Solid tire for industrial vehicle and industrial vehicle

Abstract

The present invention provides a solid tire for an industrial vehicle and an industrial vehicle capable of monitoring the state of the tire when the vehicle is traveling. The invention relates to a solid tire (1) for an industrial vehicle. This solid tire (1) for industrial vehicles is provided with: a plurality of rubber layers (2) that overlap in the radial direction of the tire; and at least one electronic device (6). The plurality of rubber layers (2) include a base rubber layer (5) having a seat contact surface (5a) that can come into contact with a seat (4a) of the rim (4). The electronic device (6) is disposed in a rubber layer (2) other than the base rubber layer (5) among the plurality of rubber layers (2).

Description

Technical Field

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

[0002] Conventionally, there is known a solid tire for industrial vehicles suitable for installation on industrial vehicles such as forklifts. For example, Patent Document 1 below proposes a pneumatic cushion tire for industrial vehicles that increases tire life by determining the rubber component of a rubber composition constituting the tread.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-026251

[0004] However, in the solid tire for industrial vehicles such as that disclosed in Patent Document 1, it is necessary to monitor the state of the tire while the vehicle is traveling, similarly to the pneumatic tire. Summary of the invention

[0005] The present invention has been made in view of the above-mentioned actual situation, and a main object of the present invention is to provide a solid tire for an industrial vehicle and an industrial vehicle capable of monitoring the state of the tire while the vehicle is traveling.

[0006] The present invention is a solid tire for industrial vehicles, which includes: multiple rubber layers overlapping in the tire radial direction; and at least one electronic device, the multiple rubber layers including a base rubber layer, the base rubber layer having a seat abutment surface capable of abutting against a seat portion of a rim, and the electronic device is arranged on a rubber layer other than the base rubber layer among the multiple rubber layers.

[0007] The solid tire for industrial vehicles of the present invention has the above-mentioned structure, so that the state of the tire when the vehicle is running can be monitored. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a cross-sectional view showing one embodiment of the solid tire for industrial vehicles according to the present invention.

[0009] Figure 2 This is a schematic diagram showing the temperature distribution of a solid tire for an industrial vehicle during driving.

[0010] Figure 3 It is a cross-sectional view of a solid tire for an industrial vehicle according to a second embodiment.

[0011] Figure 4 It is a cross-sectional view of a solid tire for an industrial vehicle according to a third embodiment.

[0012] Description of Reference Numerals

[0013] 1...solid tire for industrial vehicle; 2...rubber layer; 4...rim; 4a...seat portion; 5...base rubber layer; 5a...seat abutment surface; 6...electronic device. DETAILED DESCRIPTION

[0014] Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

[0015] Figure 1 FIG. 2 is a tire meridian cross-sectional view including the rotation axis of the solid tire 1 for industrial vehicles according to the present embodiment. Figure 1 As shown, the solid tire 1 for industrial vehicles of this embodiment is a tire mounted on at least one of the drive wheels and the steering wheels of industrial vehicles such as forklifts (not shown). For example, industrial vehicles such as forklifts are suitable for using the front wheels as drive wheels and the rear wheels as steering wheels.

[0016] The solid tire 1 for industrial vehicles of the present embodiment includes a plurality of rubber layers 2 stacked in the tire radial direction. Preferably, the plurality of rubber layers 2 include: a tread rubber layer 3 having a ground contact surface 3a; and a base rubber layer 5 having a seat contact surface 5a capable of contacting a seat portion 4a of a rim 4. Such a plurality of rubber layers 2 can be respectively composed of rubber compositions corresponding to the functions required as the ground contact surface 3a and the seat contact surface 5a.

[0017] Figure 2 FIG. 1 is a schematic diagram showing an example of temperature distribution of a solid tire 1 for an industrial vehicle during driving. Figure 2 As shown, the solid tire 1 for industrial vehicles has a tendency to generate local heat during driving. Since industrial vehicles such as forklifts are heavy and have large steering angles, Figure 2 Such heat tends to be generated more significantly in the rear wheels that are steering wheels.

[0018] The reason why the heat generation in the rear wheel increases is, for example, that the lateral force generated when turning with a large steering angle is large. Such heat generation has a high temperature portion Hp where the temperature of the rubber layer 2 other than the base rubber layer 5 among the plurality of rubber layers 2 becomes the highest, and may cause thermal delamination when used under severe conditions such as high-load operation and long-term continuous driving.

[0019] like Figure 1 As shown, the solid tire 1 for industrial vehicles of the present embodiment includes at least one electronic device 6. The electronic device 6 of the present embodiment is disposed on a rubber layer 2 other than the base rubber layer 5 among the plurality of rubber layers 2.

[0020] Such an electronic device 6 can monitor the state of the tire near the high temperature portion Hp where the conditions become the most severe. Therefore, the solid tire 1 for industrial vehicles of this embodiment can monitor the state of the tire when the vehicle is running, and can improve the durability when used under severe conditions.

[0021] As a more preferred embodiment, the electronic device 6 can measure the internal temperature of the tire. The measured internal temperature of the tire is displayed, for example, at a position where the driver can visually recognize the internal temperature of the tire in the industrial vehicle equipped with the solid tire 1 for industrial vehicles. The internal temperature of the tire is not limited to being displayed in this way. For example, when a preset temperature is reached, it can be reported by an alarm or the like, or it can be displayed in a identifiable manner at a management center or the like.

[0022] Such electronic device 6 can directly monitor the internal temperature of the tire when the vehicle is running. In addition, the electronic device 6 is not limited to such a form, for example, it can measure the force and vibration acting on the tire, and can also measure the running distance and continuous running time.

[0023] The plurality of rubber layers 2 of the present embodiment are composed of a tread rubber layer 3 and a base rubber layer 5. Therefore, the electronic device 6 of the present embodiment is disposed on the tread rubber layer 3. Such an electronic device 6 is suitable for monitoring the state of the tread rubber layer 3.

[0024] 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. Since the distance L is more than 55% of the tire height H, the electronic device 6 can be arranged near the high temperature portion Hp, thereby improving the measurement accuracy. Since the distance L is less than 90% 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.

[0025] The electronic device 6 of this embodiment is arranged at a position radially inward of the tire relative to the completely worn position Cw where the tire becomes unusable. Such an electronic device 6 can monitor the tire until the tire becomes unusable. The completely worn position Cw is, for example, the position of the groove bottom at the tread end position when the groove 3b is formed on the contact surface 3a. In addition, the completely worn position Cw may be, for example, an arbitrary position marked on the tire sidewall or the like.

[0026] The electronic device 6 of this embodiment is arranged in the central area Ca. Here, the central area Ca is an area within 40% of the tire axial width W2 of the seat contact surface 5a, with the width W1 centered on the tire equator C. Such an electronic device 6 is arranged in the central area Ca, which can suppress the occurrence of cracks starting from the electronic device 6. In addition, since it can be arranged near the high temperature part Hp, it helps to balance the measurement accuracy and durability.

[0027] The solid tire 1 for industrial vehicles is provided with at least one bead core 7 extending in the tire circumferential direction buried in the inner peripheral side in the radial direction of the tire, and in the present embodiment, four bead cores 7 are buried. Such a solid tire 1 for industrial vehicles can make the seat contact surface 5a strongly contact with the seat portion 4a of the rim 4 when mounted on the rim 4, and can improve the longitudinal rigidity and improve the operability when mounted as a steering wheel, i.e., a rear wheel.

[0028] The solid tire 1 for industrial vehicles is preferably installed on all wheels of the industrial vehicle. The industrial vehicle can display monitoring results for each solid tire 1 for industrial vehicles installed, or display them when a problem occurs in any solid tire 1 for industrial vehicles. Such a solid tire 1 for industrial vehicles can monitor all wheels of the industrial vehicle.

[0029] Figure 3 FIG. 1 is a cross-sectional view of a solid tire 11 for industrial vehicles according to a second embodiment. The same components as those in the above embodiment are denoted by the same reference numerals, and their description is omitted. Figure 3 As shown, the solid tire 11 for industrial vehicles according to the second embodiment includes a plurality of rubber layers 12 stacked in the tire radial direction, similarly to the solid tire 1 for industrial vehicles described above.

[0030] Preferably, the plurality of rubber layers 12 include: a tread rubber layer 13 having a contact surface 13a; and a base rubber layer 15 having a seat contact surface 15a capable of contacting the seat portion 4a of the rim 4. The plurality of 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. Such a plurality of rubber layers 12 can be respectively composed of a rubber composition corresponding to the required function.

[0031] The solid tire 11 for industrial vehicles of the second embodiment includes at least one electronic device 6, similarly to the solid tire 1 for industrial vehicles described above. The electronic device 6 of the second embodiment is arranged on the center rubber layer 18. The electronic device 6 is arranged at a position radially inward of the tire from the completely worn position Cw where the tire becomes unusable, such as the groove bottom position of the groove 13b, similarly to the above-mentioned embodiment. Such an electronic device 6 is not directly affected by the deformation of the tread rubber layer 13, and can be arranged near the high temperature portion Hp, which helps to balance durability and measurement accuracy.

[0032] The solid tire 11 for industrial vehicles of the second embodiment has four bead cores 7 embedded in the inner peripheral side in the tire radial direction and extending in the tire circumferential direction, similarly to the solid tire 1 for industrial vehicles described above. Such a solid tire 11 for industrial vehicles can make the seat contact surface 15a strongly contact the seat portion 4a of the rim 4 when mounted on the rim 4, and can improve the longitudinal rigidity and improve the operability when mounted as a steering wheel, that is, a rear wheel.

[0033] Figure 4 FIG. 2 is a cross-sectional view of a solid tire 21 for industrial vehicles according to a third embodiment. The same components as those in the above-mentioned embodiment are denoted by the same reference numerals, and their description is omitted. Figure 4 As shown, the solid tire 21 for industrial vehicles according to the third embodiment includes a plurality of rubber layers 22 stacked in the tire radial direction, similarly to the solid tire 1 for industrial vehicles described above.

[0034] Preferably, the plurality of rubber layers 22 include: a tread rubber layer 23 having a 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 plurality of 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, similarly to the plurality of rubber layers 12 described above. Each of the plurality of rubber layers 22 can be composed of a rubber composition corresponding to the required function.

[0035] The solid tire 21 for industrial vehicles of the third embodiment includes at least one electronic device 6, similarly to the solid tire 1 for industrial vehicles described above. The electronic device 6 of the third embodiment is arranged at the boundary between the tread rubber layer 23 and the center rubber layer 28. The electronic device 6 is arranged at a position closer to the inner side of the tire radial direction than the completely worn position Cw where the tire becomes unusable, such as the groove bottom position of the groove 23b, similarly to the above-mentioned embodiment. Such an electronic device 6 can be arranged when the tread rubber layer 23 and the center rubber layer 28 are stacked, which helps to reduce the manufacturing cost.

[0036] The solid tire 21 for industrial vehicles of the third embodiment has four bead cores 7 embedded in the inner peripheral side in the tire radial direction and extending in the tire circumferential direction, similarly to the solid tire 1 for industrial vehicles described above. Such a solid tire 21 for industrial vehicles can make the seat contact surface 25a strongly contact the seat portion 4a of the rim 4 when mounted on the rim 4, and can improve the longitudinal rigidity and improve the operability when mounted as a steering wheel, i.e., a rear wheel.

[0037] As mentioned above, although the particularly preferred embodiment of the present invention was described in detail, the present invention is not limited to the above-mentioned embodiment, and can be implemented in various modified forms.

[0038] [Note]

[0039] The present invention is as follows.

[0040] [Present invention 1] A solid tire for an industrial vehicle, wherein:

[0041] The above-mentioned solid tires for industrial vehicles include:

[0042] A plurality of rubber layers overlapped in the radial direction of the tire; and

[0043] at least one electronic device,

[0044] The plurality of rubber layers include a base rubber layer having a seat contact surface capable of contacting a seat portion of the rim.

[0045] The electronic device is disposed on a rubber layer other than the base rubber layer among the plurality of rubber layers.

[0046] [Invention 2] The solid tire for industrial vehicles according to invention 1, wherein:

[0047] The plurality of rubber layers include a tread rubber layer having a contact surface.

[0048] The electronic device is disposed on the tread rubber layer.

[0049] [Invention 3] The solid tire for industrial vehicles according to invention 1, wherein:

[0050] The plurality of rubber layers include: a tread rubber layer having a contact surface; and a center rubber layer located between the base rubber layer and the tread rubber layer.

[0051] The electronic device is disposed on the central rubber layer.

[0052] [Invention 4] The solid tire for industrial vehicles according to invention 1, wherein:

[0053] The plurality of rubber layers include: a tread rubber layer having a contact surface; and a center rubber layer located between the base rubber layer and the tread rubber layer.

[0054] The electronic device is disposed at a boundary between the tread rubber layer and the center rubber layer.

[0055] [Invention 5] According to any one of inventions 1 to 3, a solid tire for industrial vehicles, wherein

[0056] The distance from the seat contact surface to the electronic device in the tire radial direction is 55% to 90% of the tire height from the seat contact surface to the ground contact surface in the tire radial direction.

[0057] [Invention 6] The solid tire for industrial vehicles according to invention 5, wherein:

[0058] The electronic device is arranged at a position radially inward of a position where the tire is completely worn out and becomes unusable.

[0059] [Invention 7] According to any one of inventions 1 to 6, a solid tire for industrial vehicles, wherein

[0060] The electronic device is arranged in a central area centered on the tire equator and within 40% of the tire axial width of the seat contact surface.

[0061] [Invention 8] According to any one of inventions 1 to 7, a solid tire for industrial vehicles,

[0062] The electronic device can measure the internal temperature of the tire.

[0063] [Present invention 9] An industrial vehicle, wherein:

[0064] A solid tire for an industrial vehicle according to any one of the first to eighth aspects of the present invention is mounted thereon.

Claims

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

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

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

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

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

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

7. The solid tire for industrial vehicles according to claim 1, wherein: The electronic device is arranged in a central area centered on the tire equator and within 40% of the width of the seat contact surface in the tire axial direction.

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

9. An industrial vehicle, wherein: A solid tire for an industrial vehicle according to any one of claims 1 to 8 is mounted.

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