JPH05237960A - Manufacture of bearing with two-layer rubber ring - Google Patents

Abstract

PURPOSE:To provide a method applicable to manufacture of a bearing, having a two-layer rubber ring, which is used as a feed roller for sheets or cards, where thicknesses of inner and outer peripheral layers of the rubber ring are uniform on the whole periphery and inner and outer layers are integrated. CONSTITUTION:In an outer periphery of an outer ring of a rolling bearing 1, a rubber ring inner periphery layer 3a made at other place is embedded and adhered. The inner periphery layer 3a is brought in a state that heat treatment for vulcanization is not processed. The bearing 1 is inserted into a metal die 11 and melted rubber to be a rubber ring outer periphery layer is injected into a cavity 15 formed on the outer periphery of the rubber ring inner periphery layer 3a. Thereafter, the metal die 11 is heated so as to complete the vulcanization treatment of the inner and outer layers 3a, 3b of the rubber ring 3 so as to integrate the layers 3a and 3b. The inner periphery layer 3a and the outer periphery layer 3b are made of rubber having the same material but different in hardness. The metal die 11 is provided with a plurality of film gates 16 on an outer periphery face 15a of the cavity 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber-rolled bearing used as a feeding roller for bills, cards, etc. in an automatic payment machine, an automatic ticket gate, a card vending machine, a drafting machine, etc. The present invention relates to a method of manufacturing a layered bearing.

[0002]

2. Description of the Related Art Heretofore, as a rubber-wrapped bearing of this type, a rubber sleeve bonded to the outer circumference of a metal sleeve and press-fitted into the outer ring of a rolling bearing has been generally used when it is necessary to thicken the rubber. There is. According to this, unlike the case where the whole is made of rubber, there is no problem that the rubber ring is deformed into a flexed state due to insufficient rigidity, and good feed characteristics can be obtained. However, in order to use the metal sleeve, in addition to the step of adhering the rubber ring, a step of press-fitting the metal sleeve into the bearing is required, and it is necessary to grind the inner diameter surface of the metal ring to control the size of the interference. It becomes necessary and the manufacturing cost becomes high.

As a solution to these problems,
The present applicant has proposed a two-layer rubber wound bearing in which a rubber ring 3 having two layers of an inner peripheral layer 3a and an outer peripheral layer 3b is provided on the outer periphery of an outer ring 2 of a rolling bearing 1 as shown in FIG. The inner peripheral layer 3a has a high hardness, and the outer peripheral layer 3b has a low hardness. The rolling bearing 1 is a deep groove ball bearing, and the rolling element 5 held by a cage 6 is interposed between the inner ring 4 and the outer ring 2,
The seal 7 is provided.

According to this two-layer rubber wound bearing, the inner peripheral layer 3
The required rigidity can be obtained with "a", and the elasticity and high friction coefficient required for paper feeding can be obtained with the outer peripheral layer 3b having low hardness. The inner peripheral layer 3a and the outer peripheral layer 3b are integrated with each other by the heat of the molten rubber when the outer peripheral layer 3b is molded in the mold. Therefore, it becomes unnecessary to bond both layers 3a and 3b. Moreover, since the rubber ring 3 is molded directly on the outer periphery of the bearing 1, strict dimensional control is not required. For these reasons, the manufacturing is simple and the cost can be reduced.

[0005]

However, as shown in FIG. 3, since the gate 8 for molding the outer peripheral layer 3b of the rubber ring 3 is arranged on the width surface, the inner peripheral layer 3a of the inner ring 3a due to the heat of the injected rubber is formed. The melted portion spreads near the gate, and the thickness of the outer peripheral layer 3b increases near the gate 8. That is, the outer peripheral layer 3
A locally thick portion 3c is formed at b. in this way,
Since the thicknesses of the inner peripheral layer 3a and the outer peripheral layer 3b having different hardness are locally non-uniform, it is possible to make the thicknesses of both layers 3a and 3b uniform over the entire circumference and to further improve the characteristics. desired.

An object of the present invention is to provide a method for manufacturing a two-layer rubber-wound bearing in which the inner and outer peripheral layers of a rubber ring can be formed to have a uniform wall thickness over the entire circumference and the inner and outer layers can be integrated. Is to provide.

[0007]

A method for manufacturing a two-layer rubber wound bearing according to the present invention comprises a step of providing an inner peripheral layer of a rubber ring on an outer periphery of an outer ring of a rolling bearing, and a step of forming a rubber ring inside a mold in which the bearing is inserted. A step of injecting molten rubber to be a rubber ring outer peripheral layer into a cavity formed on the outer periphery of the rubber ring inner peripheral layer,
After this, a step of performing heat treatment on both the inner and outer layers of the rubber ring is included. The inner peripheral layer of the rubber ring is not subjected to the heat treatment for vulcanization until the outer peripheral layer is injected. The gate of the mold is arranged on the outer peripheral surface of the cavity.

[0008]

According to this manufacturing method, the outer peripheral layer of the rubber ring is molded and heat-treated while the inner peripheral layer of the rubber ring is not subjected to the heat treatment. The layers are integrally bonded, and the vulcanization process is completed to complete the rubber. Therefore, it becomes unnecessary to bond the inner peripheral layer and the outer peripheral layer. In addition, since the gate of the mold for molding the outer peripheral layer is placed on the outer peripheral surface, the gate position is far from the inner peripheral layer, and the melting point of the inner peripheral layer due to the heat of the injected rubber spreads near the gate. Is reduced, and the thicknesses of the inner and outer layers are uniform over the entire circumference.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. The manufacturing method of this embodiment is a method of manufacturing the two-layer rubber wound bearing having the configuration described above with reference to FIG.
To (E).

First, the outer surface 1a of the rolling bearing 1 shown in FIG. 2 (outer surface of the outer ring 2) is roughened by shot blasting (FIG. 1 (A)). Then, as shown in FIG. 1B, the adhesive 10 is applied to the bearing outer diameter surface 1a and dried. A thermosetting adhesive is used as the adhesive 10. The separately molded rubber ring inner peripheral layer 3a is press-fitted onto the outer periphery of the bearing 1 coated with the adhesive (see FIG. 1).
(C)). The rubber ring inner peripheral layer 3a is in a state where heat treatment for vulcanization is not applied.

Next, the bearing 1 having the rubber ring inner peripheral layer 3a fitted therein is placed in a mold 11 for forming an outer peripheral layer as shown in FIG. 1 (D). The mold 11 includes an upper mold 12 and a middle mold 1.
3 and lower mold 14. The middle mold 13 is fixed integrally with the upper mold 12, and the mating surface between the middle mold 13 and the lower mold 14 becomes a mold dividing surface PL when the mold is opened. Inside the mold 11, a rubber ring inner peripheral layer 3a set inside is formed.
A cavity 15 for molding the rubber ring outer peripheral layer 3b (FIG. 2) is provided on the outer periphery of the, and a gate 16 opening to the outer peripheral surface 15a of the cavity 15 is provided on the mating surface of the upper mold 12 and the lower mold 14 with a film. Formed as a gate. Also,
In the case of a pin gate, it is preferable that the number of pin gates is large for uniform molding, but in consideration of workability, the pin gates are provided at, for example, about 8 positions in the circumferential direction. In addition, the liner 17 that opens to the gate 16 includes the upper mold 12 and the middle mold 1.
It is formed between 3 and.

Molten rubber is injected into the cavity 15 of the mold 11, and the mold 11 is heated before the injected rubber which becomes the rubber ring outer peripheral layer 3b is completely cured. By this heating, the vulcanization process of the rubber ring inner peripheral layer 3a and the outer peripheral layer 3b is completed, and both layers 3a and 3b are completed as rubber. Further, this heating causes the inner peripheral layer 3a and the outer peripheral layer 3b to be integrally joined. Silicon rubber or the like is used for the rubber of each layer 3a, 3b. The adhesive 10 (FIG. 1 (B)) on the outer peripheral surface 1a of the bearing 1 is hardened in the above heating step, and the inner peripheral layer 3a is bonded to the bearing 1.

In this way, the bearing 1 on which the rubber rings 3 of the inner and outer two layers 3a and 3b are formed is taken out by opening the mold, and the outer diameter surface 3d of the outer peripheral layer 3b is grindstone 18 as shown in FIG. 1 (E). The two-layer rubber-wrapped bearing shown in FIG. 2 is completed by polishing with and scraping off the gate portion.

According to this manufacturing method, the rubber ring outer peripheral layer 3b is formed on the outer periphery of the rubber ring inner peripheral layer 3a which has not been subjected to the heat treatment for vulcanization, and the heat treatment is performed.
Since the inner and outer layers 3a and 3b are integrated, the bonding step is unnecessary. Therefore, the manufacturing process is simplified, and the connection between the inner and outer layers 3a and 3b is ensured. Each layer 3a, 3
For the rubber of b, the same material having different hardness is used. Therefore, the completed rubber ring 3 has the inner and outer layers 3
The boundary between a and 3b is completely integrated and cannot be visually discriminated.

Further, since the gate 16 of the mold 11 for molding the outer peripheral layer 3b is arranged on the outer peripheral surface, the gate position is far away from the inner peripheral layer 3a, and the inner peripheral layer 3a is heated by the heat of the injected rubber. The melting point is less likely to spread near the gate 16. Therefore, the thickness of each of the inner and outer layers 3a and 3b is uniform over the entire circumference, and even when rubbers having different hardness are used for the inner and outer layers 3a and 3b, uniform properties can be obtained over the entire circumference. Further, in this embodiment, since the gate 16 is a film gate, the uniformity can be further increased as compared with the case of the pin gate.

In the above embodiment, the rubber ring inner peripheral layer 3
Although a was molded at another location and bonded to the bearing 1, the inner peripheral layer 3
It is also possible to provide a on the outer circumference of the bearing 1 by insert molding, and thereafter to replace it with another mold to mold the outer peripheral layer 3a in the same manner as described above. Also, when insert molding is performed in this way,
The inner peripheral layer 3a may be formed by using a ring-shaped core or the like corresponding to the outer peripheral layer 3b, and the outer peripheral layer 3b may be molded by removing only the core while the mold is kept in the same mold.

[0017]

According to the method for manufacturing a two-layer rubber wound bearing of the present invention, the rubber ring outer peripheral layer is formed on the outer periphery of the inner peripheral layer of the rubber ring, and the heat treatment is performed. Both the inner and outer layers are integrated during the heat treatment. for that reason,
The adhesive process is not required, the manufacturing process is simplified, and the bonding between the inner and outer layers is ensured. Moreover, since the gate of the mold for molding the outer peripheral layer is arranged on the outer peripheral surface, the thickness of the inner and outer layers is uniform over the entire circumference, and even when rubber of different hardness is used for the inner and outer layers, Uniform characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method for manufacturing a double-layer rubber wound bearing according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a two-layer rubber wound bearing manufactured by this manufacturing method.

3 (A) and 3 (B) are a front view and a sectional view, respectively, showing a two-layer rubber wound bearing manufactured by a conventional manufacturing method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rolling bearing, 2 ... Outer ring, 3 ... Rubber ring, 3a ... Inner peripheral layer, 3b ... Outer peripheral layer, 11 ... Mold, 15 ... Cavity,
15a ... Outer peripheral surface, 16 ... Gate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B29D 23/00 7344-4F F16C 13/02 8613-3J 27/06 B8613-3J // B29K 21 : 00 105: 24 B29L 31:04 4F

Claims (1)

[Claims] 1. A process of providing an inner peripheral layer of a rubber ring, which has not been subjected to heat treatment for vulcanization, on the outer periphery of an outer ring of a rolling bearing,
In the mold in which the bearing is inserted, a process of injecting a molten rubber to be a rubber ring outer peripheral layer into a cavity formed on the outer periphery of the rubber ring inner peripheral layer, and a heat treatment of both inner and outer layers of the rubber ring are performed thereafter. A method of manufacturing a two-layer rubber wound bearing, wherein the mold has a gate on an outer peripheral surface of the cavity.