JP2003343546A - Resin roller and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive resin roller with high accuracy having very small deformation to be caused by frictional heat. <P>SOLUTION: The resin roller is provided with a shaft 1, a cylindrical resin roller body 2, and a bearing member 3 which is welded to the roller body 2 and freely rotatable around the shaft center C of the shaft 1 together with the roller body 2. The bearing member 3 has a sliding contact inner tube 4 made of a polyphenylene sulfide resin brought into sliding contact with the shaft 1, and an outer tube 5 made of the same resin as the roller body 2 to be welded to the roller body 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin roller and its manufacturing method.

[0002]

2. Description of the Related Art As shown in the longitudinal sectional views of resin rollers of FIGS. 4, 5 and 6, a rotary resin roller having a metal shaft 41 as a central axis and a roller body 42 rotating around the shaft 41 is A pair of bearing members 43, 43 are interposed between the shaft 41 and the resin roller body 42. As the conventional bearing member 43, a metal bearing 44 (FIG. 4),
Resin bearing 45 made of the same material as the roller body 42 (Fig. 5) or metal insert resin bearing in which a resin bushing main body 47 made of the same material as the roller body 42 is fitted onto the metal bush 46 (Fig. 6). , Are used. The material of the roller body 42 is made of PPE (polyphenylene ether) resin, which is an inexpensive resin roller.

[0003]

When the metal bearing 44 shown in FIG. 4 is used as the bearing member 43, especially if it is a roller bearing, the bearing itself is expensive, and the resin roller can be manufactured at a low cost. In addition, there is a problem that the lubricating oil used for the bearing 44 oozes out and adheres to the resin roller main body 42, causing cracks due to stress corrosion. Further, as shown in FIG. 5, when the resin bearing 45 made of the same material (PPE) as the roller body 42 is used, the roller body 42 and the resin bearing 45 can be easily welded and can be manufactured at a low cost. The temperature is low at about 125 ° C., and when frictional heat is generated between the shaft 41 and the shaft 41, the bearing member 43 may be deformed. Furthermore, as shown in FIG.
The metal insert resin bearing has a problem that abnormal noise (metal noise) is generated when the roller body 42 rotates between the shaft 41 and the bearing.

It is therefore an object of the present invention to provide a resin roller which is inexpensive, highly resistant to deformation by frictional heat, and highly accurate, and a method for manufacturing the same.

[0005]

In order to achieve the above-mentioned object, a resin roller according to the present invention comprises a shaft, a cylindrical resin roller main body, and a shaft welded to the roller main body together with the roller main body. A bearing member rotatable about the axis thereof, wherein the bearing member is a sliding contact inner cylinder made of polyphenylene sulfide resin in sliding contact with the shaft,
An outer cylinder portion made of the same resin as the roller body and welded to the roller body. Further, the sliding contact inner cylindrical portion has a locking portion on the outer peripheral surface thereof, and the outer cylindrical portion is injection molded so as to cover the outer peripheral surface of the sliding contact inner cylindrical portion, and is fixedly integrated by the locking portion. It was done.

Further, in order to achieve the above-mentioned object, in the method of manufacturing a resin roller according to the present invention, a polyphenylene sulfide resin is injection-molded to form a slidable inner cylindrical portion having a locking portion on the outer peripheral surface, An outer cylinder is formed by injection-molding a resin so as to cover the outer peripheral surface of the sliding contact inner cylinder, and the sliding contact inner cylinder and the outer cylinder are integrated to form a bearing member. A roller body made of resin is welded to the shaft, a shaft is inserted into the bearing member, and the roller body is assembled so as to be rotatable around the axis of the shaft.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the illustrated embodiments.

FIG. 1 is a vertical sectional view showing an embodiment of a resin roller of the present invention. The resin roller comprises a shaft 1 made of metal or the like, a cylindrical resin roller body 2 and a roller body. The bearing member 3 is welded to the roller body 2 and is rotatable around the axis C of the shaft 1 together with the roller body 2. A pair of bearing members 3 are fixed to (inside) both ends of the roller body 2. Therefore, this resin roller is configured such that both ends of the shaft 1 are supported and fixed to a fixing portion (not shown), and the roller body 2 rotates together with the bearing member 3 around the axis C of the shaft 1. Since the bearing member 3 is fixed to the roller body 2, the structure of the resin roller can be simplified.

The shaft 1 is a solid or hollow shaft member having a circular cross section and is made of, for example, aluminum (alloy) or stainless steel. The roller body 2 is a tubular member having openings at both ends, and mounting portions 7, 7 to which the outer tubular portions 5, 5 of the bearing members 3, 3 are welded are formed at both ends thereof. The material of the roller main body 2 is a resin which is inexpensive and has good workability,
In the present invention, polyphenylene ether resin (PP
E). As a result, the product can be made inexpensive without deteriorating the performance as a roller.

FIG. 2 is a vertical sectional view of the bearing member 3, and FIG. 3 is a front view thereof, and a two-dot chain line in FIG. 2 shows the roller body 2. The bearing member 3 is made of polyphenylene sulfide resin (PPS), which is in sliding contact with the shaft 1, and is made of the same resin as the roller body 2 which is welded to the roller body 2. ─
And the outer cylindrical portion 5 of.

That is, the bearing member 3 slidably contacts the shaft 1 on the sliding contact surface 4a of the sliding contact inner cylindrical portion 4, and the thickness of the sliding contact inner cylindrical portion 4 is determined by the friction heat with the shaft 1. Thus, the outer cylinder 5 made of PPE resin on the outer layer side has a thickness set so as not to be thermally deformed. This is because the heat distortion temperature of PPE resin is low at about 125 ° C, but the heat distortion temperature of PPS resin is about 260 ° C, which is excellent in heat resistance. It is composed of a thickness (volume) that does not transmit the temperature that causes deformation.

Since the PPS resin is relatively expensive, it does not become too thick, and the thickness of this portion is set (thin) so as not to impair the heat resistance of the bearing member 3 to reduce the cost. It is configured to work. Further, since the bearing member 3 (sliding contact surface 4a) is made of resin, it can smoothly slide on the metal shaft 1 as well, and can suppress the generation of abnormal noise and excessive heat generation.

The sliding inner cylinder portion 4 of the bearing member 3 has a locking portion 6 on the outer peripheral surface 4b. The outer cylindrical portion 5 is injection-molded so as to cover the outer peripheral surface 4b of the slidably contacting inner cylindrical portion 4, and is fixedly integrated by the locking portion 6. As shown in FIGS. 2 and 3, the locking portion 6 includes a first locking portion 16 that prevents mutual rotation of the sliding inner cylinder portion 4 and the outer cylinder portion 5 in the circumferential direction, and an axial direction. And a second locking portion 17 for preventing mutual disengagement.

The first engaging portion 16 is the outer peripheral surface 4 of the sliding inner cylinder portion 4.
The second locking portion 17 is a key-shaped convex portion formed on the b side.
It is a concave peripheral groove formed on the outer peripheral surface 4b side of the sliding contact inner cylindrical portion 4. Alternatively, although not shown, these convex and concave shapes may be reversed. As a result, it is not necessary to separately prepare a fixing member such as a key member or a set screw, and the sliding contact inner cylinder portion 4 and the outer cylinder portion 5 are securely processed without secondary processing such as cutting and groove formation. It can be fixedly integrated with.

The outer peripheral surface 5b of the outer cylindrical portion 5 of the bearing member 3 has a stepped cylindrical shape, and the outer cylindrical portion 5 forms a small diameter cylindrical portion 8 and a large diameter cylindrical portion 9 which are concentric in cross section. . A ring-shaped first contact surface 10 is formed on the small-diameter cylindrical portion 8 side of the large-diameter cylindrical portion 9 in the direction orthogonal to the axial center of the bearing member 3, and the small-diameter cylindrical portion 8 is formed.
A ring-shaped second contact surface 11 orthogonal to the axis of the bearing member 3 is formed on the tip surface side of the.

The mounting portion 7 of the roller body 2 is a stepped hole portion having a diameter reduced in two steps toward the center side in the longitudinal direction of the roller body 2, and a small diameter hole portion having an inner diameter larger than the inner diameter of the roller body 2. 12 and a large diameter hole portion 13 having an inner diameter larger than the inner diameter of the small diameter hole portion 12 and smaller than the outer diameter of the roller body 2. The small-diameter hole portion 12 and the large-diameter hole portion 13 are both provided in the roller body 2
Is formed so that the central axis of the
A third abutting surface 14 and a fourth abutting surface 15 are formed from the opening end side of, and these abutting surfaces 14 and 15 are ring-shaped abutting surfaces in the direction orthogonal to the axial center.

The small-diameter cylindrical portion 8 and the large-diameter cylindrical portion 9 of the bearing member 3 correspond to the small-diameter hole portion 12 and the large-diameter hole portion of the roller body 2.
The first contact surface 10 of the bearing member 3 contacts the third contact surface 14 of the roller body 2, and the second contact surface 11 of the bearing member 3
Comes into contact with the fourth contact surface 15 of the roller body 2, and the bearing member 3 is fitted into the roller body 2. Therefore, with the bearing member 3 inserted in the roller body 2, the bearing member 3 and the roller body 2
The axes of and can be easily matched.

Further, since the large diameter cylindrical portion 9 of the outer cylindrical portion 5 is thicker than the small diameter cylindrical portion 8, the first locking portion of the sliding inner cylindrical portion 4
If the 16 (convex portion) is formed so as to correspond to the large-diameter cylindrical portion 9, the first locking portion 16 can be formed without difficulty.

Next, a method of manufacturing this resin roller will be described. First, although not shown, a die is used to perform injection molding of polyphenylene sulfide (PPS) resin to form the sliding contact inner cylindrical portion 4 having the engaging portion 6 as described above on the outer peripheral surface 4b. Then, the sliding contact inner cylinder portion 4 is internally provided (inserted) at a predetermined position of another mold, and a resin is injection-molded so as to cover the outer peripheral surface 4b of the sliding contact inner cylinder portion 4 and the outer cylinder. The portion 5 is formed, and the sliding contact inner cylindrical portion 4 and the outer cylindrical portion 5 are integrated to form the bearing member 3. That is, since the outer tubular portion 5 is not compatible with the PPS resin, the outer tubular portion 5 automatically forms the inner circumferential surface along the shape of the uneven outer circumferential surface of the slidable inner tubular portion 4 and the outer circumferential surface of the outer tubular portion 5. 5
b can be formed into a predetermined stepped shape. The resin forming the outer cylinder portion 5 is the same resin as the roller body 2, and in the present invention, polyphenylene ether (PP) is used.
E) It is a resin.

Then, the resin roller body 2 is welded to the outer cylinder portion 5 of the completed bearing member 3. In the present invention, the above-mentioned first contact surface 10 of the outer cylinder portion 5 and the third contact surface 14 of the roller body 2 mounting portion 7 are welded surfaces to be welded by ultrasonic waves, and these and the vicinity thereof. It is a welded part. As a result, the strength of this joining (welding portion) is high and the roller body 2
Can rotate smoothly and stably. The material of the roller body 2 is the same as the outer cylinder portion 5 of the bearing member 3 (PPE).

This ultrasonic welding work is performed from the end surface of the roller body 2 from the direction of arrow A as shown in FIG.
Since this is done, the outer peripheral surface of the roller body 2 is not affected, and the finishing accuracy of the resin roller is not degraded. Further, although the roller body 2 of the present invention and the outer cylindrical portion 5 of the bearing member 3 are fixed by ultrasonic welding, they may be fixed by other methods. Further, a method of using a solvent may be used in addition to the welding by heat.

Then, the shaft 1 is inserted into the sliding contact inner cylindrical portion 4 of the bearing member 3 integrated with the roller body 2, and the roller body 2 is assembled so as to be rotatable around the shaft center C of the shaft 1. As a result, it is possible to reduce the number of constituent parts and further reduce the number of manufacturing steps, and manufacture a resin roller having high accuracy, durability and heat resistance.

The bearing member 3 will be further described. The bearing member 3 is a composite material of two layers of different materials (engineering plastic), and the outer cylinder portion 5 and the roller body 2 are made of materials other than the above PPE. The present invention is applicable even when the roller body 2 is made of super engineering plastic as another embodiment.

[0024]

The present invention has the following effects due to the above configuration.

Even if the roller main body 2 rotates and frictional heat is generated between the bearing member 3 and the shaft 1 (according to claim 1), the sliding contact inner cylindrical portion 4 has heat resistance, so the bearing member High accuracy can be maintained even in an environment where the temperature is high without deforming 3. Roller body 2 and outer cylinder 5
By using the same material, the roller body 2 and the bearing member 3 can be easily and firmly joined by welding such as ultrasonic waves, and if the material is inexpensive and has good workability, the manufacturing cost of the resin roller can be reduced. Can be lowered.

Even when the outer cylindrical portion 5 is formed of a different resin which is not compatible with the sliding contact inner cylindrical portion 4 made of polyphenylene sulfide resin (according to claim 2), these are simply and firmly integrated. It is possible to Also,
It requires few components and can be lightweight.

By making the roller body 2 and the outer cylinder part 5 of the same resin (according to claim 3), the roller body 2 and the bearing member 3 can be easily and firmly joined by welding of ultrasonic waves or the like. Moreover, if the material is inexpensive and has good workability, the manufacturing cost of the resin roller can be reduced. Further, even if frictional heat is generated between the bearing member 3 and the shaft 1 due to the rotation of the roller body 2, the sliding contact inner cylindrical portion 4 has heat resistance, so that the bearing member 3 is not deformed. Can be obtained. Further, even when the outer tubular portion 5 is formed of a different resin that is incompatible with the sliding contact inner tubular portion 4 made of polyphenylene sulfide resin, these can be easily and firmly integrated into one piece.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a resin roller of the present invention.

FIG. 2 is a vertical sectional view of a bearing member.

FIG. 3 is a front view of a bearing member.

FIG. 4 is a vertical sectional view of a conventional resin roller.

FIG. 5 is a vertical sectional view of a conventional resin roller.

FIG. 6 is a vertical cross-sectional view of a conventional resin roller.

[Explanation of symbols]

1 shaft 2 roller body 3 Bearing members 4 Sliding inner cylinder 4b outer peripheral surface 5 Outer cylinder 6 Locking part C axis

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J103 AA02 AA75 CA05 CA25 CA36                       DA03 FA03 FA15 FA18 HA08                       HA41                 4F206 AA34 AD05 AD25 AH04 JA07                       JB12 JF05 JL02 JN12 JN25                       JW41

Claims (3)

[Claims] 1. A shaft 1, a cylindrical roller body 2 made of resin, and a bearing member 3 welded to the roller body 2 and rotatable together with the roller body 2 around an axis C of the shaft 1.
And the bearing member 3 is in sliding contact with the shaft 1 and is made of polyphenylene sulfide resin.
And a resin outer cylinder portion 5 that is welded to the roller body 2 and is made of the same resin as the roller body 2, and a resin roller. 2. The sliding contact inner cylindrical portion 4 has a locking portion 6 on an outer peripheral surface 4b, and the outer cylindrical portion 5 includes the outer peripheral surface 4 of the sliding contact inner cylindrical portion 4.
The resin roller according to claim 1, wherein the resin roller is injection-molded so as to cover b and is fixedly integrated by the locking portion 6. 3. A polyphenylene sulfide resin is injection-molded to form a sliding contact inner cylindrical portion 4 having a locking portion 6 on the outer peripheral surface 4b, and a resin is formed to cover the outer peripheral surface 4b of the sliding contact inner cylindrical portion 4. Is formed by injection molding to form the outer cylinder portion 5, and the sliding contact inner cylinder portion 4 and the outer cylinder portion 5 are integrated to form the bearing member 3, and the outer cylinder portion 5
A resin roller manufacturing method, characterized in that a resin roller main body 2 is welded to, the shaft 1 is inserted into the bearing member 3, and the roller main body 2 is assembled so as to be rotatable around an axis C of the shaft 1.