JP2001121914A - Segment for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber segment for a construction vehicle, a civil work vehicle or an off-road vehicle, mounted on the outer periphery of a vehicle rim for constituting a vehicle. SOLUTION: A segment for vehicle comprises a rubber elastic body having a mounting part fixed to the outer periphery of a vehicle rim, both side wall parts rising from the mounting part to the outside, and a tread part extending over between both side wall parts, a first hollow portion passing through the rubber elastic body, and a fixing means located between the mounting part and the rim, wherein a second hollow portion is provided on the side wall part outside the rim in the state of mounting the segment for vehicle on the rim to form ridge parts on the first hollow portion and the second hollow portion, ranging from the mounting part or the treat part into each hollow portion, with its peak being spaced smaller from a plane opposed to the peak of the mounting part or the tread part than spaced corresponding to the second hollow portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber vehicle segment which is mounted on an outer peripheral surface of a wheel rim to constitute a vehicle in a vehicle such as a construction vehicle, a civil engineering vehicle, and an off-road vehicle.

[0002]

2. Description of the Related Art As a vehicle segment of this type, for example, there is one proposed by the present applicant as Japanese Patent Application Laid-Open No. 10-159102. As shown in a perspective view in FIG. 4, the segments are sequentially mounted in the circumferential direction on the outer peripheral surface of the rim 31 of the wheel 30. A mounting portion 32 fixed to the rim 31 and a mounting portion 32 of the mounting portion 32 A side surface portion 33 that rises to the left and right in the rim width direction and a tread portion 34 connecting the side surface portions 33, 33 are provided.
4 form a hollow portion 35, and a bolt 36 to be mounted on the rim 31 is provided via a reinforcing plate 37 embedded in the mounting portion 32, and a protruding portion projecting from the mounting portion 32 into the hollow portion 35. 38 are provided. In the drawing, reference numeral 39 denotes a supporter that protrudes from the reinforcing plate 37 and reinforces the raised portion 38.

[0003] In a wheel to which the segment having such a configuration is applied, the vertical spring constant of the running vehicle is softened under the action of the hollow portion 35 extending in the circumferential direction of the rim 31, so that the ride comfort of the vehicle is improved. In addition to the above, it is possible to reduce the impact when the vehicle goes over the protrusion, and when the load is applied during loading and unloading of the vehicle, the inner surface of the tread portion 34 comes into contact with the peripheral surface of the raised portion 38 so that the wheel In the meantime, when the load is released, vibration generated in the vehicle can be effectively attenuated based on energy absorption due to friction between the inner surface of the hollow portion 35 and the peripheral surface of the raised portion 38. it can.

[0004]

However, while a wheel having such a segment has a prominent effect as described above, a vehicle equipped with the wheel is particularly suitable for high-speed running on a general road surface or a work site. It has been found that when traveling from a track running on a hard road to a normal road, a phenomenon occurs in which the vehicle swings left and right regardless of the intention of the vehicle operator. This phenomenon is generally called wandering and not only imposes extra fatigue on the operator, but also sometimes causes danger such as an accident. Accordingly, an object of the present invention is to provide a wheel segment having improved wandering resistance while maintaining the above advantages.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the present invention is to provide a mounting portion fixed to the outer peripheral surface of a rim of a wheel, and an outer portion from the mounting portion. A wheel having a rubber elastic body including a rising side wall portion and a tread portion extending between both side wall portions, a hollow portion penetrating the rubber elastic body, and fixing means between the mounting portion and the rim. A second hollow portion provided in the side wall portion outside the rim when the vehicle segment is mounted on a rim, and a mounting portion is provided in each of the first hollow portion and the second hollow portion. Alternatively, a protruding portion protruding from the tread portion into each of the hollow portions is provided, and a gap between a top surface of the protruding portion and a surface of the mounting portion or the tread portion facing the top surface corresponds to the second hollow portion. The vehicle segment has a larger interval.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Generally, when a tire is going to cross an inclined road surface such as an uneven surface of a rut formed on a road surface at an approach angle, as shown in FIG. Lateral force FY due to camber thrust FC generated between force FR and the inclined road surface acts. Here, if the tire is, for example, a radial tire, the radial stiffness and the width stiffness of the tire are higher than those of a conventional bias tire, so the reaction force FR is large and the camber thrust FC is small, Working lateral force FY
Becomes larger. That is, it has been found that a wandering phenomenon occurs because the approach angle must be increased in order to ride on an inclined road surface, and a smooth ride cannot be performed. Therefore, in order to suppress the wandering phenomenon, it is effective to decrease the lateral force FY by increasing the camber thrust FC. Then, the inventor further examined this point and obtained the following knowledge.

[0007] This can be further described for the vehicle segment, as shown in FIG.
The falling deformation of the side wall 7 that occurs when the tire touches the inclined road surface and bends causes tread bending deformation b · s near the tread edge, and the tread shear deformation S · s caused by this deformation causes The contribution of the generated lateral force F · s in the direction of riding on the inclined road surface is large. Therefore, in order to increase the camber thrust FC, the bending deformation b · s of the tread by transmitting the falling deformation to the vicinity of the tread end may be increased. Also, the tread surface near the tread edge should be more widely contacted with the ground especially when it comes into contact with the sloped road surface.

[0008] The present invention based on the above findings,
The direction in which the edge of the segment tread outside the rim comes into wide contact with the slope of the rut, and the sloping surface generated by the shear deformation of the tread portion due to the falling deformation transmitted to the vicinity of the tread edge due to the falling deformation of the side wall of the segment. Of the camber thrust F
C will increase. Furthermore, since the side wall portion of the segment outside the vehicle easily falls down toward the inside of the vehicle, bending of the side wall portion in this direction causes bending deformation near the end of the tread portion, and shearing of the tread portion due to the deformation occurs. The lateral force generated by the deformation in the direction of riding on the inclined tread is increased, and this increases the camber thrust FC, which leads to an improvement in the straight running stability on the rut.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cut-away side view when the vehicle segment of the present invention is mounted on a rim. In FIG. 1, reference numeral 30 denotes a wheel, and the wheel 30 includes a rim 31. This wheel 30
The segment 10 to be mounted on the rim 31 includes a mounting portion 11 fixed to the outer peripheral surface of the rim 31, two side walls 12 extending radially outward from the mounting portion 11, and a tread portion 13 extending across the two side walls 12. The elastic body 14 and the rubber elastic body 1
4, hollow portions 15a and 15b penetrating in the longitudinal direction,
15c and fixing means 16 between the mounting portion 11 and the rim 31
Having.

Each of the hollow portions 15 in the illustrated example is provided with a rubber stopper 15 s protruding from the mounting portion 11.
Are arranged in two rows on the outer surface. Hollow parts 15a, 15
Reference numerals b and 15c denote hollow portions that are sequentially larger than the inner side.
a, 13b, 13c are formed, and the tread portions 13d, 13e corresponding to the outside of the rim 31
This is an example having a shape that recedes toward the plate 17 in accordance with the bending of the wheel 7 and has a function of touching the ground when the wheel runs on an inclined surface.

The shape of the peripheral grooves 13a and 13b is a groove having a depth cut to the outside, and the inner groove edge is preferably formed of a curved surface. In addition, as can be seen from the surface development view, the circumferential length of the tread portion 13 becomes shorter toward the center of the rim.

The fixing means 16 has a radius substantially concentric with the radius of the outer peripheral surface of the rim 3, and is provided with a rotation axis (not shown) of the wheel 1.
Metal plate 17 and fixing bolt 18 extending in parallel with
The plate 17 and the fixing bolt 18 are embedded in the mounting portion 11. Plate 1 as shown
Both the case where the whole 7 is buried and the case where the inner peripheral surface of the plate 17 is exposed are acceptable. In the figure, the plate 17 and the rim 31 are examples in which the outer portion is bent, but it is needless to say that the plate 17 and the rim 31 may be formed in a straight shape.

When the wheel comes into contact with the inclined surface and rides on it, the raised portion 15s of the hollow portion 15c on the side contacting the inclined surface.
The inner surface interval t0 of the tread portions 13d and 13e corresponding to the above is configured to be larger than t in the hollow portion 15b located on the center side thereof, and the outer tread portions 13d and 13eno of the segment are crushed by that much. However, the area in contact with the inclined surface is increased accordingly, making it easier to get over ruts and the like.

In particular, in the segment shown in the figure, the tread portion outside the rim is relatively soft, and the tread portion outside the central portion of the rim contacts the inclined surface with a wider area. As a result, the ability to ride on the inclined surface is greatly effective. Furthermore, the increase in the interval W between the tread portions in the center portion ensures that the road surface is caught during traveling, so that the traction effect is further increased.

[0015]

According to the present invention, good ride comfort of a vehicle, excellent shock relaxation when riding over a protrusion, prevention of excessive crushing deformation of wheels, excellent vibration damping characteristics of a vehicle when a load is released, etc. Thus, a vehicle segment capable of exhibiting excellent wandering properties while sufficiently retaining the performance of a conventional segment can be provided.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a vehicle segment according to the present invention.

FIG. 2 is an explanatory diagram when a general tire runs on an inclined road surface.

FIG. 3 is an explanatory view similar to FIG. 4 in a vehicle segment.

FIG. 4 is an explanatory view of a conventional vehicle segment.

[Explanation of symbols]

 30 ‥ wheel, 31 ‥ rim, 10 ‥ vehicle segment, 11 ‥ mounting part, 12 ‥ side wall part, 13 ‥ tread surface part, 14 体 rubber elastic body, 15 ‥ hollow part, 15s ‥ raised part, 16 ‥ fixing means, 17 ‥ metal plate, 18 ‥ fixing bolt, t, t0 ‥ spacing between ridge and tread.

Claims (1)

[Claims] 1. A rubber elastic body comprising: a mounting portion fixed to an outer peripheral surface of a rim of a wheel; two side walls rising outward from the mounting portion; a tread portion extending between the two side walls; A wheel segment having a hollow portion penetrating the inside of the body and fixing means between the mounting portion and the rim, wherein the vehicle segment is attached to the rim, and the side wall portion outside the rim is attached to the wheel segment. A second hollow portion is provided, and each of the first hollow portion and the second hollow portion is provided with a raised portion projecting from the mounting portion or the tread portion into each of the hollow portions, and a top surface of the raised portion and the mounting portion or A vehicle segment, wherein a distance between a surface of the tread portion and the surface facing the top surface is larger at a distance corresponding to the second hollow portion.