JPH0311458Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a sliding bearing.

[Prior Art] There are various types of conventional sliding bearings.The first one, as shown in FIG. A similarly cylindrical bushing 3 is arranged so that the outer cylinder 2 and the bushing 3 are integrated by press fitting, shrink fitting, adhesion, etc., and the main shaft 4 is passed through the inside of the bushing 3, and the bush 3 and the main shaft 4 are connected. were in sliding contact. Second, as shown in Fig. 5, an outer cylinder 2 with a curved outer periphery is disposed inside the housing 1, and a cylindrical bush 3 is attached to the inside of the outer cylinder 2 by press fitting, shrink fitting, adhesive, etc. The cylinder 2 and the bush 3 are arranged so as to be integrated, and the main shaft 4 is passed through the inside of the bush 3, so that the bush 3 and the main shaft 4 are in sliding contact, and furthermore, the outer cylinder 2 is prevented from turning around or coming off. In order to do this, a rotation preventing member 5 was attached to the housing 1.

[Problems to be solved by the invention] The above-mentioned first sliding bearing has the problem that the outer cylinder 2 is cylindrical and there is no curved part on the outer periphery, so the inclination and bending of the main shaft 4 cannot be absorbed. had. Furthermore, since the second sliding bearing is not equipped with a vibration damping mechanism that absorbs the vibration of the main shaft 4, it cannot absorb the vibration of the main shaft 4, and it is difficult to process the curved surface of the outer circumference of the outer cylinder 2. Moreover, there is a problem in that the entire bearing tends to become larger.

[Means for Solving the Problems] The present invention solves the problems of the conventional products as described above, and includes recesses on the inside of the housing at least on both ends of the outer circumferential surface, and recesses on the inner circumferential surface. A cushion material having an inclined portion whose wall thickness increases from the center toward both ends is provided, and the outer circumferential surface of the cushion material fits only into the inner circumferential surface of the cushion material. In addition, an outer cylinder integrated with a cushion material is provided, a bush is provided inside the outer cylinder so as to be integrated with the outer cylinder, a main shaft is passed through the inside of the bush, and the bush and the main shaft are connected. This is a sliding contact.

[Operation] Therefore, when the main axis is tilted or bent, the cushion material deforms accordingly. Furthermore, when the main shaft swings, the cushion material deforms accordingly.

The outer circumferential surface of the outer cylinder is fitted only to the inner circumferential surface of the cushion material, and the cushion material has an inclined portion that increases in thickness from the center toward both ends. It is susceptible to the force caused by tilting or swinging. Furthermore, since the outer circumferential surface has recesses at least on both end sides, it is easily deformed by the force received from the main shaft.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a first embodiment of the present invention, in which a cushion material 6 made of an elastic material such as rubber is disposed inside a housing 1. As shown in FIG. Cushion material 6
A plurality of ring-shaped grooves 6a are formed on both end sides of the outer peripheral surface. Further, the inner circumferential surface of the cushion material 6 is recessed into a trapezoidal shape by providing sloped portions that increase the thickness of the cushion material toward both ends. An outer cylinder 2 having a convex portion on the outside that is shaped to fit with the inner circumferential surface of the cushion material 6 is disposed inside the cushion material 6, and the cushion material 6 and the outer cylinder 2 are connected by rubber vulcanization or bonding, etc. It is integrated by A cylindrical bush 3 is disposed inside the outer cylinder 2, and the outer cylinder 2 and the bush 3 are integrated by pressure, shrink fit, adhesive, or the like. Butsuyu 3
A main shaft 4 is passed through the inside of the bushing 3, and the bush 3 and the main shaft 4 are in sliding contact.

Therefore, if the main shaft 4 is tilted or bent, the cushion material 6 will also deform accordingly. Further, when the main shaft 4 swings, the cushion material 6 deforms in accordance with the swing.

FIG. 2 shows a second embodiment of the invention,
A plurality of grooves 6b are provided on the outer peripheral surface of the cushion material 6 in the same direction as the axial direction of the main shaft 4. In FIG. 2, parts with the same reference numerals as those in FIG. 1 are the same or equivalent parts, and their explanations will be omitted.

Note that the present invention is not limited to the above-mentioned embodiments, and the cushion material 6 may have a plurality of holes provided on its outer circumferential surface.

Next, FIG. 3 shows an example of a modification of the present invention.
In the slide bearing shown in FIG. 3, the cushion material 6 is divided into a large number of disc-shaped cushion material pieces, and these cushion material pieces are arranged at regular intervals in the axial direction. In the cushion material 6 shown in FIG. 3, the intervals between the cushion materials form recesses on the outer peripheral surface. Also,
The inner circumferential surface of the cushion material 6, which is made up of a large number of cushion material pieces, is formed into a trapezoidal shape having an inclined part concave in the center, similar to the other sliding bearings described above. In FIG. 3, parts with the same reference numerals as those in FIG. 1 are the same or equivalent parts, and their explanations will be omitted.

[Effects of the invention] According to the invention, when the main shaft is tilted or bent, the cushion material can deform accordingly, which eliminates uneven contact of the main shaft and significantly reduces the local temperature rise of the bearing. can be relaxed.

In addition, vibration damping is achieved by deforming the cushion material.

Moreover, since the cushion material itself has a shape that is easily deformed due to the inclination or vibration of the main shaft, and the deformation is not prevented by the outer cylinder, the above-mentioned effects can be extremely produced. Furthermore, in the present invention, since the outer circumference of the outer cylinder does not have a curved surface,
It has the advantage of being easy to process and making it easy to downsize the entire bearing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the present invention;
Fig. 2 is a sectional view showing a second embodiment of the invention, Fig. 3 is a sectional view showing a modification of the invention, Fig. 4 is a sectional view showing one of the conventional sliding bearings, and Fig. 5. FIG. 2 is a sectional view showing another conventional sliding bearing. 1...housing, 2...outer cylinder, 3...button, 4
...Main shaft, 6...Cushion material, 6a...Groove.

Claims (1)

[Scope of utility model registration request] A cushion material is disposed inside the housing, and has a concave portion on at least both ends of the outer circumferential surface, and an inclined portion that increases in thickness from the center toward both ends on the inner circumferential surface, An outer cylinder whose outer peripheral surface fits only the inner peripheral surface of the cushion material and is integrated with the cushion material is disposed inside the cushion material, and a bush is integrated with the outer cylinder inside the outer cylinder. What is claimed is: 1. A sliding bearing characterized in that the bushing is disposed in such a manner that the main shaft passes through the inside of the bushing, and the bushing and the main shaft are brought into sliding contact.