JPH09151938A - Roller bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the form of an outer ring while ensuring sealing performance for duct or the like, and use a carbide material for the outer ring at low cost to make the outer ring oilless. SOLUTION: This roller bearing device is applied to a roller bearing device having a roller 2 interposed between an outer ring 3 and a shaft 1, and a collar 6 and a side plate 7 adjacent to the lateral surfaces on both sides of the outer ring 3 provided on the shaft 1. The outer diameters of the collar 6 and the side plate 7 are set smaller than the outer diameter of the outer ring 3. Seals 8 making contact with the lateral surfaces of the outer ring 3 are provided on the outer diameter surfaces of the collar 6 and the side plate 7. The outer ring 3 is formed of a carbide material, and has a groove part 5 on the outer diameter surface. A solid lubricating agent 9 is sealed within the bearing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing device used in various devices such as a buncher twisting machine for guiding wire rods and cam followers.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 5 and 6, a roller bearing device for guiding a wire rod in a twisting machine has been used. The roller bearing device shown in FIG.
An outer ring 53 is provided on the outer periphery of the shaft via rollers 52, and a flange 51a and side plates 54, which are close to the width surfaces on both sides of the outer ring 53, are provided at the tip and the intermediate portion of the shaft 1. The outer ring 53 has a widened portion 53a on both sides of the outer diameter portion, and the widened portion 53a covers the outer periphery of the flange 51a and the side plate 54 to form a labyrinth seal 55. A groove portion 57 for guiding a wire rod is formed on the outer diameter surface of the outer ring 53. Inside the bearing, the shaft 51
A greasing hole 56 is provided in the to greasing the raceway surface. In the example of FIG. 6, instead of providing the labyrinth seal 55 in the example of FIG. 5, a seal groove 58 is provided on the proximal end inner diameter surface of the expanded portion 53a of the outer ring 53 and is in contact with the flange 51a and the outer diameter surface of the side plate 54, respectively. Rubber seals 59, 59 are provided.

[0003]

In this type of roller bearing device, the steel wire is guided by the groove 57 provided in the outer diameter portion of the outer ring 53, but since it is guided without lubrication, the space between the steel wire and the outer ring 53 is reduced. Due to slippage on the outer ring 53
In that case, the groove 57 is worn early due to insufficient hardness. Therefore, it is desired to reduce the wear of the groove 57 of the outer ring 53. Further, if the wear powder generated by the above-mentioned wear enters the inside of the bearing, the life of the bearing is shortened. Therefore, it is necessary to prevent the wear powder from entering the inside of the bearing. Therefore, as described above, the expanded portion 53 and the seal 59 are attached to the outer ring 53.
However, if the outer ring 53 is made of a hard material, the machining is difficult and the cost is high, and mass production cannot be achieved. In particular, FIG.
When the seal groove 58 is formed as in the example of FIG. 5, it is actually difficult to use a material harder than the bearing steel because the outer ring shape becomes very complicated. Considering the manufacturing cost, the labyrinth seal 55 of FIG. There is a limit to the shape to provide. However, since the labyrinth seal 55 is a non-contact seal, the effect of preventing wear dust from entering is not sufficient. Furthermore, this type of roller bearing device is provided with a greasing hole 56 for grease lubrication. However, grease lubrication has problems of periodic greasing and contamination of the surrounding area due to grease leakage, which is extremely difficult to maintain. It will be troublesome.

The present invention is intended to solve the above-mentioned problems, and to secure the sealing performance such as dustproof, to simplify the shape of the outer ring and to use a hard material for the outer ring at low cost. To aim. Another object of the present invention is to prevent the wear of the groove portion on the outer diameter surface of the outer ring by making the material of the outer ring hard. Still another object of the present invention is to achieve lubrication by non-greasing, reduce maintenance frequency, and save labor.

[0005]

In the roller bearing device of the present invention, a plurality of rollers are interposed between an outer ring and a shaft, and a collar and side plates close to the width surfaces on both sides of the outer ring are provided at the tip and intermediate portions of the shaft. In the roller bearing device provided in each of the above, the outer diameters of the collar and the side plate are smaller than the outer diameter of the outer ring, and the outer diameter surfaces of the collar and the side plate are respectively provided with seals contacting the width surface of the outer ring. . According to this structure, since a contact seal is provided, a reliable sealing effect can be obtained. For example, it is possible to reliably prevent the invasion of abrasion powder and the like caused by abrasion of the outer diameter surface of the outer ring. Since the seal is provided on the outer diameter surface of the collar and the side plate and is in contact with the width surface of the outer ring, the shape of the outer ring can be made very simple. Therefore, even if a super hard material or the like is used for the outer ring, there is no difficulty in processing, the outer ring of the super hard material can be realized at low cost, and wear can be reduced. In particular, when a groove portion for guiding a wire rod is provided on the outer diameter surface of the outer ring, the outer ring is made of a super hard material so that the wear of the groove portion due to the sliding of the wire rod can be prevented and the shape of the groove portion can be maintained for a long time. When using this roller bearing device in a twisting machine,
Although the contact between the groove of the outer ring and the wire is performed under severe conditions,
Even in that case, the wear resistance of the groove portion can be enhanced to a satisfactory level by making the outer ring a super hard material. In the roller bearing device having the above structure, a solid lubricant may be enclosed in a space surrounded by the outer ring, the shaft, the collar, and the side plate. By using the solid lubricant in this way, it is possible to achieve non-greasing.

[0006]

FIG. 1 shows a first embodiment of the present invention.
It will be described based on. The shaft 1 serves as a stud, the base end of which is formed in the male screw portion 1a, and is fixed to a frame (not shown) of various devices with a nut. The outer diameter surface near the tip of the shaft 1 is the raceway surface 1b of the roller 2, and the raceway surface 1b
An outer ring 3 is provided on the outer periphery of the roller through a plurality of rollers 2. Each roller 2 is held in a pocket of a cage 4. The outer ring 3 is made of a thick-walled cylindrical body made of a cemented carbide material such as cemented carbide, and has a groove portion 5 for guiding the wire rod formed on the outer diameter surface and chamfered on both side edges of the outer diameter surface. is there. Groove 5
Has a U-shaped or V-shaped cross-sectional shape. The cemented carbide is a kind of an extremely hard alloy and a sintered alloy in which a metal element carbide powder and a metal powder are appropriately mixed and sintered. Carbides of 4A, 5A and 6A group metals in the periodic table, and F
Although metals such as e, Ni, and Co are used, WC-Co
The system has the best mechanical properties. Besides, WC-Tac
-Co, WC-TiC-Co, WC-TiC-TaC-
Alloys such as Co are also used.

The shaft 1 is provided with a collar 6 and side plates 7 which are close to the width surfaces on both sides of the outer ring 3 at the tip and the intermediate portion, respectively. The collar 6 is attached to the tip end surface of the shaft 1 with a screw member or the like, and the side plate 7 is fitted in a fitting groove 1c formed on the outer diameter surface of the shaft 1 as a ring-shaped member. These collar 6 and side plate 7
Has an outer diameter smaller than the outer diameter of the outer ring 3, and is provided with ring-shaped seals 8 and 8 that are in contact with the width surface of the outer ring 3 in a fitted state on the outer diameter surface. The seal 8 is made of an integral elastic body such as rubber provided with a lip portion 8b extending from the inner diameter portion of the inner surface of the mounting portion 8a to the diagonal outer diameter side, and the tip of the lip portion 8b is brought into contact with the width surface of the outer ring 3. is there. A core metal 8c is embedded in the outer diameter portion of the mounting portion 8a by insert molding or the like. A solid lubricant 9 is enclosed in a space surrounded by the outer ring 3, the shaft 1, the collar 6, and the side plate 7 of the roller bearing device. As the solid lubricant 9, for example, solid grease obtained by heat-treating a mixture of grease and ultra-high molecular weight polyolefin is used. The ultra high molecular weight polyolefin preferably has a number average molecular weight of 1 × 10 ^{6 to} 5 × 10 ⁶ .

According to the roller bearing device of this construction, since the outer ring 3 is made of a superhard material, the wear resistance is improved, and even if it is used in a twisting machine or the like, the groove 5 guides a wire such as a steel wire. The wear of the groove portion 5 is small, and the shape of the groove portion 5 is maintained for a long time. Moreover, the generation of abrasion powder is small. Outer ring 3 is groove 5
Since it has a simple shape of a thick-walled cylindrical shape only formed on the outer diameter surface, it can be easily manufactured using a cemented carbide material. Also,
Since the contact-type seal 8 is provided, foreign matter such as abrasion powder is reliably prevented from entering the bearing, and the life of the bearing can be extended. Since the solid lubricant 9 is used to lubricate the bearing, it is possible to achieve no lubrication. The solid lubricant 9 is such that the lubricating oil gradually comes out from the surface of the solid resin, there is no excess grease that scatters even when subjected to centrifugal force, and a proper amount of lubricating oil is constantly supplied to the raceway surface 1b and the like. As a result, long-term stable lubrication characteristics can be obtained.

Although the groove portion 5 is provided on the outer diameter surface of the outer ring 3 in the above embodiment, the outer ring 3 may be used as a cam follower or a wheel without the groove portion 5. With this structure, the outer ring 3 is a narrow and compact cam follower, and the above-described effects can be obtained. Also,
Although the cage 4 is used in the above-described embodiment, when the solid lubricant 9 is used, the cage 4 may be omitted and the solid lubricant 9 may be used to retain the roller 2 as shown in FIG.

FIG. 3 shows another embodiment. In this example, instead of using the solid lubricant 9 in the embodiment of FIG. 1, normal grease is used for lubrication. Therefore, the greasing hole 10 is provided in the shaft 1. The greasing hole 10 has a main path portion 10a that penetrates the shaft center portion of the shaft 1,
Branch path section 1 opened from the main path section 10a to the raceway surface 1b
0b and a branch passage portion 10c opened from the main passage portion 10a to the outer diameter surface of the shaft 1 outside the bearing. With such a configuration, the above-described respective effects described in the first embodiment can be obtained, except for the non-greasing by the solid lubricant 9.

FIG. 4 shows an example of a buncher type twisting machine using this roller bearing device. In this twisting machine, a plurality of strands 22 fed from a supply roll 21 are gathered in a twisting roller 23 having a groove, and then false twisted by a false twisting device 24, and then a pair of rotating frames of a buncher body. It is wound around 25 wire rod guide rollers 26 and 27 and continuously twisted while swinging in a balloon shape, and the stranded wire 29 drawn by the capstan 28 is wound around the take-up reel 31 through the traverser 30. It is the one. The roller bearing device of the above embodiment is used for any one of the twisting roller 23 and the wire rod guide rollers 26, 27.

[0012]

EXAMPLES The grease in the solid lubricant used in the above embodiment is not particularly limited, and examples thereof include grease thickened with soap or non-soap, such as lithium soap-diester type, lithium soap-mineral oil type, and sodium. Soap
Mineral oil type and various other greases are used. Also,
The ultra-high molecular weight polyolefin in the solid lubricant may be polyethylene, polypropylene, polybutene or copolymers or mixtures thereof, and also has a crystalline, high-molecular weight crystalline having an aitotactic structure by their stereospecific polymerization. It may be one. In order to appropriately suppress the oil separation rate of the oil leaching on the oily surface, the solid lubricant may be mixed with an additive such as a solid wax of waxes (low wax) or a low molecular weight polyolefin containing the solid wax. As a preferable example of the solid lubricant, for example, one manufactured as follows is used. That is, the particle size is 30μ
m ultra-high molecular weight polyolefin (Mitsui Petrochemical Industrial Co., Ltd .: Miperon) 20 parts, low molecular weight polyethylene-containing solid wax (Mitsui Kasei Co., Ltd .: Sun wax) 6 parts and drip 183 ° C. grease (lithium soap-mineral oil system) )
74 parts are mixed as a raw material, and in the embodiment shown in FIG. 1, the mixture is filled in the remaining gap in which the cage 4 and the rollers 2 are arranged in the space surrounded by the outer ring 3, the shaft 1, the collar 6, and the side plate 7. After enclosing, the roller bearing device was heated for 30 minutes in a constant temperature bath at 150 to 180 ° C. to solidify the above mixture to obtain solid grease as solid lubricant 9.

As the material of the outer ring 3 in the roller bearing device of the above embodiment, the following super hard material having wear resistance can be used. When this cemented carbide was tested in a Savan type wear tester under the following conditions, it was confirmed that the amount of wear was extremely small with respect to the bearing steel as shown in Table 1. The tester measures the amount of wear by bringing the following test rolls into contact with a flat plate-shaped test piece under pressure to cause slippage. The test conditions with the Savan type abrasion tester are as follows. Load (F): 78N (8kgf) rotational speed (N): 1670rpm lubricating oil: machine oil surface pressure (Pmax): 210MPa (21.4kgf / mm 2) sliding speed (V): 210m / min Test Roll: bearing steel Test piece: 2 types (see Table 1)

[0014]

[Table 1]

[0015]

According to the roller bearing device of the present invention, the outer diameters of the collar and the side plate are smaller than the outer diameter of the outer ring, and the outer diameter surfaces of the collar and the side plate are respectively provided with seals that are in contact with the width surface of the outer ring. While ensuring sealing performance such as dustproof, the outer ring has a simple shape, and a hard material such as cemented carbide can be used for the outer ring at low cost. Therefore, the wear resistance can be improved to improve the bearing life, reduce the maintenance frequency, and save labor. Further, as described above, the wear is reduced, and the contact-type seal enhances the effect of preventing foreign matter from entering. Therefore, the life of the bearing can be extended, the maintenance frequency can be reduced, and the labor can be saved. When a solid lubricant is used to lubricate the bearing, the maintenance frequency can be reduced and the labor can be saved due to no lubrication. Also, with the non-greasing, it is no longer necessary to provide a greasing hole in the shaft,
This reduces processing costs. When a groove is provided on the outer ring and used for guiding a wire rod, especially when used for a twisting machine,
Although the groove of the outer ring is subjected to severe friction with the wire,
Also in this case, a satisfactory wear prevention effect can be obtained by using a hard material for the outer ring.

[Brief description of the drawings]

FIG. 1A is a cutaway side view of a roller bearing device according to a first embodiment of the present invention, and FIG. 1B is a partially enlarged cutaway front view thereof.

FIG. 2 is a partially cutaway front view of a roller bearing device according to another embodiment.

FIG. 3 is a cutaway side view of a roller bearing device according to still another embodiment.

FIG. 4 is an explanatory diagram of a schematic configuration of a twisting machine using the roller bearing device of the embodiment.

FIG. 5 is a cutaway side view of a conventional example.

FIG. 6 is a cutaway side view of another conventional example.

[Explanation of symbols]

1 ... Shaft, 2 ... Roller, 3 ... Outer ring, 4 ... Retainer, 5 ... Groove part,
6 ... Tsuba, 7 ... Side plate, 8 ... Seal, 9 ... Solid lubricant

Claims (4)

[Claims] 1. A roller bearing device in which a plurality of rollers are interposed between an outer ring and a shaft, and flanges and side plates which are respectively close to width surfaces on both sides of the outer ring are provided at a tip end and an intermediate portion of the shaft, respectively. A roller bearing device, wherein the outer diameters of the collar and the side plate are smaller than the outer diameter of the outer ring, and seals are provided on the outer diameter surfaces of the collar and the side plate, respectively, in contact with the width surface of the outer ring. 2. The roller bearing device according to claim 1, wherein the outer ring is made of a super hard material, and a groove portion for guiding a wire rod is provided on an outer diameter surface of the outer ring. 3. The roller bearing device according to claim 1, wherein the outer ring is a guide roller for guiding a wire rod of a twisting machine. 4. A solid lubricant is enclosed in a space surrounded by the outer ring, the shaft, the collar, and the side plate.
Alternatively, the roller bearing device according to claim 3.