JPH0522650Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sliding bearing in which a hard material such as ceramics is used as a sliding member, which is used as an underwater bearing of a pump.

[Conventional technology]

Conventionally, sliding bearings used as submersible bearings for pumps have been made of rubber as a sliding member disposed at a sliding portion with a rotating body. However, such sliding bearings with rubber sliding members require a supply of lubricating water, which poses a problem in that equipment and operations become complicated. For this reason,
Recently, sliding bearings that do not require the supply of lubricating water have begun to be used by using heat-resistant and highly wear-resistant materials such as ceramics for sliding members, but these ceramics are made of hard materials with low elasticity. Moreover, since there is a gap between the sleeve fitted externally on the shaft and the bearing, when the shaft is tilted due to installation error or load, the sleeve fitted externally on the shaft and the bearing may come into contact with each other locally at the end. It can be worn out and damaged.

For this reason, conventionally, for example, as shown in Figure 3,
A cylindrical elastic member 53 made of rubber is adhered to the entire contact surface of the cylindrical shell 52 that fixes the sliding member 51, and the outer periphery of the elastic member 53 is made up of a bearing stand 54 and a bearing cover 55. It was intended to be adhered to a supporting member. Note that A is the shaft of the pump, and B is a sleeve externally fitted and fixed to the shaft A.

[Problem that the invention attempts to solve]

However, as shown in Fig. 3 above, the entire inner peripheral surface of the conventional elastic member is bonded to the shell, and the outer peripheral surface is bonded to a support member such as a bearing stand, so when the shaft is tilted, it cannot deform sufficiently in response to the tilt. In other words, the elastic member is subjected to radial pressure and thrust pressure due to the tilt of the shaft, but it is barely able to respond to thrust pressure due to the restraining force caused by the entire inner and outer peripheral surfaces of the elastic member being bonded.
Moreover, since the force acting on the elastic member is generally greater in the thrust direction, the elastic member in the conventional sliding bearing is not actually able to deform in response to the inclination of the shaft. Therefore, in the conventional sliding bearing, it is not possible to eliminate localized contact (one-sided contact) between the rotating body and the bearing.

The present invention was developed in view of the above circumstances, and its purpose is to provide a sliding bearing that can reliably prevent local contact (uneven contact) between the shaft and the bearing. .

[Means for solving problems]

In order to achieve the above object, the present invention fixes a sliding member made of a hard material disposed on the sliding part with the shaft inside a cylindrical shell, and an axially intermediate part on the outside of this shell. An engaging protrusion is provided in the circumferential direction, and a cylindrical rubber elastic member is fitted on both sides of the engaging protrusion in the axial direction so as to be able to slide freely on the outer peripheral surface of the shell. Only each axial end portion is supported by a support member.

[Operation] According to the present invention, when the shaft is tilted, the engaging protrusion provided on the outside of the shell acts as a pressure transmitting part and presses the rubber elastic member in the thrust direction (axial direction). At this time, since the rubber elastic member can slide on the outer circumferential surface of the shell, the rubber elastic member is easily compressed and deformed between the engagement protrusion and the support member, that is, in the thrust direction (axial direction). can. In this way, the rubber elastic member is inserted in the thrust direction (axial direction).
Since it can be easily compressed and deformed, the sliding member and the shell can easily follow the tilt of the shaft, and the tilted shaft can be borne by the entire sliding surface of the sliding member.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 is a longitudinal sectional view showing an embodiment of the sliding bearing according to the present invention. In the figure, reference numeral 1 denotes a cylindrical sliding member made of a hard material such as ceramics, the inner circumferential surface of which slides on the outer circumferential surface of a sleeve B fitted around the shaft A of the pump. This sliding member 1 is fixed to a metal cylindrical shell 2 that is fitted around the outer periphery, and an engaging protrusion 2a is provided around the axial center of the shell 2 in the form of a band. This engaging protrusion 2
On both sides in the axial direction of a (upper and lower sides in the drawing) are elastic members 3 and 4 made of rubber, one end of which is in contact with the engaging protrusion 2a and the inner peripheral surface of which is in slidable contact with the outer peripheral surface of the shell 2. are respectively disposed, and the ends 3a of the elastic members 3 protrude from the upper end of the shell 2, and the ends 4a of the elastic members 4 protrude from the lower end of the shell 2, respectively. Furthermore, the outer peripheral surfaces of these elastic members 3 and 4 are excavated except for the vicinity of the ends 3a and 4a, and the excavated parts are made thin, and the thick parts near the unexcavated ends 3a and 4a are The outer peripheral surface is in contact with a bearing stand 5 serving as a support member. moreover,
The end surface of the end portion 3a of the elastic member 3 is in contact with the inner periphery of the bearing cover 6 as a support member, while the end surface of the end portion 3b of the elastic member 4 is in contact with the stepped portion 5 formed on the bearing stand 5.
a, and therefore the elastic members 3, 4
is supported between the bearing stand 5 and the bearing cover 6 as supporting members only at these contact surfaces.
The stepped portion 5a of the bearing stand 5 and the bearing cover 6 further protrude toward the axis A side from the abutting surfaces with the end portions 3a and 4a, and protrude above or below the shell 2. Gaps a and a' are formed between them.

In the slide bearing configured as described above, when the shaft A tilts to the left, as shown by the dashed line in FIG. One end of the elastic member 3 that comes into contact with the portion 2a is pressed, so that the elastic member 3 is compressed and easily deforms in the thrust direction. At this time, the elastic members 3 and 4 are made thinner by excavating a part of their outer peripheral surfaces, so that gaps b and b' are created between the elastic members 3 and 4 and the bearing pedestal 5, making them easier to deform. Therefore,
The shell 2 immediately follows the inclination of the axis A, and the sliding member 1 fixed to the shell 2 simultaneously inclines in accordance with the inclination of the axis A.

Note that when the engaging protrusion 2a is applying pressure to the elastic member 3 as shown in FIG. Needless to say, the elastic member 2a is compressed by applying pressure to the elastic member 4. By inclining the sliding member 1 in accordance with the inclination of the axis A in this manner, the sliding member 1 is prevented from making partial contact with the sleeve B.

In the above embodiment, the engaging protrusion 2a is provided on the shell 2, and the engaging protrusion 2a is used as a pressure transmitting part to deform the elastic members 3 and 4. It goes without saying that the example is not limited to this example, and various embodiments can be considered without departing from the scope of the claims. For example, by forming a plurality of small holes or grooves in the elastic members 3 and 4, the elasticity of the elastic member can be You can also easily adjust the degree.

[Effect of idea]

As is clear from the above explanation, according to the sliding bearing according to the present invention, even if the shaft is tilted due to installation error or load, the sliding member reliably follows the tilt of the shaft, and the sliding member and shaft are Local contact can be reliably prevented. Therefore, damage to the bearing due to such local contact does not occur, and this has a great effect on extending the life of the bearing.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the sliding bearing according to the present invention, FIG. 2 is an explanatory view illustrating the operation when the shaft is tilted, and FIG. 3 is a longitudinal sectional view of a conventional example. 1...Sliding member, 2, 2'...Ciel, 2a...
...Engaging protrusion, 3, 4... Elastic member, 5... Bearing stand (supporting member), 6... Bearing cover (supporting member).

Claims (1)

[Scope of utility model registration request] A sliding member 1 made of a hard material disposed on the sliding portion of the shaft A is fixed inside a cylindrical shell 2, and an engaging protrusion 2a is provided at the center in the axial direction on the outside of the shell 2 in the circumferential direction. Cylindrical rubber elastic members 3, 4 are fitted on both sides of the engaging protrusion 2a in the axial direction so as to be slidable on the outer peripheral surface of the shell 2. A sliding bearing characterized in that only each axial end portion 3a, 4a of a slide bearing 4 is supported by support members 5, 6.