 sandwiched between the inner end 40 and the inner end 40.
, a non-porous flat part 44 at the center thereof, and both parts 4
It consists of an annular part 45 which is arranged between 3 and 44 and has a large number of small holes (60 meshes or less) and is curved into a concave shape. The bottom surface of the inlet 30 of the intermediate housing 21 has a concave portion 46 having a shape corresponding to the annular portion 45 of the oil filter 42 by having a protrusion in which the passage 31 is formed. In addition, even if foreign matter is still mixed in the oil that has passed through the filter 42, it is shaped so that it can remain in the recess 46. A passage 47 is formed in the union 41, and this passage 47 is connected to an oil pan via a pipe or the like.

FIG. 4 shows a modification of the present invention, which differs from the previous embodiment only in that a permanent magnet 50 is fitted in the center of the oil filter 42a to form a non-porous flat surface. Further, the modification of the present invention shown in FIG. 5 differs from the above-described embodiment in that a permanent magnet 51 is disposed in the recess 46 of the inlet 30. Therefore, in these modified examples, chips and the like in the lubricating oil are absorbed by the magnet 50,
51 and is not transmitted to the bearing section.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a turbocharger oil filter showing one embodiment of the present invention, and Fig.
3 is an enlarged view of the oil filter in FIG. 1, FIG. 4 is a view similar to FIG. 3 showing a modification of the present invention, and FIG. 5 is a modification of the present invention. FIG. 10...Turbo charger, 17...Turbine wheel, 18...Compressor wheel, 19
... Rotating shaft, 20 ... Radial bearing, 25
...Thrust bearing, 30...Inlet,
41...Union, 42...Oil filter.

Claims (1)

[Scope of utility model registration request] A rotary shaft having a turbine wheel located in an exhaust passage at one end and a compressor wheel located in an intake passage at the other end is supported on the housing via a bearing, and a lubricating oil is provided in the bearing portion formed in the housing. an oil supply union having an inner end screwed onto the inlet and facing a stepped portion formed in the inlet; an oil filter sandwiched between the oil filter and the inner end of the union; and a non-porous flat section in the center thereof; An oil filter for a turbocharger, which comprises an annular part that is curved into a concave shape and has a large number of small holes between the non-porous flat part and the peripheral non-porous part.