JPS5846266A - Dust sealing apparatus for bearing box - Google Patents

Abstract

PURPOSE:To obtain a seal capable of sealing a bearing box against dust effectively in a contactless manner, by forming a plurality of fins around the outer circumference of a rotatable labyrinth element, and locating an inlet to a gap of the labyrinth seal near the region where the fins are turned. CONSTITUTION:A hollow space consisting of pocket (b) is formed between a bearing box 4 and a rotatable labyrinth element 5 inside an outer end cover 7, and fins 8 are formed radially around the outer circumference of the labyrinth element 5. Resultantly, when the fins 8 of the labyrinth element 5 are turned with rotation of the element 5, a large centrifugal force is produced in the pocket (b) and a gap (a), so that foreign matter introduced into the bearing box from the clearance at the top of the outer end cover 7 is repelled to the outside by the fins 8 and foreign matter intruding into a passage (c) is also repelled to the outside in the same way by the fins 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dustproof device for a bearing box, and more particularly to a novel labyrinth seal structure with excellent dustproof and waterproof capabilities.

A dustproof device for a bearing box is required to have the function of retaining the internal lubricant and at the same time preventing the intrusion of foreign matter from the outside. Conventional sealing methods used in dustproof devices include contact type seals in which a soft material such as rubber or felt is interposed between the shaft and the bearing box; They are broadly classified into non-contact type seals that provide extremely small gaps, and labyrinth seals are often used as a representative example of the latter. The above-mentioned contact type seal has good lubricant retention ability and dustproof performance until the contact portion wears out and creates a gap, but has the drawback of high frictional resistance during rotation. Furthermore, non-contact type seals are superior in that they have less frictional resistance during rotation, but because they have a structure that leaves gaps, their dustproof performance cannot be said to be sufficient.

In view of the above-mentioned problems, the present invention aims to provide a dustproof device for a bearing box having a labyrinth seal structure with excellent dustproof and waterproof ability. The entrance of the gap in the labyrinth V-ru is placed near the rotation area of the fin, and foreign matter that enters the gap due to the centrifugal force generated by the fin as the rotating labyrinth element rotates is prevented from entering the gap along with the surrounding atmosphere. This is a dust prevention device for bearing boxes that is designed to forcefully discharge dust.

Margin below The present invention will be explained below based on examples.

FIG. 1 shows an example in which the present invention is applied to a bearing box for a carrier roller.

The roller pipe (1) of the carrier roller has shafts (
A bearing box (4) containing a ball bearing (3) is fitted between the bearing box and the ball bearing (3). A labyrinth element (6) on the rotating side of a disc or mold having a notch in the center and a bent part in the shape of a cross section on the inner circumferential side is tightly fitted into this bearing box (4), and a roller pipe ( The shaft (2) is configured to be rotatable together with the shaft (2).
The 0-rotation side labyrinth element (61) and the stationary side labyrinth element (61) are tightly fitted with a fixed side labyrinth element (6) which is disk-shaped and has a notch in the center and a bent part with a cross-sectional opening shape on the outer periphery. 61 bent portions are combined to form a labyrinth (2) of minute gaps to constitute a labyrinth seal.Furthermore, the labyrinth element (6) on the rotating side and the labyrinth element (6) on the stationary side are covered. Roller pipe (rito shaft)
In order to close the outward space between the shaft (2) and the shaft (2), an outer end cover 17) having a dish-shaped outer periphery is tightly fitted onto the shaft (2).

With the above configuration, III (a) is formed between the tip of the outer end cover (71) and the inner surface of the roller pipe (1), and serves as an entry point for foreign matter. ) and the rotation-side labyrinth element (6), a pocket (b) is created, and the above-mentioned labyrinth (2) is formed between the inner surface of the outer end cover () and the rotation-side labyrinth element (5).
A passage (C) communicating with the ball bearing 13) is formed, and a grease reservoir (3) is provided between the ball bearing 13) and the rotating labyrinth element +61.

In this embodiment, the above-mentioned space part of the kerato ②, as shown in FIG. As the roller pipe 11) rotates, the fins (8
) becomes a rotating jin and ′.

To explain the function of the anti-seating device having the above-mentioned configuration, the shaft to which the outer end cover (7) and the fixed-side labyrinth element (6) are fixed is the fixed side, and the rotating-side labyrinth element (6) is ) is the roller pipe I'll pass through the bearing box (4)
The passage (C) and the labyrinth (2) have a rotating side labyrinth element (a foreign object that enters ζξ from the rotating dream ζ of 51 is always subject to centrifugal force in the direction of the gap (a), which is the entry point). However, since the centrifugal force obtained is due to the rotation of only one side of the passage wall, it is weak and does not provide complete dustproofing power.However, the rotation side labyrinth element (61 fins)
8) rotates and a large centrifugal force is generated in the gap (a) and the pocket ■, and foreign matter that has entered through the gap at the tip of the outer end cover (7) is pushed out by the fins (8). In addition, foreign matter that tries to enter the passageway (C) is guided by this and similarly discharged, so that the dustproof ability is significantly improved and the intrusion of water and the like can also be prevented. Note that when the shaft (2) is arranged horizontally as shown, it is clear that foreign objects in the gap are discharged under the influence of gravity as well as the centrifugal force mentioned above at the lower position.

In addition, it is recommended that the shape, direction, etc. of the space (a) and the pocket (■) be appropriately selected so that the intruding foreign matter, etc., can be easily ejected when it is repelled by the centrifugal force of the fin (8 eyes ζ). For example, Fig. 3 shows an example in which the wall surface of the bearing box (4) is formed so that the four holes are enlarged so that the inlet of the gap (a) is a continuous curved surface. Incidentally, when a carrier roller equipped with a dustproof device having the configuration shown in FIG. 3 was installed and used outdoors in a place with a lot of dust, there was no intrusion of dust or water at all.

Although the dust prevention device of the present invention is applied to a carrier roller in the above example, it can also be applied to other bearing boxes. For example, as shown in Figure 4, a billow-shaped bearing box (1.
When applied to the - rotating side is the inner ring (1
Therefore, the rotating side labyrinth element provided with the fin rJ14 is fixed to the inner ring H.

Next, the outer end cover 97) for configuring the space II (a) and the l kerato
16). The fixed-side labyrinth element +11 for covering the rotating rotating labyrinth element O@ and forming a labyrinth (2) is fixed to the outer ring of the bearing box a- and becomes the fixed side. Therefore, the passage (C) is between I
It is the same as in the previous example that it is provided between ll (a) and l kerato () to reach the labyrinth (2), and here it is located at a position opposite to the fin.

The dustproof device with this configuration has exactly the same function as the above example, in which foreign matter that has entered the four cages is repelled to the outside by the rotating fins H, and
It has excellent dustproof and waterproof capabilities.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a carrier roller illustrating a dustproof device according to the present invention. FIG. 2 is an explanatory diagram of the rotating side labyrinth element according to the present invention. 3 and 4 are longitudinal sectional views showing other embodiments of the present invention, with FIG. 3 showing a carrier roller and FIG. 4 showing a billows type bearing box. In the figure, 1...Roller vibe, 2...Shaft, 3...Ball bearing, 4...Bearing box, 5.15...Rotating side labyrinth element, 6.16... Fixed side labyrinth Element, 7...
・Outer end cover, 8...Fin, a...Gap, b...
・Pocket, C...Passway, d...Grease reservoir, g...
·maze. Applicant Asahi Seiko Co., Ltd. Agent 1) Yoshihisa, -1: Figure 1 Figure 2 Figure 4

Claims (1)

[Scope of Claims] 1. In a labyrinth seal structure that combines a labyrinth element to which the bearing is rotationally narrowed and fixed and a labyrinth element to which the fixed side number ζ of the bearing is fixed, the outer peripheral part of the labyrinth element on the rotation side has a plurality of The gap entrance of the labyrinth seal is placed near the rotation area of the skeleton fin, and the centrifugal force generated by the fins as the labyrinth element on the rotation side rotates to prevent foreign objects, etc. that enter the gap entrance direction. A dust-proofing device for a bearing box, which is characterized by forcibly discharging the dust along with the atmosphere.- Two outer end covers fixed to the fixed side number and one end of the bearing box cover the labyrinth elements on the fixed side and rotating side from the first, and A dustproof device for a bearing box according to claim 1, wherein the seal gap entrance is extended to near the outer periphery of a rotating side labyrinth element provided with fins. 3. On the outer periphery of the rotating side or fixed side labyrinth element A dustproof device for a bearing box according to claim 1, wherein an outer end cover is attached or protruded to cover the rotation range of the fin to form a space.