Solid tire for industrial vehicle and industrial vehicle

Abstract

To provide a solid tire for an industrial vehicle and an industrial vehicle that allow a state of a tire to be monitored during vehicle traveling.SOLUTION: Provided is a solid tire 1 for an industrial vehicle. The solid tire 1 for an industrial vehicle includes: a plurality of rubber layers 2 overlapped in a tire radial direction; and at least one electronic device 6. The plurality of rubber layers 2 includes a base rubber layer 5 having a sheet abutting surface 5a capable of abutting on a sheet part 4a of a rim 4. The electronic device 6 is arranged in the rubber layer 2 excluding the base rubber layer 5, out of the plurality of rubber layers 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a solid tire for an industrial vehicle and an industrial vehicle equipped with the solid tire for an industrial vehicle. [Background technology]

[0002] Conventionally, solid tires for industrial vehicles that are preferably mounted on industrial vehicles such as forklifts have been known. For example, the following Patent Document 1 proposes a pneumatic cushion tire for industrial vehicles that has improved tire life by specifying the rubber component of the rubber composition that constitutes the tread. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-026251 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, even in the case of solid tires for industrial vehicles as disclosed in Patent Document 1, there has been a demand for monitoring the condition of the tires while the vehicle is traveling, similar to the case of pneumatic tires.

[0005] The present invention has been devised in view of the above circumstances, and has as its main object to provide a solid tire for an industrial vehicle, and an industrial vehicle, which are capable of monitoring the condition of the tire while the vehicle is traveling. [Means for solving the problem]

[0006] The present invention is a solid tire for industrial vehicles, comprising a plurality of rubber layers stacked in the radial direction of the tire and at least one electronic device, wherein the plurality of rubber layers includes a base rubber layer having a seat abutment surface capable of abutting against a seat portion of a rim, and the electronic device is disposed in a rubber layer of the plurality of rubber layers other than the base rubber layer. Effect of the Invention

[0007] The solid tire for industrial vehicles of the present invention has the above-mentioned configuration, and thus makes it possible to monitor the condition of the tire while the vehicle is running. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing one embodiment of a solid tire for an industrial vehicle according to the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing a temperature distribution in a solid tire for an industrial vehicle during running. [Diagram 3] FIG. 4 is a cross-sectional view of a solid tire for industrial vehicles according to a second embodiment. [Figure 4] FIG. 11 is a cross-sectional view of a solid tire for industrial vehicles according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a tire meridian cross-sectional view including a rotation axis showing an industrial vehicle solid tire 1 of this embodiment. As shown in Fig. 1, the industrial vehicle solid tire 1 of this embodiment is a tire mounted on at least one of the driving wheels and steering wheels of an industrial vehicle (not shown) such as a forklift. An industrial vehicle such as a forklift is preferably used, for example, with the front wheels as driving wheels and the rear wheels as steering wheels.

[0010] The solid tire 1 for industrial vehicles of this embodiment includes a plurality of rubber layers 2 stacked in the tire radial direction. The plurality of rubber layers 2 preferably include a tread rubber layer 3 having a ground contact surface 3a, and a base rubber layer 5 having a seat contact surface 5a that can contact the seat portion 4a of the rim 4. Each of the plurality of rubber layers 2 can be composed of a rubber composition according to the function required for the ground contact surface 3a and the seat contact surface 5a.

[0011] Fig. 2 is a schematic diagram showing an example of temperature distribution during running of an industrial vehicle solid tire 1. As shown in Fig. 2, the industrial vehicle solid tire 1 has a tendency to generate heat partially during running, for example. Heat generation as shown in Fig. 2 tends to occur more significantly in the rear wheels, which are the steering wheels, because industrial vehicles such as forklifts are heavy and have a large steering angle.

[0012] One of the reasons for increased heat generation in the rear wheels is, for example, the large lateral force generated when turning with a large steering angle. Such heat generation can cause heat separation when the rubber layer 2 other than the base rubber layer 5 has a high temperature portion Hp that is the hottest among the multiple rubber layers 2 and is used under harsh conditions such as high-load work or long-term continuous driving.

[0013] 1, the industrial vehicle solid tire 1 of this embodiment includes at least one electronic device 6. The electronic device 6 of this embodiment is disposed in one of the multiple rubber layers 2 other than the base rubber layer 5.

[0014] Such electronic device 6 can monitor the condition of the tire near the high temperature part Hp, which is the most severe condition. Therefore, the industrial vehicle solid tire 1 of this embodiment can monitor the tire condition while the vehicle is running, and can improve durability when used under severe conditions.

[0015] In a more preferred embodiment, the electronic device 6 is capable of measuring the internal temperature of the tire. The measured internal temperature of the tire is displayed, for example, in a position visible to the driver of an industrial vehicle equipped with the industrial vehicle solid tire 1. The internal temperature of the tire is not limited to being displayed in this manner, and may be notified by an alarm or the like when a preset temperature is reached, or may be displayed so as to be recognizable by a management center or the like.

[0016] Such electronic device 6 can directly monitor the internal temperature of the tire while the vehicle is running. However, the electronic device 6 is not limited to such an embodiment, and may measure, for example, the force or vibration acting on the tire, or the running distance or continuous running time.

[0017] The multiple rubber layers 2 in this embodiment are composed of a tread rubber layer 3 and a base rubber layer 5. For this reason, the electronic device 6 in this embodiment is disposed in the tread rubber layer 3. Such an electronic device 6 is suitable for monitoring the state of the tread rubber layer 3.

[0018] The distance L in the tire radial direction from the seat contact surface 5a to the electronic device 6 is preferably 55% to 90% of the tire height H in the tire radial direction from the seat contact surface 5a to the ground contact surface 3a. When the distance L is 55% or more of the tire height H, the electronic device 6 can be disposed near the high temperature part Hp, and the measurement accuracy can be improved. When the distance L is 90% or less of the tire height H, the exposure of the electronic device 6 due to tire wear is suppressed, which helps to improve the durability of the electronic device 6.

[0019] The electronic device 6 of this embodiment is disposed radially inward of the completely worn position Cw at which the tire becomes unusable. Such electronic device 6 can monitor the tire until the tire becomes unusable. The completely worn position Cw is, for example, a groove bottom position at the tread end position when a groove 3b is formed in the contact surface 3a. The completely worn position Cw may also be, for example, any position marked on the tire side or the like.

[0020] The electronic device 6 of this embodiment is disposed in the central region Ca. Here, the central region Ca is a region in which a width W1 centered on the tire equator C is within 40% of a width W2 in the tire axial direction of the sheet contact surface 5a. By disposing such electronic device 6 in the central region Ca, it is possible to suppress the occurrence of cracks originating from the electronic device 6, and further, since it can be disposed in the vicinity of the high temperature part Hp, it is useful for achieving both measurement accuracy and durability.

[0021] The industrial vehicle solid tire 1 has at least one bead core 7 (four in this embodiment) embedded in the tire circumferential direction on the radially inner side of the tire. When mounted on a rim 4, such an industrial vehicle solid tire 1 can bring the seat contact surface 5a into strong contact with the seat portion 4a of the rim 4, improving vertical rigidity and improving operability when mounted as a rear wheel that is a steering wheel.

[0022] It is desirable to mount the industrial vehicle solid tire 1 on all wheels of the industrial vehicle. For example, the industrial vehicle may display the monitoring results for each mounted industrial vehicle solid tire 1, or may display when a problem occurs in any of the industrial vehicle solid tires 1. Such an industrial vehicle solid tire 1 can monitor all wheels of the industrial vehicle.

[0023] Fig. 3 is a cross-sectional view of an industrial vehicle solid tire 11 according to a second embodiment. The same components as those in the above-mentioned embodiment are given the same reference numerals, and the description thereof will be omitted. As shown in Fig. 3, the industrial vehicle solid tire 11 according to the second embodiment includes a plurality of rubber layers 12 overlapped in the tire radial direction, similar to the above-mentioned industrial vehicle solid tire 1.

[0024] The multiple rubber layers 12 desirably include a tread rubber layer 13 having a ground contact surface 13a, and a base rubber layer 15 having a seat contact surface 15a that can contact the seat portion 4a of the rim 4. The multiple rubber layers 12 of the second embodiment include a center rubber layer 18 located between the base rubber layer 15 and the tread rubber layer 13. Each of these multiple rubber layers 12 can be composed of a rubber composition according to the required function.

[0025] The industrial vehicle solid tire 11 of the second embodiment includes at least one electronic device 6, similar to the above-mentioned industrial vehicle solid tire 1. The electronic device 6 of the second embodiment is disposed in the center rubber layer 18. As in the above-mentioned embodiment, the electronic device 6 is disposed radially inward of the complete wear position Cw where the tire becomes unusable, for example, the groove bottom position of the groove 13b. Such an electronic device 6 can be disposed near the high temperature portion Hp without being directly affected by the deformation of the tread rubber layer 13, which helps to achieve both durability and measurement accuracy.

[0026] The industrial vehicle solid tire 11 of the second embodiment has four bead cores 7 embedded on the radially inner side of the tire, extending in the tire circumferential direction, like the above-mentioned industrial vehicle solid tire 1. When mounted on the rim 4, such an industrial vehicle solid tire 11 can bring the seat contact surface 15a into strong contact with the seat portion 4a of the rim 4, improving vertical rigidity and improving operability when mounted as a rear wheel that is a steering wheel.

[0027] Fig. 4 is a cross-sectional view of an industrial vehicle solid tire 21 of the third embodiment. The same components as those in the above-mentioned embodiments are given the same reference numerals, and the description thereof will be omitted. As shown in Fig. 4, the industrial vehicle solid tire 21 of the third embodiment includes a plurality of rubber layers 22 overlapped in the tire radial direction, similar to the above-mentioned industrial vehicle solid tire 1.

[0028] The multiple rubber layers 22 desirably include a tread rubber layer 23 having a ground contact surface 23a, and a base rubber layer 25 having a seat contact surface 25a that can contact the seat portion 4a of the rim 4. The multiple rubber layers 22 of the third embodiment include a center rubber layer 28 located between the base rubber layer 25 and the tread rubber layer 23, similar to the multiple rubber layers 12 described above. Each of these multiple rubber layers 22 can be composed of a rubber composition according to the required function.

[0029] The industrial vehicle solid tire 21 of the third embodiment includes at least one electronic device 6, similar to the above-mentioned industrial vehicle solid tire 1. The electronic device 6 of the third embodiment is disposed at the boundary between the tread rubber layer 23 and the center rubber layer 28. As in the above-mentioned embodiment, the electronic device 6 is disposed radially inward of the complete wear position Cw where the tire becomes unusable, for example, the groove bottom position of the groove 23b. Such an electronic device 6 can be disposed when the tread rubber layer 23 and the center rubber layer 28 are laminated, which helps reduce manufacturing costs.

[0030] The industrial vehicle solid tire 21 of the third embodiment has four bead cores 7 embedded on the radially inner side of the tire, extending in the tire circumferential direction, like the above-mentioned industrial vehicle solid tire 1. When mounted on the rim 4, such an industrial vehicle solid tire 21 can bring the seat contact surface 25a into strong contact with the seat portion 4a of the rim 4, improving vertical rigidity and improving operability when mounted as a rear wheel that is a steering wheel.

[0031] Although a particularly preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment and can be modified in various ways.

[0032] [Note] The present invention is as follows.

[0033] [Invention 1] A solid tire for an industrial vehicle, A plurality of rubber layers overlapped in a radial direction of the tire; at least one electronic device; the plurality of rubber layers includes a base rubber layer having a seat contact surface capable of contacting a seat portion of a rim, the electronic device is disposed in a rubber layer other than the base rubber layer among the plurality of rubber layers, Solid tires for industrial vehicles.

[0034] [Invention 2] The plurality of rubber layers includes a tread rubber layer having a ground contact surface, The solid tire for industrial vehicles according to the first aspect of the present invention, wherein the electronic device is disposed in the tread rubber layer.

[0035] [Invention 3] The plurality of rubber layers include a tread rubber layer having a ground contact surface, and a center rubber layer located between the base rubber layer and the tread rubber layer, The solid tire for industrial vehicles according to the first aspect of the present invention, wherein the electronic device is disposed in the center rubber layer.

[0036] [Invention 4] The plurality of rubber layers include a tread rubber layer having a ground contact surface, and a center rubber layer located between the base rubber layer and the tread rubber layer, The solid tire for industrial vehicles according to the first aspect of the present invention, wherein the electronic device is disposed at a boundary between the tread rubber layer and the center rubber layer.

[0037] [Invention 5] A solid tire for industrial vehicles according to any one of claims 1 to 3, wherein the distance in the tire radial direction from the seat contact surface to the electronic device is 55% to 90% of the tire height in the tire radial direction from the seat contact surface to the ground contact surface.

[0038] [Invention 6] The solid tire for industrial vehicles according to the present invention 5, wherein the electronic device is arranged radially inward of a completely worn position at which the tire becomes unusable.

[0039] [Invention 7] The solid tire for industrial vehicles according to any one of claims 1 to 6, wherein the electronic device is arranged in a central region that is within 40% of the axial width of the seat contact surface with the tire equator as the center.

[0040] [Invention 8] 8. The solid tire for industrial vehicles according to any one of claims 1 to 7, wherein the electronic device is capable of measuring an internal temperature of the tire.

[0041] [The present invention 9] An industrial vehicle equipped with the solid tire for industrial vehicles according to any one of claims 1 to 8. [Explanation of symbols]

[0042] 1. Solid tires for industrial vehicles 2 Rubber layers 4 Rims 4a Seat section 5 Base rubber part 5a Sheet contact surface 6 Electronic equipment

Claims

1. A solid tire for an industrial vehicle, A plurality of rubber layers overlapped in a radial direction of the tire; at least one electronic device; the plurality of rubber layers includes a base rubber layer having a seat contact surface capable of contacting a seat portion of a rim, the electronic device is disposed in a rubber layer other than the base rubber layer among the plurality of rubber layers, Solid tires for industrial vehicles.

2. The plurality of rubber layers includes a tread rubber layer having a ground contact surface, The solid tire for industrial vehicles according to claim 1 , wherein the electronic device is disposed in the tread rubber layer.

3. The plurality of rubber layers include a tread rubber layer having a ground contact surface, and a center rubber layer located between the base rubber layer and the tread rubber layer, The solid tire for industrial vehicles according to claim 1 , wherein the electronic device is disposed in the center rubber layer.

4. The plurality of rubber layers include a tread rubber layer having a ground contact surface, and a center rubber layer located between the base rubber layer and the tread rubber layer, 2. The solid tire for industrial vehicles according to claim 1, wherein the electronic device is disposed at a boundary between the tread rubber layer and the center rubber layer.

5. 2. The solid tire for industrial vehicles according to claim 1, wherein a distance in a radial direction of the tire from the seat contact surface to the electronic device is 55% to 90% of a tire height in the radial direction of the tire from the seat contact surface to a ground contact surface.

6. 6. The solid tire for industrial vehicles according to claim 5, wherein the electronic device is disposed radially inward of a completely worn position at which the tire becomes unusable.

7. 2. The solid tire for industrial vehicles according to claim 1, wherein the electronic device is disposed in a central region that is within 40% of the width of the seat contact surface in the axial direction of the tire with the tire equator as the center.

8. 2. The solid tire for industrial vehicles according to claim 1, wherein the electronic device is capable of measuring an internal temperature of the tire.

9. An industrial vehicle equipped with the solid tire for industrial vehicles according to any one of claims 1 to 8.

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