JPS5933765B2 - damping bearing - Google Patents

Description

[Detailed description of the invention] The present invention relates to damping bearings.

In recent years, damping bearings have been increasingly used as bearings that dampen the response of a bearing portion to shaft vibration.

This damping bearing is known from US Pat. No. 3,456,992. This type of damping bearing has a structure in which a bearing supporting a rotating shaft is floatingly supported by a spring means provided on a fixed member, and a damping fluid film is formed between the outer peripheral surface of the bearing and the fixed member. As the spring means of this damping bearing, a squirrel cage spring consisting of a plurality of elastic ribs is used. However, this squirrel cage spring was prone to bending damage when subjected to excessive vibration force such as an earthquake, and torsional damage when subjected to excessive starting torque.

The present invention has been made based on the above-mentioned problems, and an object of the present invention is to provide a damping bearing that can prevent bending and torsional damage of the squirrel cage spring in the damping bearing.

The present invention is characterized in that a damping bearing in which a bearing supporting a rotating shaft is floatingly supported by a spring means provided on a fixed member, and a damping fluid film is formed between the bearing and the fixed member. Means for restraining these large relative displacements is provided between the side surface of the supported bearing and the opposing fixed member to prevent bending or twisting damage of the spring means caused by the action of external force. It is something.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the damping bearing of the present invention. In the figure, 1 is a casing, 2 is a rotating shaft, and 3 is a bearing that supports the rotating shaft 2. FIG. This bearing 3 is inserted between the outer peripheral surface 2a of the rotating shaft 2 and the inner peripheral surface 1a of the casing 1, and is movable in the radial direction. An oil supply groove 4 is provided in the inner peripheral surface 3a of the bearing 3. The oil supply groove 4 communicates with the oil supply passage □ of the casing 1 through an oil supply passage 5 provided in the bearing 3 and a fluid film portion 6 formed on the outer circumference of the bearing 3. Bearing 3
A piston ring 8 for preventing leakage of the fluid supplied to the fluid film portion 6 is provided near the end surface of the outer peripheral surface 3b. The bearing 3 is elastically supported by a spring means 9 fixed to one side surface 3c. The spring means 9 is fixed to a spacer 10 disposed within the casing 1 on one side 3c of the bearing 3. This spring means 9
has a cage-shaped structure including a plurality of ribs 9a.
Pins Ila and Ilb are provided on both side surfaces 3c and 3d of the bearing 3 to protrude parallel to the axis. The tips of these pins 11a and 11b are inserted into pin holes 12a provided in the spacer 10 and pin holes 12b provided in the stopper plate 13, respectively, with a minute gap G1 therebetween. One or more of these pins 11a, 11b are provided on both sides 3c, 3d of the bearing 3. By configuring like this,
Even if an external force acts on the cage-shaped spring means 9, the pins 11a,
11b and the pin holes 12a, 12b, the spring means 9 will not be displaced beyond the gap G1.

Therefore, damage to the cage-shaped spring means 9 can be prevented. It goes without saying that the dimensions of the gap G1 are set to such an extent that the cage-shaped spring means 9 will not be damaged, and the diameters of the pins 11a and 11b are set to such an extent that they will not be damaged in terms of strength. Further, although the spacer 10 and the stopper plate 13 are provided as independent parts, they can also be constructed integrally with the casing 1. FIG. 2 shows another embodiment of the damping bearing of the present invention, and in this figure, the same reference numerals as in FIG. 1 are the same parts. This embodiment consists of a pin 11b and a pin hole 12b into which the tip of the pin 11b engages between one side surface of the bearing 3 (one side surface 3d of the bearing 3 in this example) and a stopper plate 13. It is equipped with restraint means. With this configuration, even if an external force acts on the spring means 9, the spring means 9 is prevented from being damaged by the restraining means formed by the engagement between the pin 11b and the pin hole 12b, as in the embodiment described above. can do.

Further, according to this embodiment, there is an advantage that the axial dimension of the bearing can be reduced. In addition, in the two embodiments described above, the pins 11a and 11b were fixed to the side surfaces 3c and 3d of the bearing 3, respectively, but the pins 11a and 11b
are fixed to the spacer 10 and the stopper plate 13, pin holes are provided in the side surfaces 3c and 3d of the bearing 3, and the pin 11a is inserted into the pin hole.
, 11b can also be inserted. Further, in the above-mentioned embodiment, the piston ring 8 was used as the fluid outflow prevention means of the fluid film part 6, but the outer peripheral surface 3b of the bearing 3 forming the fluid film part 6, the side surfaces 3c and 3d of the bearing 3, and the spacer 10. It is also possible to form a diaphragm with a minute gap in the gap between the stopper plate 13 and the stopper plate 13. Furthermore, although a sliding bearing is used as the bearing 3 in the above-described embodiment, other bearings such as a rolling bearing or a tilting pad bearing may also be used. As detailed above, the present invention provides means for restraining large relative displacement between the bearing and the fixed member in the damping bearing, so that bending of the squirrel cage spring means caused by the action of external force is avoided. Alternatively, twisting damage can be reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the damping bearing of the present invention;
FIG. 2 is a longitudinal sectional view showing another embodiment of the damping bearing of the present invention. 1...Casing, 2...Rotating shaft, 3
...Bearing, 3c, 3d...Side surface of bearing 3, 6...Fluid film portion, 9...Spring means, 11a, 11b...・Pin, 12a, 12b・
...Pin hole.

Claims (1)

[Claims] 1. A damping system in which a shaft supporting a rotating shaft is floatingly supported by a plate spring means arranged between the bearing and a fixed member in parallel with the rotating axis, and a damping fluid film is formed between the bearing and the fixed member. In the bearing, a pin that restrains the relative position of the floating bearing in the radial direction and rotational direction is attached to the bearing side or a fixed member parallel to the axis of rotation, and the tip of this pin is engaged with a gap. A damping bearing characterized in that a mating pin hole is provided on a fixing member or a side surface of the bearing.