JPH0640983Y2 - Bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a bearing device, and more particularly to a bearing device suitable for use as an intermediate support device in a screw conveyor or the like.

[Prior Art] An intermediate bearing is provided in a long screw conveyor or the like to prevent bending at the center of the shaft. In the intermediate bearing used in this screw conveyor, the particles conveyed by the conveyor infiltrate into the bearing portion, which causes severe wear. Therefore, in order to improve the durability of the bearing surface, hard facing or the like is applied to the shaft side or the bearing side. Also, the use of a ball bearing or the like as the intermediate bearing has been attempted.

It is also conceivable to adopt cemented carbide or ceramic such as silicon nitride, which is resistant to wear of the bearing surface.

[Problems to be Solved by the Invention] Even if the hardfacing is applied as described above, the hardness of the hardfacing metal is insufficient, and the wear of the bearing surface due to the infiltration of particles into the bearing portion is surely prevented. It is difficult to obtain a long life.

Further, the ball bearing has a problem in sealing, and also has a problem that wear due to infiltration of particles progresses and the life is short.

Therefore, it is conceivable to use cemented carbide or ceramics such as silicon nitride, which can sufficiently withstand such particles even if such particles enter the sliding surface of the bearing, as the sliding member of the bearing. Since cemented carbide and ceramics are extremely hard, delicate centering is not possible, and when the shaft side and the shaft side of the bearing side are not the same and intersect, they do not fit together and uneven wear occurs on one side. Also, if an overload is applied during operation and bending is applied to the shaft or bearing,
The above-mentioned materials have little flexibility and are hard to be deformed, so that they may be damaged and, in an extreme case, may be damaged.

[Means for Solving the Problems] In the bearing device of the present invention, a cemented carbide or ceramic chip is embedded in the bearing bush inner peripheral surface and the shaft outer peripheral surface, respectively, and at least one of the bearing bush and the shaft neck is embedded. In the bearing device in which the tip is projected, the tip on the bearing bush side and the tip on the shaft neck side slide,
The bearing bush has a cylindrical structure-enhancing member having the tip embedded in the inner peripheral surface thereof and a cylindrical deformation absorbing member integrally concentrically arranged on the outer periphery thereof.

Secondly, the material of the structure enhancing member is chromium molybdenum steel, and thirdly, the material of the deformation absorbing member is polyurethane.

[Operation] In the bearing device of the present invention, the bearing bush and the shaft neck are pivotally supported by sliding of the cemented carbide chip or the ceramic chip embedded in the inner peripheral surface and the outer peripheral surface thereof. Further, at least one of the tip of the bearing bush and the tip of the shaft is projected, and therefore, a gap exists around the projected tip.

In this way, sliding is due to the sliding of cemented carbide chips or ceramic chips with extremely high hardness,
The wear itself is extremely small, and since there is a gap in the bearing part, particles such as sand that have infiltrated into the bearing part can be quickly discharged to the outside of the bearing, and it can almost enter the sliding surface of the chips. Therefore, wear on the bearing sliding surface is extremely small.

Further, since the bearing bush of the present invention is formed by combining the cylindrical structure-enhancing member having the chip embedded therein and the cylindrical deformation absorbing member into one body, the machining accuracy is poor and the shaft and the bearing are misaligned. Even if there is some, it can be easily fitted by deformation of the deformation absorbing member, and even if the shaft is subjected to deformation such as bending or tilting due to excessive load on the shaft during operation, the deformation absorbing member of the bearing bush Absorbs the deformation, and the structure-enhancing member prevents excessive deformation and prevents the sliding member (chip) from being damaged.

[Embodiment] Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.

1 to 3 show an embodiment of the present invention, FIG. 1 is a front view of a bearing bush, and FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a side view of the shaft neck.

The bearing bush 1 is embedded in the structure-enhancing member 1b and the inner peripheral surface of the structure-enhancing member 1b at a predetermined interval, and a large number of cemented carbide chips or ceramic chips protruding from the inner peripheral surface of the structure-enhancing member 1b. It has 1a. Structural reinforcement member
1b is a one-piece or divided into a circle. The tip 1a has an appropriate shape such as a cylindrical shape or a polygonal shape, is embedded in the structure enhancing member 1b, and is fixed by means such as brazing or shrink fitting.

Although the chips 1b are arranged in two rows in this embodiment,
In FIG. 1, the rear chip row is not shown for the sake of clarity.

FIG. 3 shows a shaft neck 2 fitted to the bearing bush 1, and a cemented carbide chip or a ceramic chip 2a is embedded in the outer peripheral surface thereof. In addition, this shaft 2
In, the tip surface of the tip 2a is flush with the outer peripheral surface of the shaft.

Further, in this embodiment, the tip 2a of the shaft 2 has a hardness slightly higher than that of the tip 1a on the bush side, and is configured to prevent wear on the shaft side as much as possible.

When such a bearing bush 1 and a shaft 2 are combined, the chips 1a and 2a slide, and their hardness is extremely high, so that wear is extremely small. Further, since the tip 1a is projected, there is a gap between the outer circumferential surface of the shaft 2 and the inner circumferential surface of the bearing bush 2 by the amount of the projection of the tip 1a, and even when particles such as sand enter the bearing portion. The particles are immediately discharged to the outside of the bearing, and wear due to foreign matter being caught on the sliding surface is prevented. Further, the above-mentioned gap also has a function as a reservoir for lubricating oil. The main body of the shaft 2 is also made of, for example, steel or plastic, and the tip 2a is embedded in the main body of the shaft and fixed by brazing or shrink fitting.

In the above embodiment, the tip on the bush side is projected, and the tip end surface on the shaft neck side is flush with the shaft outer peripheral surface. The tip 2a on the shaft neck side may be projected so as to be flush with the peripheral surface and the tips 1a and 2a may be slid. FIG. 4 is a front view of a bearing bush used in such a bearing, and FIG. 5 is a sectional view taken along the line VV in FIG.

Further, in the present invention, both the bush-side and shaft-neck-side tips 1a and 2a may be projected from the bush inner peripheral surface and the shaft outer peripheral surface, and only the tips may be slid together.

Further, the bearing of the present invention is not limited to the bush side fixed and the shaft side movable, but the bush side movable.
It can also be applied to a fixed shaft side.

Further, the deformation absorbing member 1c is concentrically provided on the outer periphery of the structure enhancing member 1b of the bearing bush 1 by a concentric adhesive and the structure enhancing member 1b is formed.
It is integrally joined with. Therefore, even if the shaft center of the shaft neck 2 and the shaft center of the bearing bush 1 are slightly misaligned during assembly of the bearing due to an error in processing accuracy, the shaft and the bearing are displaced by the displacement of the deformation absorbing member 1c at the outermost periphery of the bearing bush 1. Is closely attached to.

Further, even if the shaft is inclined from the state of the normal shaft due to overload during operation, or the shaft is bent, due to the deformation of the deformation absorbing member 1c or the structural proof strength of the structure reinforcing member 1b,
The hard and brittle tip 1a located at the innermost circumference can avoid damage or damage without excessive deformation.

Further, as shown in FIG. 2, when a cylindrical or groove-shaped void 1d is provided on the outermost periphery of the deformation absorbing member 1c, the deformation is further facilitated and the safety of the chips 1a, 2a of the bearing bush 1 is improved. Further improve.

It should be noted that, in addition to the structure-enhancing member 1b, for example, in addition to ordinary iron and steel materials, in actual machines under severe operating conditions that require particularly high toughness, chromium molybdenum steel, for example, JIS standard SCM
435 and the like are suitable.

Further, the deformation absorbing member 1c is preferably made of a relatively soft synthetic resin such as a polyurethane-based resin in addition to ordinary rubber.

[Effects of the Invention] As is clear from the above description, in the present invention, the hard tip is embedded in each of the bush side and the shaft neck side, and the tip on at least one side is projected. Has very little wear. Moreover, the sliding of the bearing surface is prevented from being worn due to the inclusion of foreign matter, resulting in extremely excellent wear resistance. In addition, since a void is formed on the bearing surface, it is possible to provide a bearing having extremely excellent seizure resistance. In addition, to prevent damage and destruction of sliding members (chips) that are hard to wear but hard and brittle by absorbing the displacement of shaft deformation and shock due to foreign matter biting into the bearing part and overload. As a result, the bearing and shaft can be maintained for a long life, and maintenance is easy.

The bearing device of the present invention is suitable as, for example, an intermediate bearing of a screw conveyor, but is also applicable to various other bearing devices.

[Brief description of drawings]

1 is a front view of a bearing bush of a bearing device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG.
FIG. 4 is a side view of the coaxial neck, FIG. 4 is a front view of a bearing bush according to a different embodiment, and FIG. 5 is a sectional view taken along line VV of FIG. 1 ... Bearing bush, 1a ... Tip, 1b ... Structural enhancement member, 1c ... Deformation absorbing member, 1d ... Void, 21 ... Shaft, 2a ... Tip.

Claims (3)

[Scope of utility model registration request] 1. A bearing device having a shaft bush fitted in a bearing bush, wherein cemented carbide chips or ceramic chips are embedded in the bearing bush inner peripheral surface and the shaft outer peripheral surface, respectively. In the bearing device in which the tip is projected on at least one of the bearing bush and the shaft neck, and the tip on the bearing bush side and the tip on the shaft neck are slid, the tip is provided on the inner peripheral surface of the bearing bush. A bearing device comprising: an embedded cylindrical structure-enhancing member and a cylindrical deformation absorbing member integrally and concentrically arranged around the outer periphery of the embedded structure reinforcing member. 2. A bearing device in which the material of the structure enhancing member according to claim 1 is chrome molybdenum steel. 3. A bearing device in which the deformation absorbing member according to claim 1 is made of polyurethane.