JP2593442Y2 - Solid roller - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid roller. More specifically, the present invention relates to a solid roller capable of exhibiting an excellent long life even under a high load.

[0002]

2. Description of the Related Art As shown in FIGS. 4 to 6, a solid roller has a rigid core 1 covered with an elastic body 2 such as a rubber-like elastic body or plastics.

[0003] Since this type of solid roller has an outer periphery coated with an elastic body, it exhibits excellent low noise performance and is widely used. For this reason, in recent years, this kind of solid roller has been used even in a place where a heavy load is applied.

However, since the elastic body 2 such as a rubber-like elastic body or a plastics has essentially inferior mechanical properties than a metal material, this kind of solid roller exhibits an excellent long life even under a high load. Is difficult.

That is, in the conventional solid roller as shown in FIGS. 4 to 6, the shear stress generated at the joint surface between the rigid core 1 and the coating material 2 during the running of the roller is, as shown in FIG. Is the largest.

[0006] On the other hand, when examining the fracture pattern of this type of solid roller, first, peeling or cracking occurs at the joint surface between the rigid core body 1 and the elastic body 2 at the roller end or in the vicinity of the elastic body 2, The delaminations and cracks then increase with the time of use, and finally the elastic body 2 breaks from the most severe delaminations or cracks.

[0007] Therefore, the life of the solid roller is a major issue whether the load applied to the roller end can be reduced.

As a conventional method for extending the life of a solid roller, the following method has been used.

(1) Improvement of strength of elastic material Rubber or plastic having high rigidity is used as the elastic material.

(2) Enlargement The width and diameter of the roller are increased to reduce the load.

(3) Deformation of elastic material coated end shape The elastic material coated end shape is deformed into an R shape as shown in FIG. 4 or FIG.

[0012]

However, as described in (1) above, in order to improve the strength of the elastic material, a solid roller coated with high-rigidity rubber or plastics increases noise during traveling. As a result, there is a disadvantage that the excellent quietness originally held is significantly impaired.

When the size is increased as in the above (2),
There is a drawback that the material cost increases, the manufacturing cost increases, and the equipment to be mounted becomes larger.

Further, as described in the above (3), the solid roller formed by deforming the end portion of the elastic material into an R shape has a drawback that the effect of improving the service life under a high load is not so large.

The present invention has been made in view of such a point, and aims at solving the above-mentioned disadvantages of the prior art, and has the same outer diameter, the same width and the same elastic material as those of the prior art. Regardless, it is an object of the present invention to provide a solid roller capable of exhibiting a remarkably long life under a high load.

[0016]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a solid roller comprising a rigid core covered with a single layer of an elastic material, wherein the rigid core has a center outer diameter φD and an end portion.
Difference (D−d) from outer diameter φd is 5 to 30 mm, end length X
Is a solid rigid core of 2 to 30 mm .

In the present invention, a steel core is used as the rigid core.
Rigid metal core such as body, brass core, aluminum core
Is used.

As the plastic rigid core, there are a phenol resin core, a glass fiber reinforced unsaturated polyester resin core, a polyamide resin core, a polyether resin core and the like.

In the present invention, as the elastic body, polyurethane rubber, chloroprene rubber, ethylene propylene diene rubber, styrene butadiene rubber, natural rubber, polyurethane resin, polyamide resin and the like are used.

In the present invention, the outer diameter φD at the center of the rigid core body
And the end diameter φd, that is, the value of (D−d) is 5 to 3
0, more preferably 10 to 20 mm is appropriate. This is because the effect of reducing the shearing stress is small when the size is 5 mm or less and the dimensional difference is small, and the effect of reducing the shearing stress in proportion to the increase in the size cannot be expected when the size is 30 mm or more.

In the present invention, the end length X of the rigid core body
Is suitably 2 to 30 mm, more preferably 3 to 15 mm. This is because the effect of alleviating the shear stress is small when it is 2 mm or less, and the effect of alleviating the shear stress cannot be expected when it is 30 mm or more in proportion to the increase in size.

In the present invention, the chamfer R of the chamfer at the boundary between the center and the end of the rigid core is 0.5 to 10 m.
m, more preferably 1 to 7 mm. This is because the effect of reducing the shear stress is small when the chamfer R is small at 0.5 mm or less, and the effect of reducing the shear stress cannot be expected at 10 mm or more in proportion to the size increase.

[0023]

[Function] A layer of elastic material is coated on the rigid core of the present invention.
Solid roller consists of a central outer diameter φD and an end outer diameter φ
The difference (D-d) from d is 5 to 30 mm, and the end length X is 2 to
By using a 30 mm metal rigid core, the shear stress generated at the joint surface between the metal rigid core and the elastic body at the end of the solid roller during running of the roller is alleviated so as to be evenly received on the entire joint surface. As a result, the life of the solid roller is improved.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a solid roller according to the present invention and a conventional comparative example will be described with reference to the drawings.

Example 1 The outer diameter at the center of the rigid core φD = 67 mm, the width at the center of the rigid core 1 = 14 mm, the overall width L = 40 mm, the outer diameter at the end of the rigid core φd = 50 mm, the rigid core 16. Prepare a mild steel core of R = 4 mm at the chamfered portion at the boundary between the center and the end of the body, apply an adhesive on this mild steel core, and then apply polyurethane rubber to a thickness φD based on 16. It was coated so as to have a diameter of 5 mm and a φd standard of 25 mm, and was vulcanized under predetermined conditions.

The polyurethane rubber hardness of the obtained solid roller is 90 in JIS-A hardness.

FIG. 1 is an explanatory sectional view showing Embodiment 1 of the solid roller of the present invention thus obtained, wherein 1 is a mild steel core and 2 is polyurethane rubber.

Embodiments 2 and 3 shown below have the same shape and different dimensions.

[Example 2] The outer diameter φD of the central portion of the rigid core was 67 mm, the width l of the central portion of the rigid core was 14 mm, the overall width L was 40 mm, the outer diameter φd of the end of the rigid core was 62 mm, and the rigid core was 16. Prepare a mild steel core of R = 4 mm at the chamfered portion at the boundary between the center and the end of the body, apply an adhesive on this mild steel core, and then apply polyurethane rubber to a thickness φD based on 16. It was coated so as to be 5 mm and φd standard 19 mm, and was vulcanized under predetermined conditions.

The polyurethane rubber hardness of the obtained solid roller is 90 in JIS-A hardness.

Example 3 Rigid core outer diameter φD = 67 mm, center width l = 14 mm, full width L = 40 mm, rigid core outer diameter φd = 62 mm, rigid core A chamfered portion at the boundary between the center portion and the end portion of the body was prepared with a mild steel core of R = 4 mm, an adhesive was applied on the mild steel core, and then a polyurethane rubber having a thickness of φD was used. 5mm, φ d standard 31.5mm
And vulcanized under predetermined conditions.

The polyurethane rubber hardness of the obtained solid roller is 90 in JIS-A hardness.

[Example 4] Made of mild steel having a center outer diameter φD of the rigid core of 67 mm, a center width l of the rigid core of l = 14 mm, an overall width L of 40 mm, and an end outer diameter of the rigid core of φd = 50 mm. A core was prepared, an adhesive was applied on this mild steel core, and a polyurethane rubber was coated so as to have a thickness of φ16.5 mm and a thickness of φ25 mm, and was vulcanized under predetermined conditions.

The polyurethane rubber hardness of the obtained solid roller is 90 in JIS-A hardness.

FIG. 2 is an explanatory sectional view showing Embodiment 4 of the solid roller of the present invention thus obtained, wherein 1 is a mild steel core and 2 is polyurethane rubber.

[Example 5] Made of mild steel having a center outer diameter φD of the rigid core of 67 mm, a center width l of the rigid core of l = 30 mm, an overall width L of 40 mm, and an end outer diameter of the rigid core of φd = 50 mm. A core was prepared, an adhesive was applied on this mild steel core, and a polyurethane rubber was coated so as to have a thickness of φ16.5 mm and a thickness of φ25 mm, and was vulcanized under predetermined conditions.

The polyurethane rubber hardness of the obtained solid roller is 90 according to JIS-A hardness.

FIG. 3 is a cross-sectional view showing Embodiment 5 of the solid roller of the present invention thus obtained, wherein 1 is a mild steel core and 2 is polyurethane rubber.

COMPARATIVE EXAMPLE 1 A mild steel core having an outer diameter φD = 67 mm, a chamfered end R = 4 mm, and a total width L = 40 mm was prepared, and an adhesive was applied onto the mild steel core. The thickness of the polyurethane rubber is 16.
The coating was applied to a thickness of 5 mm and vulcanized under predetermined conditions.

The obtained solid roller has a polyurethane rubber hardness of JIS-A hardness of 90.

FIG. 4 is a sectional explanatory view showing the solid roller of Comparative Example 1 thus obtained, wherein 1 is a mild steel core and 2 is polyurethane rubber.

Comparative Example 2 A mild steel core having an outer diameter φD = 67 mm and a total width L = 40 mm was prepared, and an adhesive was applied onto the mild steel core. To cover,
The vulcanization was performed under predetermined conditions. Further, the rubber end was chamfered at R = 2 mm.

The polyurethane rubber hardness of the obtained solid roller is 90 according to JIS-A hardness.

FIG. 5 is an explanatory sectional view showing the solid roller of Comparative Example 2 thus obtained, wherein 1 is a mild steel core and 2 is polyurethane rubber.

Comparative Example 3 A mild steel core having an outer diameter φD = 67 mm and a total width L = 40 mm was prepared, and an adhesive was applied to the mild steel core. To cover,
The vulcanization was performed under predetermined conditions.

The polyurethane rubber hardness of the obtained solid roller is 90 in JIS-A hardness.

FIG. 6 is a sectional explanatory view showing the solid roller of Comparative Example 2 thus obtained, wherein 1 is a mild steel core and 2 is polyurethane rubber.

Next, the solid rollers of Examples 1 to 3 and the solid rollers of Comparative Examples 1 to 3 thus obtained were subjected to a model weighted running test.

FIG. 8 is an explanatory front view showing a model weighted traveling test apparatus.

In FIG. 8, 3 is a running wheel having an outer diameter of φ760 mm, 4 is a solid roller sample used for the test,
5 is an arm and 6 is a weight.

This model-weighted running test apparatus sets the solid roller sample 4 and then moves the running wheel by 30 m.
/ Min, and the time at which the elastic layer cracks and the time at which the arm 5 starts swinging by 3 mm or more due to the cracking and peeling of the rubber elastic layer was measured as the breaking time of the elastic layer.

FIG. 9 shows the results of the model weighted running test.

As can be seen from FIG. 9, the solid roller of Comparative Example 1 cracked in the elastic layer in 480 hours,
It broke at 0 hours. The solid roller of Comparative Example 2 cracked in the elastic layer in 390 hours and broke in 610 hours. The solid roller of Comparative Example 3 was 440.
Cracks occurred in the elastic layer over time, and fractured in 540 hours.

On the other hand, the solid rollers of Examples 1 to 3 were not cracked nor broken at the stage of the test for 950 hours, and the test was further continued.

FIG. 9 does not show the results of the model weighted running test for Examples 4, 5, and 6, but the test was conducted for 950 hours in the same manner as the solid rollers of Examples 1 to 3. There are no cracks or fractures and the test is ongoing.

[0056]

[Effect of the Invention] The solid roller of the present invention is capable of exhibiting a remarkably long life under a high load despite being made of the same outer diameter, the same width and the same elastic material as the conventional one, and is industrially useful. is there.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view showing a first embodiment of a solid roller of the present invention.

FIG. 2 is an explanatory cross-sectional view showing Embodiment 4 of the solid roller of the present invention.

FIG. 3 is an explanatory sectional view showing Embodiment 6 of the solid roller of the present invention.

FIG. 4 is an explanatory sectional view showing a conventional solid roller of Comparative Example 1.

FIG. 5 is an explanatory sectional view showing a conventional solid roller of Comparative Example 2.

FIG. 6 is an explanatory sectional view showing a conventional solid roller of Comparative Example 3.

FIG. 7 is a graph showing a distribution of shear stress applied to a bonding interface between a rigid core body and an elastic body of a solid roller.

FIG. 8 is an explanatory front view showing a model weighted traveling test device.

FIG. 9 is a graph showing the results of a model weighted running test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rigid core body 2 Elastic body 3 Running wheel 4 Solid roller sample used for test 5 Arm 6 Weight 7 Prop

──────────────────────────────────────────────────続 き Continuing from the front page (72) Minoru Kaneda 3-1-1 Sukekawa-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Rubber Processing Co., Ltd. (56) References Kaihei 3-12613 (JP, U) Japanese Utility Model Showa 62-103521 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16C 13/00 B60B 33/00 B65G 39/00

Claims (3)

(57) [Scope of request for utility model registration] 1. A solid roller comprising a rigid core covered with a layer of an elastic body, wherein the rigid core has a central outer diameter.
The difference (D-d) between φD and the end outer diameter φd is 5 to 30 mm,
A solid roller having a metal rigid core having an end length X of 2 to 30 mm . 2. The solid roller according to claim 1, wherein the chamfer R of the chamfer at the boundary between the center and the end of the rigid core body is 0.5 to 10 mm. 3. The rigid core body has a center outer diameter φD and an end outer diameter φd.
(D-d) is 5 to 30 mm, and the end length X is 2 to 3
2. The solid roller according to claim 1, wherein a chamfer R of a chamfered portion at a boundary between a center portion and an end portion of the rigid core is 0.5 to 10 mm.