JPS5856338Y2 - Oil drain device for turbocharger bearing - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a hydraulic device for a supercharger bearing.

Since the turbine shaft of a supercharger rotates at high speed, it is necessary to forcibly supply lubricating oil to the bearings and thrust bushes that support the turbine shaft.

However, the pressure at the back of the turbocharger's blower fan may become negative depending on the operating range of the blower's rotational speed, and in that case, oil may be absorbed into the blower through a small gap. Oil mist may be included in the air discharged from the blower, which causes various problems in terms of performance and maintenance of the supercharger and engine.

Therefore, conventionally, as shown in Fig. 1, an oil cylinder ring C having a disc-shaped protrusion g is provided on the side that contacts the thrust collar h of the blower fan wheel fitted on the turbine shaft a. In many cases, a groove is provided in the cylindrical portion between the fan wheel and the fan wheel, into which one or two seal rings d of the same diameter are inserted, and this seal ring is brought into contact with the non-rotating partition wall e.

Of these, the shaft, fan wheel, and thrust collar oil cylinder ring rotate as one.

As a result, a part of the oil supplied to the thrust bearing part f is blown away by the centrifugal force of the disc protrusion of the oil cylinder ring, but the rest is transmitted along the surface of the oil cylinder ring and is further removed by the seal ring provided at the end. Leakage is prevented.

However, there is a slight gap between the seal ring and the same groove, so when there is back pressure on the back of the blower fan wheel, oil may leak through this gap to the blower side. An important condition for effective oil sealing is to minimize the amount of oil that reaches the seal ring.

However, the drawback of the conventional structure is that once the oil is not blown away by the disc part of the oil ring and is transmitted to the surface of the oil ring, the oil is lost due to the difference in centrifugal force because this part is a cylinder with the same diameter. It is difficult to reduce the amount of oil leakage beyond a certain level because the oil will not be able to be shaken off and will continue to move to the seal ring.

The present invention was made with the aim of eliminating the above-mentioned drawbacks of the conventional means.The present invention was made with the aim of eliminating the above-mentioned drawbacks of the conventional means. An oil cylinder ring is fitted between the back side of the blower fan wheel of the turbine shaft and the thrust bushing so that it can rotate integrally with the turbine shaft, and the oil cylinder ring is fitted so that it can rotate integrally with the turbine shaft. A large diameter part and a small diameter part are provided on the outer periphery, and a disc-shaped projection having a diameter larger than the outer diameter of the large diameter part or the small diameter part of the oil cylinder ring is provided at the thrust bush side end of the oil cylinder ring. , the oil cylinder ring is characterized in that a seal ring is attached to the large diameter part and the small diameter part of the oil cylinder ring so as to be in contact with the air vent chamber and the air handling chamber contact plate.

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

In the figure, 1 is a turbine shaft, 2 is a thrust bush, 3 is a bearing, 4 is a bearing chamber, 5 is an oil cylinder ring, and 6 is a blower fan. Turbine shaft 1, thrust bush 2, oil cylinder ring 5
, the blower fan wheel 6 can rotate integrally.

A disk-shaped projection 7 with the largest outer diameter is provided on the outer periphery of the oil cylinder ring 5 on the side that is in contact with the thrust bushing 2. Following the projection 7 is a large diameter portion, and following the large diameter portion, a disk-shaped projection 7 is provided. The narrow diameter portions are respectively provided toward the blower side and have a stepped shape.

Seal rings 8 and 9 are fitted around the outer peripheries of the large diameter part and the small diameter part of the oil barrel ring 5, respectively.
An air handling chamber contact plate 10 is in contact with the seal ring 9, and an air vent chamber 11 is in contact with the seal ring 9, respectively.

In the figure, 12 is an oil cylinder groove provided in the oil cylinder ring 5, 13 is an oil supply hole provided in the thrust bearing, and 14 is an air vent chamber 11.
This is the gap provided between the fan wheel 6 and the blower fan wheel 6.

When the blower fan wheel 6 is rotated, depending on the flow rate range, the inside of the blower and the gap 14 become negative pressure, and some of the oil supplied to the bearing 3 and the thrust bush 2 is sucked and transferred to the blower side. flows to

However, since the oil cylinder ring 5 is provided with a disc-shaped projection 7, the oil is first blown off by the centrifugal force on the outer periphery of the projection 7, and then the remaining oil is reduced by the first sealing 8. The oil leaking through the groove gap of this seal ring travels along the surface of the oil cylinder ring towards the second seal ring 9, but a diameter difference is provided in the oil dynamic ring part between the two. Therefore, most of the oil is blown away due to the difference in centrifugal force, and only a small amount of the remaining oil moves toward the second seal ring 9, where it is removed. The oil is further blocked, and only a very small amount of oil reaches the second seal ring 9.
Therefore, the amount of oil that passes through this seal ring gap and leaks out to the back of the fan wheel becomes extremely small.

FIG. 3 shows another embodiment of the present invention, which differs from the embodiment shown in FIG. This is the point that was placed in the same position.

Even in this way, oil can be effectively prevented from being sucked into the blower.
must be divided into two parts, a large diameter part and a small diameter part, in consideration of assembly.

In the figure, the same reference numerals as those shown in FIG. 2 indicate the same parts.

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.

The oil cylinder device of the turbocharger bearing of the present invention has a disc-shaped protrusion on the thrust bush side end of the oil cylinder ring, shakes off the oil here, and arranges the seal rings apart from each other. A step with a diameter difference is provided in the oil ring between the seals, and this centrifugal force difference causes the oil transmitted through the oil ring to be shaken off, and only a small amount of oil transfers to the final seal ring. It is possible to effectively prevent oil from being sucked into the blower, it is possible to reduce blow pie, and furthermore, even if the protrusion of the oil cylinder ring is broken, parts can be easily replaced.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the oil cylinder device of the conventional turbocharger bearing, Figure 2
The figure is an explanatory diagram of one embodiment of the oil cylinder device of the supercharger bearing portion of the present invention, and FIG. 3 is an explanatory diagram of another embodiment of the oil cylinder device of the turbocharger bearing portion of the present invention. 1 is a turbine shaft, 5 is an oil cylinder ring, 6 is a blower fan wheel, 7
is a protrusion, 8 and 9 are seal rings, 10 is an air handling chamber contact plate,
11 is an air vent chamber, and 14 is a gap.

Claims (1)

[Scope of utility model registration request] A blower fan wheel is fixed to one end of the turbine shaft, and a thrust bushing is fitted to a predetermined position of the turbine shaft so as to rotate integrally with the turbine shaft, and the rear side of the blower fan wheel of the turbine shaft and the thrust bushing are connected to each other. In between, an oil cylinder ring is fitted so as to be able to rotate integrally with the turbine shaft, and the outer periphery of the oil cylinder ring is provided with a large diameter part and a small diameter part, and the thrust bushing side end of the oil cylinder ring is provided with a large diameter part and a small diameter part. A disc-shaped protrusion having a diameter larger than the outer diameter of the large diameter or small diameter portion of the oil cylinder ring is provided in the oil cylinder ring, and an air vent chamber and an air handling chamber contact plate are provided in the large diameter part and the small diameter part of the oil cylinder ring. A hydraulic device for a supercharger bearing, characterized by being equipped with a seal ring that comes into contact with.