JPH06127202A - Wheel - Google Patents

Abstract

PURPOSE:To eliminate necessity of spraying particles for increasing sticking on road surface by providing, in parallel with a wheel shaft, multiple rings between a cylindrical outer wheel of which outer side forms a tread and a wheel to increase the frictional force between the tread and the road surface. CONSTITUTION:A ceramic coating which is large in frictional coefficient and resistant in radio activity and heat resistance is applied, in as-spray condition, onto a tread 11 of an outer wheel 1. Also the outer wheel 1 is formed cylindrically by increasing the radius of curvature of a crowning on the tread 11 as large as possible so that the contact surface of the tread 11 of the outer wheel 1 with road surface is increased. In addition, because a steel wheel is not elastic, multiple rings 3 which are low in spring rigidity are welded in radial direction between the cylindrical outer wheel 1 and a wheel 2 which forms a connection with the wheel and is provided with an inner wheel 22 so that uneven contact of the tread 11 with road surface can be avoided.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a nuclear facility, a steel mill,
The present invention relates to wheels applied to other vehicles such as transportation vehicles.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view of a conventional wheel used for a vehicle for transportation in a nuclear facility. In the figure, an iron wheel 01 is used as a vehicle wheel for transportation in an environment where rubber tires cannot be used due to irradiation of radiation or high temperature or extremely low temperature. Since such a wheel 01 made of iron has a small friction coefficient on the tread surface, when the road surface is inclined or oil, water or the like is attached to the road surface, the friction coefficient may further decrease and slip may occur. In order to avoid this slip, measures are taken such as spraying particles for increased adhesion on the road surface. Further, since the iron wheel 01 does not have elasticity like rubber tires and is hard to be deformed,
A crowning having a curvature R is provided on the tread so as to alleviate the uneven contact of the tread.

[0003]

In the conventional wheel as described above, since the particles for increasing the adhesion are scattered on the road surface,
It takes time and labor to consume the particles for increasing the adhesion, to spray the particles for increasing the adhesion, and to clean the scattered particles.

[0004]

SUMMARY OF THE INVENTION A wheel according to the present invention is intended to solve the above-mentioned problems, and a cylindrical outer ring having a tread surface on the outer side, and an outer ring interposed between the outer ring and the wheel in parallel with the wheel shaft. And a plurality of formed rings.

[0005]

That is, in the wheel according to the present invention, a plurality of rings are interposed parallel to the wheel shaft between the outer ring having a tread surface on the outer side and the wheel, and the outer ring is formed in a cylindrical shape. The ground contact area of the tread with respect to the road surface increases and the outer ring has elasticity due to the ring, so that the frictional force between the tread surface and the road surface increases.

[0006]

1 and 2 are explanatory views of a wheel according to an embodiment of the present invention. In the figure, the wheel according to the present embodiment is used for a transportation vehicle or the like in a nuclear facility, and is made of iron because it is used in an environment where a rubber tire cannot be used due to irradiation of radiation or high temperature or extremely low temperature. Since such an iron wheel has a small friction coefficient on the tread surface, in this wheel, as shown in FIG. 1, the tread surface 11 of the outer ring 1 remains coated with a ceramic coating having a large friction coefficient and excellent radiation resistance and heat resistance. It is applied in the as-spray state. Also, the tread 1 of the outer ring 1
The outer ring 1 is formed into a cylindrical shape by increasing the curvature R of the crowning on the tread 11 as infinitely as possible so that the contact area with the road surface at 1 is increased. Further, since the iron wheel is not elastic, between the outer ring 1 having a cylindrical shape and the wheel 2 having the inner ring 22 which is connected to the axle so as to avoid uneven contact with the road surface on the tread 11. A plurality of rings 3 having low spring rigidity are provided in the radial direction by welding.

That is, reference numeral 1 in FIG. 1 is SUS304.
The outer ring 1 is made of steel, and the tread surface 11 is applied in the as-spray state with the ceramic spray coating as it is, and the crowning of the tread surface 11 has a curvature ∞ and the outer ring 1 is cylindrical. Reference numeral 2 denotes a wheel made of SUS304 steel, which is composed of a flange portion 21 connected to an axle (not shown), an inner ring 22, and the like. A plurality of SUS304 steel rings 3 are arranged at equal intervals between the inner ring 22 of the wheel 2 and the outer ring 1 in parallel with the axle, and the tread 11 of the outer ring 1 is compliant (elastic and stretchable). To have. The joints of the rings 3 are joined by welding, but the welding of the rings 3 is not the plug welding 41, 42 for joining the inner ring 22 and the ring 3 of the ultra-thin plate and the outer ring 1 and the ring 3 respectively. When plug welding is performed, holes (plugs) 40 are bored at regular intervals in the outer ring 1 and the inner ring 22, and the outer ring 1 and the steel ring 3 and the inner ring 22 and the steel ring 3 are connected to each other. Welding is performed through the hole 40 using the same SUS304 steel material as the ring 3. Outer ring 1
Has an inner diameter D _o of 103 _mm and a wall thickness t _o of 2 _mm . Also,
The thickness of the coating C _r2 O _{3 formed} by ceramic spraying is 0.1 _mm in consideration of wear life and adhesive strength. The outer diameter D _i of the inner ring 2 is 67 _mm . The outer diameter d, the length l, and the wall thickness t of the ring 3 are d = 16 _mm and l = 40, respectively.
_mm , t = 0.5 _mm .

When ceramic thermal spraying is applied in this way,
About this wheel with compliant property SUS
A rolling test was performed using a 304 steel roller. So
The test results of (1) are shown in FIG. 2 in comparison with those of a conventional iron wheel.
The vertical axis is the friction coefficient μ at which the wheels start to slip._cr,
The horizontal axis is the load W applied to the wheels. Also, T ₁
If the conventional wheels are still ceramic sprayed,
₂Shows the case where the ceramic sprayed is polished.
As is clear from this result, the friction characteristics of this wheel are
Significantly improved compared to conventional iron wheels. example
For example, if the load W is 100 kgf, the wheels will slip.
Generated friction coefficient μ_crIs μ for conventional iron wheels
_cr= 0.25 but ceramics with high friction properties
After ceramic spraying, this ceramic spray was polished to finish
Case T₂Then μ_cr To 0.45. Also this
In the case of as-spray condition with ceramic sprayed T
₁Is the projection of the ceramic material sprayed on the SUS
The so-called spike effect that penetrates into the surface of 304 steel roller
As a result, it rises slightly and μ_cr= 0.5. Furthermore
In addition, this car has a compliant property on the tread of the outer ring
In the case of a ring, the contact area with the roller increases and μ_cr=
It has risen to 0.65.

As described above, in the present wheel, the outer ring 1 has a cylindrical shape and a plurality of rings 3 are provided between the outer ring 1 and the inner ring 22 to increase the ground contact area of the tread 11 of the outer ring 1 to the road surface. In addition, the coefficient of friction on the tread surface 11 of the outer ring 1 is increased by applying the ceramic coating. As a result, the frictional force between the tread surface 11 and the road surface of the wheel is increased, and even if the road surface is inclined or oil or water is attached, the wheel can be reliably driven without slipping. Since the conventional iron wheel has a low friction coefficient, for example, when the load W is 100 kgf, the limit inclination angle θ _C at which the vehicle can climb is tan ^-1 μ _cr = 14 °.
However, at an inclination angle having a larger angle than this, it is necessary to spray particles for increasing the adhesion, but in this wheel, the tread surface 11 of the outer ring 1 is ceramic-sprayed and the tread surface 11 is compliant. Therefore, the limit inclination angle θ _C that allows climbing is tan
Increased to ^-1 μ _cr = 33 ° enables stable operation over a wide range of inclination angles, thus eliminating the need for particle spreading for increased adhesion, which is the case with conventional iron wheels. Further, this wheel is also useful for general vehicles used in normal atmosphere such as railways, and particularly when the rail has an inclination and a high friction force is required, stable running characteristics without slipping can be obtained. can get.

[0010]

Since the wheel according to the present invention is constructed as described above and the frictional force between the tread surface and the road surface is increased, it is not necessary to spray the particles for increasing the adhesion on the road surface.

[Brief description of drawings]

FIG. 1 (a) is a front view of a wheel according to an embodiment of the present invention, and FIG. 1 (b) is a sectional view taken along line bb in FIG. 1 (a).

FIG. 2 is an explanatory diagram of its operation.

FIG. 3 is a cross-sectional view of a conventional wheel.

[Explanation of symbols]

 1 outer ring 2 inner ring 3 ring 11 tread 40 hole 41 plug welding 42 plug welding

Claims (1)

[Claims] 1. A wheel comprising a cylindrical outer ring having a tread surface on the outside, and a plurality of rings interposed between the outer ring and the wheel in parallel with the wheel shaft.