JP2001113911A - Segment for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber segment for a vehicle mounted on an outer circumferential face of a wheel rim for constituting a vehicle such as a construction vehicle, a civil engineering vehicle or an off-road vehicle. SOLUTION: This segment for vehicle 10 comprises a rubber elastic body 14 comprising a mounting part 11 to be fixed on a rim 3, both side wall parts 12 rising from the mounting part 11, a tread part 13 straddling both side wall parts 12, a hollow part 15 piercing inside the rubber elastic body 14, and a fixing means 16 for the mounting part 11 with the rim 3. The tread part 13 protrudes outside a cross direction of both side wall parts 12, which comprises a first tread 21 having its center part treaded on a flat road and a second tread 22 positioned outside the first tread 21 to be treaded on a mountain side of a sloping road surface.

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, there is, for example, one proposed by the applicant as Japanese Patent Laid-Open No. 10-159102. As shown in a perspective view in FIG. 5, the segments are sequentially mounted in the circumferential direction on the outer peripheral surface of the rim 31 of the wheel 30, and 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 surface portion 34 that connects the side surface portions 33, 33 are provided, and these portions 32, 33, 3
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 described in claims 1 to 5 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 tread portion protruding outward in the width direction of both side walls, a center portion of the tread portion being in contact with a flat road, and a tread positioned outside of the first tread and inclined. It is characterized by comprising a second tread that contacts the ground on the mountain side of the road surface.

The side walls extend radially outward from the mounting portion, and the hollow portion is preferably formed in the longitudinal direction of the rubber elastic body. Further, the surfaces of the first tread and the second tread constituting the mounting portion each have an arc shape, and preferably, the surface of the second tread has a radius of curvature of 40 mm or more.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the tread portion has a first tread which is located at a center portion where the end portion of the tread portion projects on both side walls, that is, the outer side in the tire width direction, and which is grounded on a flat road. The second tread extends outwardly in the tire width direction from the first tread and is in contact with the mountain side of the inclined road surface, specifically, the mountain side of the inclined road surface having an inclination of about 10 degrees. The radius of curvature of the contour line of the second tread is 4
0 mm or more is preferable. This is because if the radius of curvature is less than 40 mm, a sufficient contact effect of the tread cannot be expected.

In general, when a tire is going to cross an inclined road surface such as unevenness of a rut formed on a road surface at an approach angle in a direction of climbing, as shown in FIG. 3, the tire has a reaction force FR from the road surface and an inclination. Lateral force FY due to camber thrust FC generated between the vehicle and the 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, The working lateral force FY increases. 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.

[0010] 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.

The present invention has been made based on the above findings.
The tread end has a first tread that extends in the tire width direction and contacts the ground on a flat road, and a second tread that extends outwardly in the tire width direction and contacts the ground on the mountain side of the inclined road surface. As a result, the bending deformation b · s of the tread due to the transmission of the falling deformation to the vicinity of the tread end increases, so that the camber thrust FC
Can be increased, and the tread in the vicinity of the tread end can be more widely in contact with the ground, particularly when the tread is in contact with the inclined road surface. Therefore, it is possible to ride on a sloped road smoothly.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a development view when the vehicle segment of the present invention is mounted on a rim of a wheel. The vehicle segment is mounted on the rim of the wheel in two rows in the circumferential direction, and the tread portion has a V shape as a whole. Are installed side by side. FIG. 2 is a sectional view of the vehicle segment taken along line AA shown in FIG.

In FIGS. 1 and 2, reference numeral 1 denotes a wheel (indicated by a two-dot chain line), and the wheel 1 has a disk 2 and a rim 3. The illustrated rim 3 has a cylindrical shape with a smooth outer peripheral surface. The segment 10 mounted on the wheel 1 includes a mounting portion 11 fixed to the outer peripheral surface of the rim 3, two side walls 12 extending radially outward from the mounting portion 11, and a tread portion 13 extending across the two side walls 12. A rubber elastic body 14 comprising:
It has a hollow part 15 penetrating the rubber elastic body 14 in the longitudinal direction and a fixing means 16 between the mounting part 11 and the rim 3. The hollow portion 15 in the illustrated example has a gate-shaped cross section, and includes a rubber stopper 15 a protruding from the mounting portion 11. In addition, the hollow portion 13 may have an inverted gate shape.

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.

Reference numeral 21 denotes a first tread.
Reference numeral 2 denotes a second tread, and the first tread 21 is always in contact with the traveling road surface in a normal state.
Is to contact the road surface on the mountain side when traveling on an inclined surface.

[0015]

According to the first to fifth aspects of the present invention, good ride comfort of a vehicle, excellent impact relaxation when riding over a protrusion, prevention of excessive crushing deformation of wheels, release of load. Thus, a vehicle segment capable of exhibiting excellent wandering properties while sufficiently retaining the performance of a conventional segment such as excellent vibration damping characteristics of a vehicle at the time of operation can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded view when a vehicle segment according to the present invention is mounted on a rim.

FIG. 2 is a cross-sectional view of the vehicle segment taken along the line AA shown in FIG.

[FIG. 3] FIG. 3 is an explanatory view when a general tire runs on an inclined road surface.

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

FIG. 5 is an explanatory view of a conventional vehicle segment.

[Explanation of symbols]

 1 ‥ wheel, 2 ‥ wheel, 3 ‥ rim, 10 ‥ vehicle segment, 11 ‥ mounting part, 12 ‥ side wall part, 13 ‥ tread surface part, 14 ‥ rubber elastic body, 15 ‥ hollow part, 15a ‥ stopper, 16 ‥ Fixing means, 17 ‥ metal plate, 18 ‥ fixing bolt, 21 ‥ first tread, 22 ‥ second tread.

Claims (5)

[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 segment for a wheel having a hollow portion penetrating the inside of the body and fixing means between the mounting portion and the rim, wherein the tread portion projects outwardly in the width direction of both side walls, and a central portion thereof is formed. A vehicle segment comprising: a first tread that contacts the ground on a flat road; and a second tread that is located outside the first tread and contacts the mountain side of the sloped road surface. 2. The vehicle segment according to claim 1, wherein the side wall portions extend radially outward from the mounting portion. 3. The vehicle segment according to claim 1, wherein the surfaces of the first tread and the second tread are each arcuate. 4. The vehicle segment according to claim 1, wherein the hollow portion is formed in a longitudinal direction of the rubber elastic body. 5. The surface of the second tread has a radius of curvature of 40 m.
The vehicle segment according to claim 1, wherein the length is at least m.