JP2530995Y2 - Ball bearing supercharger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball bearing supercharger in which a ball bearing for supporting a turbine shaft is held by an oil film damper.

[0002]

2. Description of the Related Art As an example of a ball bearing supercharger, generally,
As shown in FIG. 4, the turbine casing 1 and the blower casing 2 are integrated with a bearing casing 3 interposed therebetween, and a turbine wheel 4 in the turbine casing 1 and a blower fan 5 in the blower casing 2 Are connected by a turbine shaft 6 passed through the bearing casing 3, the turbine impeller 4 is rotated by gas flowing from a gas passage 8 of the turbine casing, so that the blower fan 5 rotates. It is known that the turbine shaft 6 is rotatably supported by ball bearings 9 and 10 on the turbine side and the blower side in the bearing casing 3.

Since the ball bearings 9 and 10 are indispensable for a damping effect, an outer ring is fixed to an oil film damper 12 arranged on the inner diameter portion 13 of the bearing casing 3 so that an oil film 11 is formed on the outer surface. The inner ring is fixed to the turbine shaft 6. Reference numeral 7 denotes a heat shield plate, 14 denotes a detent pin of the oil film damper 12, 15 denotes a seal plate, 16 denotes an oil drain, 1
Reference numeral 7 denotes a piston ring.

[0004]

However, in the case of the above-described ball bearing supercharger, the ball bearings 9, 10 for supporting the turbine shaft 6 are provided.
Is a point contact type, and its vibration and noise are transmitted to the bearing casing 3. Therefore, the ball bearing is formed by an oil film damper 12 in which an oil film 11 is formed between the bearing casing 3 and the inner diameter portion 13. 9 and 10 are held, but in the floating bearing system, two oil films are used.
While the oil film 11 is formed in only one layer in the ball bearing system, the oil film 11 is formed in a single layer.
When the oil film 11 is not formed well, there is a problem that a sufficient vibration damping effect cannot be obtained, for example, the vibration is transmitted to the outside due to direct metal contact and noise is increased.

Accordingly, the present invention is intended to suppress the transmission of vibration due to metal contact even when an oil film is not formed well, thereby preventing an increase in noise.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a ball bearing is held by an oil film damper disposed on an inner diameter portion of a bearing casing, and a turbine wheel and a blower are held by the ball bearing. In a ball bearing supercharger configured to rotatably support a turbine shaft connected to an electric fan, an oil film portion formed between an inner diameter portion of the bearing casing and an outer surface of an oil film damper faces. As described above, an annular groove is provided on the outer peripheral surface of the end portion of the oil film damper, and a vibration damping ring having a concave groove extending only in the outer peripheral portion in the axial direction is fitted and arranged in the annular groove.

[0007]

Since the vibration damping ring is arranged in the oil film portion, even when the oil film is not formed well, the metal ring is prevented by the vibration damping ring and a damping effect can be obtained. Therefore, transmission of vibration is suppressed and noise is reduced. In addition, since the vibration damping ring having the axial groove formed only in the outer peripheral portion is fitted into the annular groove, the thickness can be increased by that amount, rigidity can be secured, and oil circulation is hindered. There is no need to worry about impairing the cooling function of the turbine side by oil,
Due to the presence of the concave groove, sludge does not accumulate on the portion of the vibration damping ring, and there is no possibility that the function may be deteriorated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. As shown in FIG. 4, a turbine shaft 6 connecting a turbine impeller 4 and a blower fan 5 is connected to ball bearings 9 and 10. , And the ball bearings 9, 10 are disposed in an inner diameter portion 13 of the bearing casing 3 by an oil film damper 12.
In the ball bearing supercharger that is to be held by
The inner diameter portion 13 of the bearing casing 3 and the oil film damper 1
2 and 3, the groove 18a is made of rubber or resin, and extends only in the outer peripheral portion in the axial direction so as to be interposed in the portion of the oil film 11 formed between the outer surface and the outer surface of the oil film 11. The gear-shaped vibration damping ring 18 formed by arranging at equal intervals in the circumferential direction is
The oil film damper 12 has a configuration in which the oil film damper 12 is fitted and disposed in annular grooves 19 provided on the outer periphery of both ends. The vibration damping ring 18 may be divided into two parts and combined at the annular groove 19, or may be inserted in a state where one slit is provided and the oil film damper 12 is widened from the axial direction. You may do so.

With such a configuration, even if a situation where the oil film 11 is not formed well between the inner diameter portion 13 of the bearing casing 3 and the outer surface of the oil film damper 12 occurs, the vibration damping ring 18 A stable damping effect can be obtained without the metal being in contact with each other due to the presence. Therefore, noise is not increased by suppressing transmission of vibration to the outside.

In general, in a ball bearing supercharger, a cooling function on the turbine side is required, so that a certain amount of oil needs to flow to the turbine side through the outer surface of the oil film damper 12, but in the present invention, On the outer peripheral portion of the vibration damping ring 18 disposed on the oil film 11 portion,
Since the grooves 18a extending in the axial direction are arranged in the circumferential direction and the oil can pass through the grooves 18a, the flowability of the cooling oil is not hindered. In the above description, for example, when a normal O-ring is disposed in place of the oil film 11 in place of the vibration damping ring 18, the same damping effect as in the case where the vibration damping ring 18 is arranged can be obtained. In the turbocharger, since a lot of dirt and foreign matters are present, sludge may accumulate on the O-ring portion to cause a deterioration in function. In this regard, in the present invention, since the concave groove 18a formed on the outer periphery of the vibration damping ring 18 does not hinder the oil flow as described above, sludge does not accumulate. Further, since the vibration damping ring 18 is fitted in the outer circumferential groove 19 of the oil film damper 12, the rigidity can be ensured by increasing the thickness accordingly.

It should be noted that the present invention is not limited to the embodiment described above, and it is needless to say that various changes can be made without departing from the scope of the present invention.

[0013]

As described above, according to the ball bearing supercharger of the present invention, the oil is provided so as to face the oil film portion formed between the inner diameter of the bearing casing and the outer surface of the oil film damper. An annular groove is provided on the outer peripheral surface of the end portion of the film damper, and the oil film has a configuration in which a vibration damping ring having only a concave groove that allows oil to flow in the axial direction is fitted in the annular groove. Even if a situation such as not being formed well occurs, the contact between metals can be prevented by the vibration damping ring, and a stable damping effect can be obtained,
The transmission of vibrations to the outside can be suppressed to reduce noise, and the oil can flow through the concave groove on the outer periphery of the damping ring, thereby impeding the function of cooling the turbine side by oil. , Sludge accumulation can be prevented, and stable functions can be exhibited over a long period of time.
Further, since the vibration damping ring is fitted into the annular groove of the oil film damper, the thickness can be increased by that much, so that rigidity can be secured and stable operation can be obtained. Demonstrates excellent functions.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a ball bearing supercharger of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1 showing an arrangement state of a vibration damping ring.

FIG. 3 is a perspective view showing a shape of a vibration damping ring.

FIG. 4 is a schematic view showing an example of a ball bearing supercharger.

[Explanation of symbols]

 3 Bearing Chamber 4 Turbine Wheel 5 Blower Fan 6 Turbine Shaft 9,10 Ball Bearing 11 Oil Film 12 Oil Film Damper 13 Inner Part 18 Vibration Suppression Ring 18a Concave Groove 19 Annular Groove

Continuation of the front page (56) References JP-A-1-136636 (JP, A) JP-A-59-93515 (JP, A) JP-A 62-77322 (JP, U) JP-A 63-89426 (JP , U) Fully open 1987-108622 (JP, U) Fully open 1979-45547 (JP, U) Fully open 1987-67905 (JP, U) Fully open 1987-108621 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A ball bearing is held by an oil film damper disposed in an inner diameter portion of a bearing casing, and the ball bearing rotatably supports a turbine shaft connecting a turbine impeller and a blower fan. In the ball bearing supercharger, an annular groove is provided on an outer peripheral surface of an end portion of the oil film damper so as to face an oil film portion formed between an inner diameter portion of the bearing casing and an outer surface of the oil film damper. A ball bearing supercharger, wherein a vibration damping ring having a concave groove extending in the axial direction only in an outer peripheral portion is fitted into the annular groove.