JPH041314Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a structure applied to an oil leakage prevention mechanism provided on the compressor side of a turbocharger, and particularly relates to a wear prevention structure for a seal ring in the leakage prevention mechanism. .

[Conventional technology]

Conventionally, an oil leak prevention mechanism 7' as shown in Figs. 3 and 4 has been installed on the compressor side of a turbocharger.
The oil leakage mechanism 7' consists of a rotary member 2 attached with a nut 6 together with the compressor wheel 4 at the reduced diameter portion 5A of the rotor shaft 5 of the turbocharger, and a circle formed on the rotary member 2. The seal ring 1 is provided so that its inner circumferential portion is fitted into the circumferential groove 2C and its outer circumferential portion is able to abut against the inner circumferential surface of the circular hole 3B in the fixed portion 3 of the turbocharger.

In this oil leak prevention mechanism 7', the seal ring 1 is tightly attached and fixed to the inner circumferential surface of the circular hole 3B of the fixing part 3 by its own tension.

Then, when the turbocharger in which the rotor shaft 5 rotates at high speed operates, the pressure acting on the end surface 1a of the seal ring 1 increases due to the supercharging pressure from the compressor wheel 4 side. Move to the right in the diagram.
Along with this, the end surface 1b of the seal ring 1 and the circumferential groove 2
C comes into contact with the end surface 2a.

In this way, the seal ring 1 is disposed such that its outer circumferential portion abuts the inner circumferential surface of the circular hole 3B of the fixing portion 3, and its end surface 1b abuts the end surface 2a of the circumferential groove 2C. This prevents oil leakage.

Note that a collar portion 2b is provided at the end of the rotating member 2 for transmitting the thrust load to the enlarged diameter portion 5B of the rotor shaft 5, and the collar portion 2b is normally
It is formed larger than the diameter of the enlarged diameter portion 5B of the rotor shaft 5 and the diameter of the circular hole 3B in the fixed portion 3.

[Problem that the invention attempts to solve]

However, such an oil leak prevention mechanism 7'
During the operation of the turbocharger, pressure always acts on the end face 1a of the seal ring 1, and the end face 1b of the fixed seal ring 1 and the circumferential groove 2 of the rotating member 2
The seal ring 1 may come into contact with the end surface 2a of the seal ring 1, causing wear and tear, making it impossible to reliably prevent oil leakage.

Therefore, a stopper that can restrict the movement of the seal ring 1 in the direction away from the compressor wheel 4 is provided on the inner peripheral surface of the circular hole 3B of the fixed part 3, protruding between the seal ring 1 and the collar part 2b. However, if a stopper as described above is formed on the inner circumferential surface of the circular hole 3B, the oil leak prevention mechanism 7' cannot be assembled to the fixing part 3.

That is, when assembling the oil leak prevention mechanism 7' to the fixed part 3, since the rotating member 2 has the collar part 2b, the rotating member 2 with the seal ring 1 fitted into the circumferential groove 2C is first assembled. After installing it on the rotor shaft 5,
This rotor shaft 5 is inserted into the circular hole 3B of the fixed part 3 while moving from the right side of the fixed part 3 in the direction shown by arrow A, and the compressor wheel 4 is attached to the rotor shaft 5 from the left side of the fixed part 3 by tightening the nut 6. Installation is done. Therefore, when a stopper is provided protrudingly on the inner peripheral surface of the circular hole 3B, this stopper and the seal ring 1 interfere with each other, and the seal ring 1 is pushed into the circular hole 3B.
It will no longer be possible to insert it inside.

For this reason, in the conventional oil leakage prevention mechanism 7' on the compressor side of a turbocharger, the seal ring 1 is formed of an expensive wear-resistant material without providing a stopper as described above. Trying to suppress wear.

In view of these circumstances, the present invention is a turbocharger that reliably prevents the progress of wear of the seal ring in the oil leakage prevention mechanism provided on the compressor side of the turbocharger without using expensive wear-resistant materials. The purpose of this invention is to provide a seal ring wear prevention mechanism.

[Means for solving problems]

Therefore, the turbocharger seal ring wear prevention mechanism of the present invention is provided with an oil leakage prevention mechanism on the compressor side of the turbocharger, and the oil leakage prevention mechanism is connected to the compressor wheel and flange member at the reduced diameter portion of the rotor shaft of the turbocharger. and a rotating member with a circumferential groove interposed between the rotary member and the rotary member, the inner circumferential portion of which is fitted into the circumferential groove of the rotary member, and the outer circumferential portion of which is adapted to abut against the inner circumferential surface of the circular hole in the fixing portion of the turbocharger. and a seal ring provided in the fixing portion, and a ridge-shaped stopper is provided on the inner circumferential surface of the circular hole of the fixing portion to restrict movement of the seal ring in a direction away from the compressor wheel; The flange member and the rotating member with a circumferential groove are formed separately from each other, and the seal ring slides toward the rim-like stopper along the inner peripheral surface of the circular hole of the fixing part in an initial state. It is characterized in that it is movable until it comes into contact with the end face of the circumferential groove, and is also movable until it comes into contact with the ridge-shaped stopper as the seal ring wears.

[Effect]

According to the above-mentioned seal ring wear prevention structure of the present invention, the seal ring slides along the inner peripheral surface of the circular hole of the fixed part of the turbocharger in the initial state due to pressure from the compressor wheel side, and the compressor Although it moves in the direction away from the wheel, its movement is regulated by the protruding stopper, so that the wear of the seal ring due to contact between the end face of the seal ring and the end face of the circumferential edge is only initial wear, and no further wear occurs. does not proceed.

Furthermore, since the flange member and the circumferentially grooved rotary member are formed separately from each other, the circumferentially grooved rotary member into which the seal ring is fitted is inserted into the circular hole in the fixing portion on the side of the compressor wheel. inserted from.

〔Example〕

The structure for preventing wear of a seal ring of a turbocharger as an embodiment of the present invention will be explained below with reference to the drawings. Fig. 1 is a schematic longitudinal cross-sectional view thereof, and Fig. 2 shows a state in which the progress of wear of the seal ring has stopped. FIG.

As shown in FIG. 1, an oil leak prevention mechanism 7 is provided on the compressor side of the turbocharger. A rotating member 2B with a circumferential groove interposed therebetween, and the inner circumferential part is fitted into the circumferential groove 2C of the rotating member 2B, and the outer circumferential part is fitted into the inner circumferential surface of the circular hole 3B in the fixing part 3 of the turbocharger. A seal ring 1 is provided so that the seal ring 1 can come into contact with the seal ring 1.

In this oil leak prevention mechanism 7, the seal ring 1 is slidably attached to the inner circumferential surface of the circular hole 3B of the fixed part 3 by its own tension.

A ridge-shaped stopper 3A is formed on the inner circumferential surface of the circular hole 3B of the fixed part 3 to prevent the seal ring 1 from moving away from the compressor wheel 4. The seal ring 1 is provided so as to be able to slide along the inner peripheral surface of the circular hole 3B toward the edge-shaped stopper 3A until it comes into contact with the end surface of the circumferential groove 2C. Accordingly, it can be moved until it comes into contact with the flange-like stopper 3A.

Further, the flange member 2A and the rotating member 2B with a circumferential groove are formed separately from each other, and the flange member 2A and the rotating member 2B have the same shape as a conventional rotating member (see reference numeral 2 in FIG. 3). is beginning to form. That is, the flange member 2A is connected to the enlarged diameter portion 5B of the rotor shaft 5 and the fixed portion 3.
is formed larger than the diameter of the circular hole 3B in,
It abuts between the reduced diameter part 5A and the enlarged diameter part 5B of the rotor shaft 5, and the conventional collar part (see reference numeral 2b in FIG. 3)
fulfills the same function.

The compressor wheel 4, the circumferentially grooved rotary member 2, and the flange member 2A are tightened with a nut 6 and attached to the reduced diameter portion 5A of the rotor shaft 5.

Further, the clearance between the seal ring 1 and the stopper 3A is set to a minimum clearance such that they do not come into contact during assembly.

As an embodiment of the present invention, the seal ring wear prevention structure of the turbocharger is constructed as described above, so that when the rotor shaft 5 rotates at high speed and the turbocharger operates, the compressor wheel 4
Due to the supercharging pressure from the side, the seal ring 1 moves in the direction shown by arrow B in FIG.

As a result, the right end surface of the fixed seal ring 1 and the end surface of the rotating circumferential groove 2C come into contact, causing wear.

However, in this embodiment, the movement of the seal ring 1 in the direction of arrow B, that is, in the direction away from the compressor wheel 4, is caused by the movement of the seal ring 1 through the circular hole 4, as shown in FIG.
Since the wear of the seal ring 1 is restricted by the protruding stopper 3A formed on the inner circumferential surface of the seal ring B, the wear of the seal ring 1 is only a very slight initial wear and no further wear occurs.

That is, in the initial state, the seal ring 1 is as follows:
It moves toward the edge-shaped stopper 3A along the inner peripheral surface of the circular hole 3B in the turbocharger fixing part 3, and first comes into contact with the end face of the circumferential groove 2C, causing wear due to relative rotation, but only the initial wear is caused. After that, the seal ring 1 comes into contact with the protruding edge-shaped stopper 3A and its movement is restricted, and the wear of the seal ring 1 due to relative rotation while in contact with the edge of the circumferential groove 2C does not progress. Furthermore, the sealing function of the seal ring 1 is sufficiently maintained due to its close contact with the end surface of the circumferential groove 2C.

Therefore, wear and even abrasion of the seal ring 1 is reliably prevented without using expensive wear-resistant materials, and the reliability of the oil leak prevention mechanism 7 is greatly increased. There is no need for periodic replacement.

On the other hand, the oil leakage prevention mechanism 7 to which the turbocharger seal ring wear prevention structure of this embodiment is applied
can be easily assembled to the solid part 3 using the following procedure.

First, the reduced diameter part 5A of the rotor shaft 5, on which the flange member 2A is attached, is inserted from the right side of the fixed part 3 into the fixed part 3.
After inserting it into the circular hole 3B, from the left side of the fixing part 3,
The rotary member 2 in which the seal ring 1 is fitted into the circumferential groove 2C is attached to the fixed portion 3 along the reduced diameter portion 5A of the rotor shaft
Insert it into the circular hole 3B.

Then, the compressor wheel 4 is attached to the end of the reduced diameter portion 5A of the rotor shaft 5 and tightened with the nut 6, completing the assembly of the oil leak prevention mechanism 7 to the fixed portion 3.

As described above, in this embodiment, the conventional rotating member (see reference numeral 2 in FIG. 3) is formed as two separate bodies, the flange member 2A and the circumferentially grooved rotating member 2B. The function of the oil leak prevention mechanism 7 is not impaired, and furthermore, the oil leak prevention mechanism 7 can be assembled to the fixing part 3 very easily without interference between the seal ring 1 and the lip-shaped stopper 3A.

[Effect of idea]

As described in detail above, according to the turbocharger seal ring wear prevention structure of the present invention, an oil leakage prevention mechanism is provided on the compressor side of the turbocharger, and the oil leakage prevention mechanism is provided at the reduced diameter portion of the rotor shaft of the turbocharger. A rotating member with a circumferential groove is interposed between the compressor wheel and the flange member, and the inner circumferential part is fitted into the circumferential groove of the rotating member, and the outer circumferential part is connected to the inner circumference of the circular hole in the fixing part of the turbocharger. a seal ring provided so as to be able to come into contact with the surface, and a protrusion on the inner circumferential surface of the circular hole of the fixing part that can restrict the seal ring from moving away from the compressor wheel. The flange member and the rotating member with a circumferential groove are formed separately from each other, and the seal ring is formed in the shape of a protrusion along the inner circumferential surface of the circular hole of the fixed portion in an initial state. It has an extremely simple structure in that it is movable until it slides toward the stopper and abuts the end face of the circumferential groove, and is also movable as the seal ring wears until it abuts the ridge-shaped stopper. , without using expensive wear-resistant materials, the progression of seal ring wear is reliably prevented, greatly increasing the reliability of the oil leak prevention mechanism, and eliminating the need for seal ring maintenance and periodic replacement. It is.

In particular, in the present invention, in the initial state, the seal ring moves toward the protruding stopper side along the inner peripheral surface of the circular hole in the fixed part of the turbocharger, and comes into contact with the end surface of the circumferential groove, causing wear due to relative rotation. However, there is only initial wear, and after that, the seal ring comes into contact with the above-mentioned protruding stopper and its movement is regulated, and the sealing occurs due to relative rotation while in contact with the edge of the circumferential groove. The effect is that the friction of the ring stops progressing, and the sealing function of the seal ring is sufficiently maintained due to its close contact with the edge of the circumferential groove.

Furthermore, since the flange member and the rotating member with the circumferential groove are formed separately from each other, even if a protruding stopper is provided, it is extremely easy to assemble the oil leak prevention mechanism to the fixed part. There are also advantages.

[Brief explanation of the drawing]

Figures 1 and 2 show a seal ring wear prevention mechanism for a turbocharger as an embodiment of the present invention. Figure 1 is a schematic longitudinal sectional view of the mechanism, and Figure 2 shows the progress of wear of the seal ring. FIG. 3 is a schematic vertical sectional view showing a stopped state, and FIGS. 3 and 4 show a conventional oil leak prevention mechanism. FIG. 3 is a schematic vertical sectional view thereof, and FIG. FIG. 1... Seal ring, 2A... Flange member,
2B... Rotating member with circumferential groove, 2C... Circumferential groove,
3... Fixed part of the turbocharger, 3A... Edge-shaped stopper, 3B... Circular hole, 4... Compressor wheel, 5... Rotor shaft of the turbocharger,
5A...Reduced diameter part, 5B... Expanded diameter part, 6... Nut, 7... Oil leak prevention mechanism.

Claims (1)

[Scope of utility model registration request] An oil leak prevention mechanism is provided on the compressor side of the turbocharger, and the oil leak prevention mechanism includes a rotating member with a circumferential groove interposed between the compressor wheel and the flange member at the reduced diameter portion of the rotor shaft of the turbocharger. and a seal ring whose inner circumferential portion is fitted into the circumferential groove of the rotating member and whose outer circumferential portion is provided so as to come into contact with the inner circumferential surface of the circular hole in the fixed portion of the turbocharger; A protruding stopper is provided on the inner circumferential surface of the circular hole to prevent the seal ring from moving away from the compressor wheel, and the flange member and the circumferentially grooved rotary member are provided with a stopper that prevents the seal ring from moving away from the compressor wheel. Formed as a separate body,
In an initial state, the seal ring is movable along the inner circumferential surface of the circular hole of the fixing portion toward the edge-shaped stopper until it comes into contact with the end surface of the circumferential groove. A seal ring wear prevention structure for a turbocharger, characterized in that it is movable as it wears until it comes into contact with the ridge-shaped stopper.