JP2002048135A - Bearing structure - Google Patents

Abstract

(57) Abstract: A semi-float bearing for supporting rotation of a rotating shaft can be easily assembled into a bearing structure, and can be easily disassembled. The bearing structure has a semi-cylindrical semi-float bearing (31) for supporting rotation of a rotating shaft, which is arranged in a bearing fitting wheel (8). A pin 45 having an outer diameter enough to fit in the recess 41 and capable of being fixed to the bearing fitting wheel 8.
By moving the semi-float bearing 31 in the axial direction, the concave portion 41 of the semi-float bearing 31 is fitted to the tip of the pin 45 so as to be freely detachable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing structure having a semi-float bearing for supporting rotation of a rotating shaft, and more particularly to a bearing structure capable of stopping the semi-float bearing from rotating together with the rotating shaft. Things.

[0002]

2. Description of the Related Art In a conventional turbocharger, a turbine housing 1 and a compressor housing 2 are integrally connected via a bearing housing 3 as shown in a side sectional view of FIG. This turbocharger
A turbine wheel 4 in a turbine housing 1 and a compressor wheel 5 in a compressor housing 2 are connected by a turbine shaft 6 rotatably supported by journal bearings in a bearing housing 3. The bearing structure of this turbocharger is configured such that the turbine wheel 4 is rotated by the exhaust gas of the engine so that the compressor wheel 5
Is rotated to compress the intake air and supply it to the engine.

[0003] The turbine shaft 6 of the turbocharger is
In order to rotate at high speed, it is necessary to lubricate the journal bearing 3a, and a bearing fitting wheel 8 having an oil supply passage 7 in the circumferential direction and the radial direction is incorporated in the turbine shaft penetration portion of the bearing housing 3, and this bearing fitting ring 8 Floating metals 9 and 1 having oil supply holes 11 in the radial direction at both axial ends
0 is rotatably fitted as a journal bearing 3a, and lubricating oil O supplied through an oil supply passage 12 provided in the bearing housing 3 is guided to the inner and outer peripheral surfaces of the floating metals 9, 10.

An oil drain 15 having an uneven surface is provided on the outside of the turbine shaft 6 on which the compressor wheel 5 is mounted in the compressor housing 2.
6, a seal plate 17 whose inner peripheral surface is in contact with the compressor-side sealing 16 is attached to the bearing housing 3 to form an oil seal portion. Further, a thrust bearing 18 provided with a dedicated oil supply passage 19 communicating with the oil supply passage 13 of the bearing housing 3 is disposed between the oil drain 15 and a surface of the thrust bush 14 on the compressor side. Is a positive thrust (thrust in a direction in which the turbine shaft 6 moves toward the compressor) bearing surface, and a surface of the oil drain 15 on the turbine side is an anti-thrust (a direction in which the turbine shaft 6 moves toward the turbine). Of the thrust bearing 18.
Is lubricated by the lubricating oil O coming out of the dedicated oil supply passage 19 of the first embodiment. The lubricating oil O is supplied to the oil drain hole 20 of the bearing housing 3 and the oil drain 21 on the compressor side.
The oil is discharged from the oil discharge port 22 via

[0005] In this turbocharger bearing structure, in order to increase the load capacity of the thrust bearing 18 as the supercharging pressure increases, the lubricating oil flowing to the non-load side depends on the amount of lubricating oil required on the load side. A large amount of lubricating oil O was supplied in consideration of the amount. Therefore, a turbocharger bearing incorporating a semi-float bearing capable of reducing the amount of lubricating oil O and reducing the resistance in rotation of the turbine shaft 6 to improve the response. A structure has been proposed.

[0006] In this semi-float bearing type bearing structure, a semi-float bearing for supporting the turbine shaft is incorporated into a turbine housing and a compressor side of a bearing housing through a turbine shaft. Furthermore, with these semi-float bearings alone,
Low vibration occurs in the through-hole of the turbine shaft of the bearing housing, and it is necessary to suppress this vibration. The rotation of these semi-float bearings was prevented by a pin structure.

Therefore, as a structure for preventing the semi-float bearing from rotating with a pin structure, as shown in FIG. 6, a semi-float bearing 31 is formed in an axial hole 33 formed in the axial direction from both ends of a cylindrical connecting pipe 32. A device that prevents rotation with an inserted pin 34 has been proposed.

FIGS. 7 (a) and 7 (b) show a structure for preventing other semi-float bearings from rotating with a pin structure.
As shown in (1), there has been proposed a type in which a pin 35 extending from the periphery of the bearing fitting wheel 8 toward the center of the rotating shaft is inserted into a shaft hole 36 radially opened around the semi-float bearing 31 to prevent rotation.

Further, as a structure for preventing the semi-float bearing from rotating with a snap ring, as shown in FIG. 8, the semi-float bearing is provided with a snap ring 38 provided on a part of a snap ring 37 around the semi-float bearing 31. One that stops the bearing 31 has been proposed.

[0010]

In the above-mentioned conventional structure in which the semi-float bearing 31 is prevented from rotating by a pin structure,
Semi-floating bearing 31 to bearing housing 3
The semi-float bearing 31 could not be assembled unless it was previously inserted into the turbine shaft penetration. Therefore, this semi-float bearing 3
1 has a problem that the assembly is very complicated.

Further, when disassembling the semi-float bearing 31, it is said that the semi-float bearing 31 cannot be removed from the through-hole of the bearing housing 3 unless the pin 34 used for fixing is removed. Had a problem.

Further, in the structure in which the pin 35 is inserted into the shaft hole 36 radially opened around the semi-float bearing 31 and is prevented from rotating, the pin 35 and the shaft hole 36 may obstruct the oil supply passage 11. There was a problem that this oil supply passage 11 had to be formed in a complicated manner.

The present invention has been made to solve such a problem. That is, an object of the present invention is to provide a bearing structure that can easily assemble a semi-float bearing that supports rotation of a rotating shaft into a bearing structure, and can also easily disassemble the bearing.

[0014]

According to the present invention, there is provided a bearing structure in which a semi-cylindrical semi-float bearing (31) for supporting rotation of a rotating shaft is disposed in a bearing fitting wheel (8). A recess (41) formed in the circumferential direction of the semi-float bearing (31) in the axial direction, and a pin having an outer diameter enough to fit in the recess (41) and capable of being fixed to the bearing fitting wheel (8). (45), and by moving the semi-float bearing (31) in the axial direction, the concave portion (41) of the semi-float bearing (31) can be detachably fitted to the tip of the pin (45). A bearing structure is provided that is configured to fit.

The recess (41) is a notch formed in a substantially semicircular shape, or a step formed in a substantially semicircular shape.

In the configuration of the present invention, the semi-float bearing (31) is prevented from rotating by fitting the pin (45) into the recess (41) of the semi-float bearing (31). In the present invention, the semi-float bearing (31) can be easily disassembled and assembled only by moving the semi-float bearing (31) in the direction of the rotation axis without disassembling the bearing housing that rotationally supports the rotation shaft and removing the detent pin. . Therefore, the semi-float bearing (31) can be easily replaced in the field as compared with the conventional bearing structure.

Since a part other than the damper part of the semi-float bearing (31) is cut out and inserted, a predetermined damping can be obtained at the stage of designing the bearing structure. Since the detent pin (41) is used as a stopper in the axial direction, the number of snap rings (37) can be reduced from two to one.

Further, the bearing structure of the present invention provides a semi-cylindrical semi-float bearing (3) for supporting rotation of a rotating shaft.
1) a bearing structure in which a bearing ring (8) is disposed;
A detent claw (46) protruding in the axial direction of the periphery of the semi-float bearing (31) and the detent claw (46) provided on the bearing fitting ring (8) are fitted from the axial direction. And an engagement hole (47) that is removably fitted.

It is preferable that the claw (46) for preventing rotation of the semi-float bearing (31) protrudes in a direction in which the two semi-float bearings (31) face each other.

Alternatively, a semi-float bearing (31)
A detent engaging hole formed in the axial direction of the peripheral edge, and a claw provided on the bearing fitting ring (8), the detent engaging with the detent engaging hole so as to be removably fitted in the axial direction. It may be provided.

Regardless of the thickness of the semi-float bearing (31), the pin (4) having the detent structure of the present invention is not affected.
5) Or a nail (46) can be formed.

Further, the oil supply passage provided at the outer peripheral portion of the semi-float bearing (31) is sufficient at one place, and the oil supply passage can be simply configured. In particular, the same structure as the bearing housing (3) of the conventional model is used. To maintain compatibility.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In the drawings, common members are denoted by the same reference numerals, and redundant description is omitted. Figure 1
1 is a side sectional view showing an embodiment of the first invention of the bearing structure of the present invention. FIG. 2 shows a semi-float bearing according to the first embodiment of the bearing structure of the present invention, and is a side sectional view (a) and a front view (b). The bearing structure of the present invention is incorporated in the turbocharger shown in FIG. 5, and this turbocharger integrally connects a turbine housing 1 and a compressor housing 2 via a bearing housing 3.
The turbine wheel 4 in the turbine housing 1 and the compressor wheel 5 in the compressor housing 2
The bearing housing 3 is connected by a turbine shaft 6 rotatably supported by a journal bearing 3a in the bearing housing 3.

The semi-float bearing 31 fitted as a journal bearing 3a in the turbine shaft penetrating portion of the bearing housing 3 of the present invention has a concave portion 41 on its circumferential edge.
Are formed in the axial direction. The concave portion 41 of the semi-float bearing 31 is formed toward the inside of the two semi-float bearings 31 arranged.

The recess 4 of the semi-float bearing 31
A pin 45 having an outer diameter enough to fit into the bearing fitting 8
Is inserted through a through-hole 44 provided in the hole. The recess 41 is formed by forming a semi-circular cutout in the semi-float bearing 31. Instead of such a notch, even a step (not shown) formed so as to fit the tip of the pin 45 into a substantially semicircular shape has the function of preventing the semi-float bearing 31 from rotating.

As described above, the bearing fitting ring 8 is provided in the recess 41 of the semi-float bearing 31 which rotates together with the turbine shaft 6.
The rotation of the semi-float bearing 31 can be prevented by fitting a single pin 45 fixed to the semi-float bearing.
Therefore, the semi-float bearing 31 can be easily disassembled and assembled by moving the semi-float bearing 31 from the turbine shaft 6 in the axial direction without disassembling the bearing housing 3 and removing the detent pin 45. .

FIG. 3 is a side sectional view showing a bearing structure according to a second embodiment of the present invention. FIG. 4 shows a semi-float bearing according to a second embodiment of the bearing structure of the present invention, and is a side sectional view (a) and a front view (b). In the second embodiment of the present invention, the semi-float bearing 31 is provided with a detent claw 46 projecting in the axial direction of the peripheral edge thereof, and an engagement hole 47 fitted with the detent claw 46.
Is provided on a part of the bearing fitting wheel 8.

The semi-float bearing 31 is provided with a detent 46 for preventing rotation of the semi-float bearing 31.
Are preferably provided so as to face each other. Therefore, these claws 46 are fitted in the engagement holes 47 of the bearing fitting wheel 8 with a slight gap provided in both the rotation direction and the axial direction.

The detent claw 46 need not always be provided on the semi-float bearing 31 side. Conversely, it can be provided on the bearing fitting wheel 8 side (not shown). When a detent for preventing rotation is provided on the bearing fitting ring 8 side,
The engagement hole with which this claw is engaged is a semi-float bearing 31
It must be formed in the peripheral axis direction.

Also in the embodiment of the second invention, the pawl 46 of the semi-float bearing 31 rotating together with the turbine shaft 6
Is fitted into the engagement hole 47 of the bearing fitting wheel 8, whereby rotation of the semi-float bearing 31 can be prevented.
Moreover, since the fitting direction of the pawl 46 and the engaging hole 47 is the same as the axial direction of the turbine shaft 6, the semi-float bearing 31 can be easily disassembled and assembled from the axial direction.

It should be noted that the present invention is not limited only to the above-described embodiment. In order to prevent the rotation of the semi-float bearing 31 rotating together with the turbine shaft 6, the concave portion 41 and the claw 46 are formed on the semi-float bearing 31. Although the embodiment provided is described, the fitting direction of the members for preventing the rotation of the semi-float bearing 31 is the same as the axial direction of the turbine shaft 6, and the assembly of the semi-float bearing 31 is easily performed. The present invention is not limited to the concave portion 41 and the claw 46 as long as it can perform the disassembly, and it is also possible to dispose the one in which the concave and convex surfaces are engaged with each other. Of course, various changes can be made within a range not to be performed.

Further, the embodiment in which the bearing structure of the present invention rotatably supports the turbine shaft 6 of the turbocharger bearing structure has been described. However, if the rotating shaft is supported by the semi-float bearing 31, the turbo structure is not necessarily used. It is needless to say that the present invention is not limited to the bearing structure of the charger, and can be applied to various bearing structures without departing from the gist of the present invention.

[0033]

As described above, the bearing structure of the present invention has the following features.
The pin is fitted into the concave part of the semi-float bearing to prevent the semi-float bearing from rotating.Therefore, the bearing housing is disassembled as before, and it can be easily disassembled and assembled from the axial direction without removing the detent pin. it can. Therefore, compared with the conventional bearing structure, the semi-float bearing can be easily and easily replaced in the field.

The anti-rotation structure of the present invention can be formed irrespective of the thickness of the semi-float bearing.

Since a part other than the damper part of the semi-float bearing is cut out and inserted, a predetermined damping can be obtained at the stage of designing the bearing structure. Since the detent pin is used as a stopper in the axial direction, the number of snap rings can be reduced from two to one.

Further, the oil supply passage provided on the outer peripheral portion of the semi-float bearing is sufficient at one place, and the oil supply passage can be simply configured. There are excellent effects such as being able to keep.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of a first invention of a bearing structure of the present invention.

FIG. 2 is a side sectional view (a) showing a bearing portion in the embodiment of the first invention of the bearing structure of the present invention.
(B).

FIG. 3 is a side sectional view showing an embodiment of the second invention of the bearing structure of the present invention.

FIG. 4 is a side sectional view showing a bearing portion of the bearing structure according to the second embodiment of the present invention;
(B).

FIG. 5 is a side sectional view showing a conventional turbocharger.

FIG. 6 is an enlarged cross-sectional view showing a structure for preventing a conventional semi-float bearing from rotating using an axial pin.

FIG. 7 is an enlarged longitudinal sectional view showing a structure of a conventional semi-float bearing for preventing rotation using a radial pin (a).
(B).

FIG. 8 is an enlarged cross-sectional view showing a structure for preventing a conventional semi-float bearing from rotating using a snap ring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Turbine housing 2 Compressor housing 3 Bearing housing 3a Journal bearing 8 Bearing fitting ring 31 Semi-float bearing 41 Depression (semi-float bearing side) 45 Pin 44 Through-hole 46 Claw 47 Engagement hole

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yutaka Hirata 3-16-16 Toyosu, Koto-ku, Tokyo Ishikawajima-Harima Heavy Industries, Ltd. Tokyo Engineering Center F-term (reference) 3G005 EA04 EA16 FA41 GB56 3J011 AA01 BA02

Claims (6)

[Claims] 1. A bearing structure in which a semi-cylindrical semi-float bearing (31) for supporting rotation of a rotating shaft is arranged in a bearing fitting ring (8), wherein a semi-float bearing (31) is provided on a circumferential edge of the semi-float bearing (31). A concave portion (41) formed in the axial direction; and a pin (45) having an outer diameter enough to fit into the concave portion (41) and capable of being fixed to the bearing fitting ring (8). By moving the float bearing (31) in the axial direction, the concave portion (41) of the semi-float bearing (31) is configured to be removably fitted to the tip of the pin (45). Characteristic bearing structure. 2. The bearing structure according to claim 1, wherein the recess is a notch formed in a substantially semicircular shape. 3. The bearing structure according to claim 1, wherein said concave portion is a step formed in a substantially semicircular shape. 4. A bearing structure in which a semi-cylindrical semi-float bearing (31) for supporting rotation of a rotating shaft is disposed in a bearing fitting ring (8), wherein the semi-float bearing (31) has an axial direction around its periphery. A detent claw (46) protruding from the bearing fitting ring (8); and a detent claw (4) provided on the bearing fitting ring (8).
6) is an engagement hole (47) that is fitted so as to be able to be fitted and removed from the axial direction
And a bearing structure comprising: 5. The bearing structure according to claim 4, wherein said claw (46) for preventing rotation of said semi-float bearing (31) is protruded in a direction in which both said semi-float bearings (31) face each other. . 6. A bearing structure in which a semi-cylindrical semi-float bearing (31) for supporting rotation of a rotating shaft is arranged in a bearing fitting wheel (8), wherein a peripheral direction of a peripheral edge of the semi-float bearing (31) is provided. And a claw provided on the bearing fitting ring (8), the claw being adapted to be fitted into and disengageable from the axial direction with the engaging hole for detent. A bearing structure characterized by the following.