JP2003262234A - Roller bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing device which can prevent generation of grease leakage even if it is used under the environment of being exposed to a liquid such as a cleaning liquid by employing an inexpensive constitution in which simple parts are added to a standard roller bearing. <P>SOLUTION: A pair of slingers 200 are fitted and fixed to a rotary shaft S to which a sealed type roller bearing 100 is fitted and fixed so as to sandwich the roller bearing 100. Rigidity is imparted by making the thickness of a base body part 8 functioning as a fitting and fixing part to the shaft S of each slinger 200 similar to an inner ring 1 of the roller bearing 100. An outer peripheral part of the slinger 200 is made to reach the vicinity of the outer periphery of the outer ring 1 of the roller bearing of the slinger 200. A flat face 91 opposing to an end face of the outer ring 2 via a prescribed clearance Δ is formed on a inside face in the vicinity of the outer peripheral part and is made to be a labyrinth seal part. An external liquid is efficiently sprung out by forming a projected face 93 approximately continuous to a chamfered part 23 on an outer periphery of an end part of the outer ring 2 of the roller bearing 100 on an outside face. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing device, and more particularly to a rolling bearing device suitable for use in a portion exposed to a liquid such as water or cleaning liquid.

[0002]

2. Description of the Related Art Generally, in a rolling bearing, a plurality of rolling elements, which are rollable on both the inner ring and the outer ring, are arranged in a state of being held by a cage. Among such rolling bearings, the one called a sealed type or a sealed type has a plurality of bearings between the inner ring 1 and the outer ring 2 as shown in the axially parallel sectional view of the ball bearing in FIG. The rolling elements (balls) 3 are arranged in a state of being held by a cage 4, and sealing seals 5 are attached to both axial ends of the bearing. Such a sealed type rolling bearing is used in a state where grease is sealed inside the bearing, that is, in the annular space between the inner ring 1 and the outer ring 2.

The hermetic seal 5 is formed by integrally molding an elastic material 52 such as rubber on a cored bar 51. The example shown in FIG. 2 shows a ball bearing used for inner ring rotation, and the hermetic seal 5 is fixed. The outer peripheral portion is mounted and fixed to the seal groove 21 formed on the inner peripheral surface of the outer ring 2 which is a ring, and the lip 52a formed on the inner peripheral portion is configured to be in sliding contact with the shoulder portion 11 of the inner ring 1. There is.

Further, among the above-mentioned sealed type rolling bearings, a rolling bearing called a double seal type is known as a rolling bearing having a further improved sealing performance. In this double seal type rolling bearing, two grooves for fixing a seal are formed on both sides of the inner ring or the outer ring in the axial direction, or one seal groove is formed on each end of the inner ring and the outer ring. Hermetic seal 5 as shown in
The bearings are double mounted on both sides of the bearing.

[0005]

By the way, a bottle beverage production line such as beer or juice is usually provided with a bottle washing step. In the washing step, sodium hypochlorite, Oxonia or the like is used. Acidic solution of is used to sterilize bottles. Many rolling bearings are used in a machine used in such a bottle washing process. If grease leaks from the rolling bearings to the outside, it adheres to the product bottle and remarkably impairs its commercial characteristics.

[0006] Therefore, conventionally, in such an environment, measures such as using a ceramic rolling bearing without lubrication or using the double seal type rolling bearing described above have been taken.

However, if the bearing is used without lubrication,
Even if an expensive ceramic rolling bearing is used, since it does not have a lubricating function itself, there is a problem that it may reach the wear life relatively early.

Further, the double seal type rolling bearing has a problem that the inner ring and the outer ring have to have a dedicated shape and structure, which is a so-called special bearing, and the cost is high even when this bearing is used. .

The present invention has been made in view of the above situation, and is used in an environment exposed to a liquid such as a cleaning liquid under an inexpensive structure in which simple parts are added to a standard rolling bearing. Also aims at providing a rolling bearing device capable of preventing the occurrence of grease leakage.

[0010]

In order to achieve the above object, in a rolling bearing device of the present invention, a rolling bearing having seals attached to both ends in the axial direction and an inner ring of the rolling bearing are fitted and fixed. On the shaft, there is provided a pair of annular slingers fitted and fixed to both sides of the rolling bearing so as to sandwich the rolling bearing, and the base portion which is a fitting portion of the slinger with respect to the shaft is substantially equivalent to the inner ring of the rolling bearing. Having a wall thickness, the outer peripheral portion of the slinger reaches up to the vicinity of the outer periphery of the outer ring of the rolling bearing, and a flat surface is formed on the inner surface near the outer periphery of the slinger so as to face the end face of the outer ring with a predetermined gap, In addition, a convex curved surface that is substantially continuous with the chamfered portion on the outer periphery of the end portion of the outer ring is formed on the outer surface near the outer peripheral portion (claim 1).

In the present invention, the surface of the inner surface of the slinger closer to the shaft center than the flat surface is separated from the outer surface of the seal mounted on the rolling bearing toward the shaft center. The configuration (claim 2) can be suitably adopted.

According to the present invention, a standard sealed type rolling bearing is used, and liquid is efficiently splashed on both sides of the rolling bearing, and
It is intended to achieve the intended purpose by providing a slinger that constitutes a labyrinth seal with the outer ring.

That is, in the present invention, slingers are provided on both sides of the shaft to which the inner ring of the hermetically sealed rolling bearing is fitted and fixed, and the outer peripheral portion of the slinger is brought close to the outer periphery of the outer ring of the rolling bearing. A flat surface is formed on the inner surface in the vicinity of the outer peripheral portion of the slinger so as to face the end surface of the outer ring with a predetermined gap, whereby a labyrinth seal is formed between the outer ring end surface and the inner surface of the slinger. Further, by forming a convex curved surface on the outer surface of the slinger in the vicinity of the outer peripheral portion so as to be substantially continuous with the chamfered portion on the outer periphery of the end portion of the outer ring, the liquid from the outside can be efficiently repelled. With this configuration, the external liquid hardly enters between the slinger and the rolling bearing, and thus it is possible to prevent the liquid from entering the inside of the rolling bearing and causing grease leakage.

The slinger according to the present invention is different from the generally used slinger in which a simple plate-like member is bent, and has a wall thickness of a base portion which is a fitting portion with respect to the axis of the slinger. , By making the inner ring of the rolling bearing to be almost the same, the slinger has sufficient rigidity,
It prevents the slinger from falling when it is fitted on the shaft or clamped in the axial direction via a sleeve, etc., and between the flat surface formed on the inner surface near the outer periphery and the outer ring end surface. It is possible to form a minute gap for forming an effective labyrinth seal.

According to the second aspect of the invention, the surface of the inner side surface of the slinger facing the outer ring end surface that is closer to the shaft center than the flat surface is located at the shaft center with respect to the outer surfaces of the hermetic seals at both ends of the rolling bearing. By making the shape more distant toward the inside, it is possible to prevent the external liquid from being drawn into the inside by the capillary phenomenon through the labyrinth seal portion, and it is possible to further secure the above-mentioned effect. it can.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an axially parallel sectional view of an embodiment in which the present invention is applied to a ball bearing.

The rolling bearing 100 is equivalent to the conventional standard sealed type ball bearing shown in FIG. 2, in which a plurality of balls 3 are held by a cage 4 between an inner end 1 and an outer ring 2. Of the outer ring 2 and the raceway surface 1a formed on the outer circumference of the inner ring and the raceway surface 2a formed on the inner circumference of the outer ring 2 in such a state that the inner circumference of both ends of the outer ring 2 The annular hermetic seal 5 is mounted and fixed on the outer periphery of the seal groove 21 formed in the above, and the annular space surrounded by the inner ring 1 and the outer ring 2 and the hermetic seals 5 on both sides is filled with grease.

The hermetic seal 5 is formed by integrally molding an elastic material 52 such as NBR or silicon rubber on a core metal 51, and a lip 52a formed on the inner periphery of the core seal 51 slides on the shoulder portion 11 on the outer periphery of the inner ring 1. It is configured to make dynamic contact.

When the inner ring 1 and the outer ring 2 are used in an environment where they are exposed to a liquid such as an acid solution, the materials commonly used for rolling bearings that require corrosion resistance of this kind,
For example, it is preferable to use SUS630 or the like, the ball 3 is made of ceramics, and the cage 4 is made of fluororesin or polyamide resin when a resin cage is used as shown in the figure. When using a container, SUS304 or the like is desirable. Further, as the grease, it is preferable to use a food grade grease when it is used in a food production line.

In the standard sealed ball bearing 100 as described above, the inner ring 1 is used by being fitted and fixed to the rotary shaft S, and the ball bearing 100 is sandwiched by the rotary shaft S from both sides. The two slingers 200 are fitted and fixed to.

Each slinger 200 has an annular shape as a whole, a through hole 7 for fitting into the rotating shaft S is formed in the center thereof, and a boss-like base body is formed around the through hole 7. The thickness of the portion 8 is substantially equal to the thickness of the inner ring 1 of the rolling bearing 100. The disc portion 9 formed integrally with the outer periphery of the base portion 8 has its outer peripheral portion reaching the vicinity of the outer periphery of the outer ring 2 of the rolling bearing 100.

The inner side surface of the disk portion 9 is a flat surface 91 facing the end surface 22 of the outer ring 2 of the rolling bearing 100 with a slight gap in the vicinity of the outer peripheral portion.
An inclined surface 92 that is separated from the outer surface of the hermetic seal 5 mounted on the rolling bearing 100 toward the axial center.
Has become.

Further, the outer surface of the disc portion 9 is formed by a convex curved surface 93 which is substantially continuous with the chamfered portion 23 on the outer periphery of the end portion of the outer ring 2 of the rolling bearing 100 in the vicinity of the outer peripheral portion thereof. The outer surface is connected to the base portion 8 by a curved surface 94.

The material of the slinger 200 is not particularly limited, but when it is used in an environment exposed to an acidic solvent or the like, SUS630 or the like is used in the same manner as the inner and outer rings 1 and 2 of the ball bearing 100. It is preferable that

In the slinger 200 according to the embodiment of the present invention described above, the thickness of the base portion 8 in which the through hole 7 for fitting and fixing the rotary shaft S is formed is the ball bearing 100.
Since the inner ring 1 is formed to have the same thickness as that of the inner ring 1, it has high rigidity, and is axially positioned together with the ball bearing 100 at the time of fitting and fixing to the rotating shaft S, or through the slinger 200 and a spacer or the like. Even if tightened as much as possible, the disk part 9
Therefore, it is possible to stably form a minute gap as designed between the flat surface 91 of the inner side surface near the outer periphery and the end surface 22 of the outer ring 2 without falling.

According to the embodiment of the present invention described above, the slinger 200 rotates together with the inner ring 1 by the rotation of the rotating shaft S, and the centrifugal force of the slinger 200 causes a chamfered portion of the outer periphery of the outer ring 2 to pour the liquid pouring from the outside. 23 can be efficiently blown off from the outer surface having the convex curved surface 93 that is substantially continuous with 23. In addition, a minute gap formed between the flat surface 91 of the inner surface of the slinger 200 and the end surface 22 of the outer ring 2 functions as a labyrinth, and the liquid is prevented from entering between the slinger 200 and the outer ring 2 to the inside. Can be prevented,
Moreover, since the flat surface 91 faces the end surface 22 of the outer ring 2, there is a fixed gap, and the inside of the gap is separated from the outer side surface of the hermetic seal 5 by the inclined surface 92 toward the axial center. Since it gradually becomes wider, it is possible to prevent the external liquid from being drawn in due to the capillary phenomenon.

As a result of the above, the ball bearing 100 and the slinger 20
Almost no external liquid penetrates between 0 and 0. Therefore, even if a standard sealed type is used as the ball bearing 100 without using a special type such as a double seal type, almost no liquid is reached up to the sealed seal 5. Ball bearing 1
It is possible to reliably prevent the liquid from entering the inside of the ball bearing 00, so that the grease in the ball bearing 100 does not leak outside.

In the above embodiment, an example in which the present invention is applied to a ball bearing has been shown, but it goes without saying that the present invention is equally applicable to other rolling bearings.

[0029]

As described above, according to the present invention, a slinger having a base portion having the same thickness as the inner ring is fitted and fixed on both sides of a standard sealed type rolling bearing. It is fitted and fixed to the shaft, the outer peripheral part of the slinger is brought to near the outer ring outer periphery, and it faces the inner surface of the slinger near the outer peripheral part of the slinger with a predetermined gap from the end face of the outer ring. A flat surface is formed, and a convex curved surface that is approximately continuous with the chamfered portion of the outer periphery of the outer ring end is also formed on the outer surface of the slinger in the vicinity of the outer peripheral portion. Since the rigidity of the base portion is high even when tightened through the gap, the gap between the above-mentioned flat surface and the outer ring end face can be stably made to have a required minute dimension, and this gap allows the labyrinth against the external liquid. To form a seal with it is possible to prevent the penetration of the liquid, it is possible to flick the external liquid efficiently by the convex curved surface is formed on the outer side of the slinger peripheral portion near during rotation of the rotating shaft.

As a result of the above, the rolling bearing is protected by the slingers located on both sides of the rolling bearing, and the external liquid hardly penetrates into the sealing seal. It is possible to reliably prevent the infiltration of liquid, and it is possible to prevent the grease inside the bearing from leaking out, and under a simple and inexpensive structure, in an environment exposed to liquid, and It is possible to obtain a rolling bearing device which is not allowed to leak grease and which can be used, for example, in a washing process of bottle beverages.

[Brief description of drawings]

FIG. 1 is an axially parallel sectional view of an embodiment of the present invention.

FIG. 2 is an axially parallel sectional view showing a configuration example of a conventional sealed type ball bearing.

[Explanation of symbols]

100 ball bearings 1 inner ring 2 outer ring 21 seal groove 22 Edge 23 Chamfer Three balls 4 cage 5 hermetic seal 200 slinger 7 through holes 8 Base part 9 disk part 91 Flat surface 92 slope 93 Convex curved surface S axis

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akira Yamamoto             3-5-8 Minamisenba, Chuo-ku, Osaka-shi, Osaka               Koyo Seiko Co., Ltd. F term (reference) 3J016 AA01 BB17 CA02 CA03 CA06                       CA08

Claims (2)

[Claims] 1. A rolling bearing having seals mounted on both ends in the axial direction, and an inner ring of the rolling bearing is fitted and fixed on a shaft on which the rolling bearing is sandwiched so as to sandwich the rolling bearing. A pair of annular slingers is provided, the base portion that is a fitting portion for the shaft of the slinger has a wall thickness approximately equal to the inner ring of the rolling bearing, and the outer peripheral portion of the slinger is near the outer periphery of the outer ring of the rolling bearing. A flat surface is formed on the inner surface in the vicinity of the outer periphery of the end surface of the outer ring with a predetermined gap facing the end surface of the outer ring. A rolling bearing device having substantially continuous convex curved surfaces. 2. A surface of the inner surface of the slinger closer to the shaft center than the flat surface is separated from an outer surface of a seal mounted on the rolling bearing toward the shaft center. The rolling bearing device according to claim 1.