JPH08200352A - Composite roller - Google Patents

Abstract

PURPOSE: To provide a composite roller preventing the thermal deterioration caused by the repeated internal stress due to a high load or high-speed revolutions, capable of remarkably improving durability, and widely used for general industrial apparatuses. CONSTITUTION: This composite roller 1 has the hub 11 of a mandrel supported on an axle or a rotary shaft, and a cushioning, vibration-proof, and sound absorbing surface elastic member 13 is integrally connected along the outer periphery of the hub 11. Projections 12 are radially and intermittently formed on the outer periphery of the hub 11 which is the connecting face to the surface elastic member 13, and heat dissipating holes 15 are provided in the roller width B direction on the surface elastic member 13 at the portions entering the recesses generated between the adjacent projections 12, 12 while the number and shape are optionally set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite roller used in a rotary drive unit of general industrial equipment.

[0002]

2. Description of the Related Art Conventionally, it has been used for a wide range of equipment such as step rollers for escalators, guide rollers for elevators, wheel rollers for various carriages and play vehicles (coasters), automatic doors, casters for medical beds, and rollers for OA equipment mounts. So, as a transmission for the built-in rotary drive,
Alternatively, a composite roller, which is also called a solid roller, is used for a wheel for moving or transporting the device itself. Since all of these composite rollers are used under severe driving conditions, they are often worn out and have a short life. Most of the defects due to wear are cracks and breaks of elastic members such as rubber used for the roller surface layer and peeling of the joint with the core metal member. The reason why the roller surface layer separates from the core metal member is that repeated internal stress due to compressive stress and tensile stress acts due to high load load or high speed rotation, and the repeated elastic strain causes heat generation in the rubber roller surface layer. , Rupture due to deterioration of physical properties due to heat deterioration. 4 to 6 show an example of a conventional composite roller that copes with such peeling and breakage of the roller surface layer. FIG. 4 is a perspective view showing the composite roller 1 alone, and FIGS. FIG. 3 is a front view of a usage mode in which the compound roller 1 is rotatably supported on a rotary shaft 2 via a bearing 3 and a side sectional view taken along the line I-I.
The composite roller 1 has a hub 4 of a cored bar member which is caulked and fitted to the outer peripheral surface of the bearing 3 on the inner peripheral side thereof, and the surface elastic member 5 is integrated by injection molding or the like while covering the hub 4 from above. The surface elastic member 5 cushions, dampens, and absorbs sound. Further, the hub 4 has a large number of projections 6 radially projected from the outer periphery thereof, and by forming the projections in the shape of a gear, the projections and depressions enhance the engagement with the surface elastic member 5 which is the roller surface layer. , Strengthened against peeling.

[0003]

In the case of the composite roller 1 of the illustrated example, the hub 4 is provided with the convex portion 6 to form a gear shape, so that the surface elastic member 5 and the surface elastic member 5 are strengthened to bite each other in the circumferential direction. Relative slippage and the like are prevented, which is effective in preventing separation from the joint between the hub 4 and the surface elastic member 5. However, while the advantage is provided by providing a large number of convex portions 6, on the other hand, the internal heat generated by repeated internal stress or the like as described above bites into the valley between the convex portions 6 and the concave portion 7 of the surface elastic member 5. Will be lost to the air, and the escape heat from the accumulated heat will be lost. As a result, due to the heat of residence, the recess 7
The surface elastic member 5 in FIG. The present invention prevents thermal deterioration caused by repeated internal stress due to high load load or high speed rotation,
It is an object of the present invention to provide a composite roller that is widely used in general industrial equipment by dramatically improving durability.

[0004]

The composite roller of the present invention comprises:
A hub having a hub as a cored bar member supported by an axle or a rotating shaft, and having surface elastic members joined and integrated along the outer periphery of the hub, which is a joint surface with the surface elastic member. Radial projections are intermittently formed on the outer periphery of the surface elastic member, and heat dissipation holes are provided in the roller width direction in the surface elastic member of the portion which is embedded in the recess formed between the adjacent projections. In the composite roller of the present invention, the heat dissipation holes may penetrate from one end to the other end in the roller width direction, or may be provided as blind holes facing each other from one end to the other end and the other end to the one end in the roller width direction. The number and shape of the surface elastic members that bite into the recesses and can generate an air flow during rotational driving are arbitrarily set.

[0005]

When the roller is rotationally driven, stress is repeatedly generated on the surface elastic member due to its load and rotational speed. Depending on the degree of repeated stress, the surface elastic member elastically deforms and generates heat, and this heat easily stays in the surface elastic member in the portion that is eaten into the concave portion generated between the convex portions provided on the outer circumference of the hub. Since a heat dissipation hole is provided in the heat dissipation hole, the heat accumulated in the recess is radiated from the heat dissipation hole. As a result, the concave portion of the surface elastic member is prevented from softening, embrittlement, and deterioration due to residence heat to reduce the rigidity and physical properties, and the surface elastic member is separated from the joint portion with the hub side due to cracks or breaks. Can be prevented.
By appropriately setting the number and shape of the heat dissipation holes, an air flow is generated around the periphery of the heat dissipation holes during the roller rotation drive, and combined with the dissipation of accumulated heat, cooling of the entire composite roller composed of the hub and the surface elastic member, and eventually It is also effective in preventing heat transfer to the axles and rotating shafts including bearings.

[0006]

Embodiments of the composite roller according to the present invention will be described below with reference to the drawings. 1 to 3, FIG. 1 is a perspective view showing a single unit of a composite roller 10 of an embodiment, and FIGS. 2 and 3 show that the composite roller 10 is rotatably supported on a rotary shaft 20 via a bearing 21. 2 shows a front view of a usage pattern with the device mounted and a side sectional view taken along line II-II thereof. The compound roller 10 has a hub 11 formed in a ring shape as a core metal member on the inner peripheral side thereof.
The inner peripheral surface of the shaft is rotatably supported on the rotary shaft 20 by caulking and fitting the outer peripheral surface of the bearing 21. Hub 1
On the outer peripheral surface side of 1, the surface elastic member 13 which is covered from above is integrated by injection molding or the like, and the surface elastic member 13 serves to cushion, vibration-proof and absorb sound while the roller is driven to rotate.

In the illustrated embodiment, the hub 11 is shown to have an annular shape by setting the fitting with the bearing by the bearing 21. However, the hub 11 has a perfect disc shape without a fitting hole. A structure in which an axle such as the rotary shaft 20 is directly inserted in the center and is integrated is also possible, and it is possible to freely correspond to the form of the rotary drive unit of the device. As the material of the hub 11, various materials such as resin, wood, as well as metal such as iron, cast iron and aluminum can be used depending on the equipment and use conditions. The surface elastic member 13 that covers the outer peripheral surface of the hub 11 can be integrated by suitable means such as adhesive bonding, caulking fitting, or welding in addition to injection molding. As the material of the surface elastic member 13, a rubber-like elastic material such as urethane rubber or silicon rubber can be used, or TPU (thermoplastic polyurethane) can be injection-molded from a molten state.

Further, as shown in the conventional examples of FIGS. 4 to 6, the hub 11 has a large number of protrusions 12 from its outer periphery.
Is formed in a radial shape by protruding intermittently as if it were a gear, so that the unevenness enhances the biting of the roller surface layer with the surface elastic member 13 and strengthens against peeling. The concave portion of the hub 11 where the convex portions 12 are adjacent to each other is the concave portion 14 where the surface elastic member 13 is embedded.
Each of the recesses 14 is provided with a heat dissipation hole 15 which is the gist of the present invention.

The heat dissipation hole 15 provided on the surface elastic member 13 side is a surface elastic member 1 forming a joint with the hub 11.
As long as the rigidity and mechanical strength against peeling, breakage, etc. are not impaired as a part of 3, the number and shape of installation can be arbitrarily selected. As shown in the side sectional view of FIG.
The heat-dissipating hole 15 can be provided so as to penetrate from one end to the other end in the roller width B direction (indicated by the reference numeral 15 in the broken line in the figure), or as indicated by the solid line in the figure, 16 The blind holes 16 may be provided so as to face each other from one end to the other end in the roller width B direction and from the other end to the one end. Heat dissipation holes 15 which are through holes or blind holes
(16) is a through heat dissipation hole 1 in terms of heat dissipation function.
5 is preferable, but it is preferable that the excessive through holes do not cause a decrease in strength. In terms of strength,
It is advantageous to form blind holes 16 facing each other in both roller width directions.

The composite roller 10 having the above structure operates as follows. After the device is mounted, if the purpose of the device is to be used for a device in which a heavy object is loaded and rotatably travels on the floor or the ground, the rotary shaft 20 via the bearing 21.
During the above rotational driving, the composite roller 10 is naturally subjected to a corresponding load, and in addition, a repeated stress corresponding to the degree of rotation speed acts on the surface elastic member 13. When elastic deformation occurs due to repeated stress and the entire surface elastic member 13 generates heat,
The heat generated is the recess 1 formed at the joint with the hub 11 side.
Easy to stay in 4. The accumulated heat radiates from the heat dissipation holes 15 and escapes from the recesses 14. At this time, the centrifugal force generated by the rotational driving of the rollers is added to the heat dissipation holes 15 of the recesses 14 so that the generated heat can easily escape. An air flow due to the escape of heat is generated along the circumference of the roller, and this air flow cools not only the surface elastic member 13 but also the entire roller including the hub 11 to suppress heat generation, and the bearing 21 and the rotating shaft 20
It also has the effect of preventing heat from being transmitted to the attached equipment through the.

Therefore, by dissipating the generated heat,
In the surface elastic member 13, embrittlement due to heat deterioration and deterioration of physical properties are suppressed, and peeling from the hub 11 side can be prevented without cracking or breaking. Further, the heat dissipation hole 15 also functions as an air cushion when the internal air thereof elastically deforms the surface elastic member 13, and also helps protect the surface elastic member 13 itself and buffer the entire device.

[0012]

In the composite roller according to the present invention, a convex portion is radially formed on the outer periphery of the hub of the cored bar member, and a heat dissipation hole is provided in the roller width direction in the surface elastic member which is embedded in the convex portion. Therefore, heat generated by elastic deformation of the surface elastic member due to repetitive stress during rotational driving of the roller can be efficiently escaped from the heat dissipation hole, and cracks and fractures caused by embrittlement and deterioration due to heat may cause damage to the hub. Problems such as peeling from the joint are eliminated, and durability is dramatically improved as this type of composite roller, so the range of use is expanded to a wide variety of equipment.

[Brief description of drawings]

FIG. 1 is a perspective view of a partial cross section of a composite roller of an embodiment according to the present invention.

FIG. 2 is a front view of a composite roller of an embodiment showing a usage pattern mounted on a rotating shaft.

FIG. 3 is a side sectional view of the composite roller of the embodiment taken along the line II-II of FIG.

FIG. 4 is a perspective view with a partial cross section of a conventional composite roller.

FIG. 5 is a front view of a conventional composite roller showing a usage pattern mounted on a rotating shaft.

6 is a side sectional view of the composite roller of the embodiment taken along the line I-I of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Composite roller 11 Hub 12 Convex portion 13 Surface elastic member 14 Recessed portion of surface elastic member 15 Heat dissipation hole penetrated 16 Heat dissipation hole of blind hole

Claims (3)

[Claims] 1. A composite roller having a hub as a cored bar member supported by an axle or a rotary shaft, and having surface elastic members joined and integrated along the outer periphery of the hub, the surface elasticity being Radial convex portions are intermittently formed on the outer periphery of the hub, which is the joint surface with the member, and heat dissipation holes are provided in the roller width direction in the surface elastic member of the portion that bites into the concave portion generated between the adjacent convex portions. A composite roller. 2. The composite roller according to claim 1, wherein the heat dissipation hole penetrates from one end to the other end in the roller width direction. 3. The composite roller according to claim 1, wherein the heat-dissipating holes are blind holes provided facing each other from one end to the other end and from the other end to the one end in the roller width direction.