Non-contact power supply pavement structure bonded to the pavement surface and construction method of the pavement structure

Abstract

To enable non-contact power supply to electric vehicles while in running without changing the configuration of pavement structures.SOLUTION: A pavement structure equipped with a power supply unit 5 which supplies power to a power receiving device of a running body in a non-contact manner, comprises a leveling layer 1 which is provided on a surface layer 12b and eliminates fine unevenness of the surface layer 12b, an adhesive layer 3 which is provided on the leveling layer 1, a feeding unit 5 provided so as to extend in the direction in which the running body runs on the adhesive layer 3 and bonded to the surface layer 12b and the leveling layer 1 by an adhesive, and a rubbing layer 7 to fill the step between the surface layer 12b and the power supply unit 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a non-contact power supply structure that is bonded to a pavement surface and a method for constructing the pavement structure. [Background technology]

[0002] Vehicles equipped with secondary batteries, such as electric vehicles (EVs) and hybrid electric vehicles (HEVs), use the power stored in the secondary batteries to rotate a motor, which then drives the wheels with the torque of the motor. Vehicles that run on power stored in secondary batteries do not emit substances that have a negative impact on the environment, such as nitrogen oxides and carbon dioxide, and are therefore desirable for widespread use from the perspective of environmental conservation. Electric vehicles that run on power from secondary batteries must be charged when the battery's charge level becomes low. A common charging method is to connect the electric vehicle to a power supply device at a charging station or at home.

[0003] However, the electric vehicle must wait in place without moving until the secondary battery is fully charged. Therefore, when traveling long distances in an electric vehicle, there is a problem that the vehicle must stop frequently at charging stations, etc., and spend a considerable amount of time charging the secondary battery.

[0004] In addition, the distance that can be traveled on a single charge depends on the capacity of the secondary battery, and measures to extend the distance that can be traveled include increasing the capacity of the secondary battery installed, but this poses problems such as an increase in the vehicle weight and manufacturing costs.

[0005] To solve these problems, technology has been proposed that enables contactless power supply while driving. This would enable long-distance driving, which is a challenge for electric vehicles. As part of the development of infrastructure for this purpose, pavement structures that supply power from the roadway have also been proposed. For example, a pavement structure in which a contactless power supply unit is embedded in an existing pavement body (Patent Document 1), a pavement structure in which a trough is placed in an existing pavement structure and a contactless power supply unit is provided (Patent Document 2), and a structure in which a power supply conductor is embedded in an existing pavement structure (Patent Document 3) have been proposed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-181546 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-044422 [Patent Document 3] Japanese Patent Application Publication No. 2017-163798 Summary of the Invention [Problem to be solved by the invention]

[0007] The thickness of each layer of a pavement structure is designed based on the traffic conditions of large vehicles and the bearing capacity of the roadbed. However, if the interior of the pavement structure is recessed and a power supply coil is installed, the structural strength of the pavement structure is reduced (see Patent Documents 1 to 3). Furthermore, if a resin void structure is embedded below the power supply coil to improve drainage, the pavement structure must be modified and rebuilt in a way that reduces its structural strength. Therefore, to install a power supply coil without reducing the structural strength of the pavement, it is necessary to design the pavement structure and improve it to have a specified durability, which requires significant costs.

[0008] Furthermore, when a power feeder is buried in a pavement structure, the power feed efficiency may be affected depending on the material of the member the power feeder is buried in. For example, when a high-frequency current in the MHz range is transmitted to a conductor, the propagation loss of the high-frequency power changes significantly depending on the electrical properties of the conductor's surroundings, such as its dielectric constant and dielectric loss tangent.

[0009] The present invention was made in consideration of the above circumstances, and aims to provide a non-contact power supply pavement structure that is bonded to the pavement surface and that enables non-contact power supply to electric vehicles while they are traveling without changing the structure of the existing pavement structure, and a method for constructing such a pavement structure. [Means for solving the problem]

[0010] (1) In order to achieve the above object, the present invention employs the following means: That is, the pavement structure of the present invention is a pavement structure equipped with a power supply unit that supplies power to a power receiving device of a traveling object in a non-contact manner, and is characterized by comprising: a leveling layer provided on a surface layer to eliminate small irregularities on the surface of the surface layer; an adhesive layer provided on the leveling layer; a power supply unit provided on the adhesive layer so as to extend in the direction of travel of the traveling object and adhered to the surface layer and leveling layer with an adhesive; and a rubbing layer that fills in any differences in level between the surface layer and the power supply unit.

[0011] In this way, with the pavement structure of the present invention, a power supply unit can be easily, quickly, and reliably added and installed to a pavement structure already in use or a new, conventional pavement structure constructed using conventional design methods (hereinafter referred to as "existing pavement structure"). As a result, there is no need to renovate the existing pavement structure, change the design of the pavement structure, or improve the pavement structure, which makes it possible to reduce costs. Furthermore, because the power supply unit is not buried, the material of the buried member does not affect the power supply efficiency.

[0012] (2) In the pavement structure of the present invention, the tensile strength of the power supply unit is 3 MPa or more.

[0013] In this way, the power feeder unit has a tensile strength of 3 MPa or more, so that it can withstand traffic loads and is not susceptible to damage due to the action of traffic loads.

[0014] (3) In the pavement structure of the present invention, the linear expansion coefficient of the power supply unit is 100×10 -6 / °C or less.

[0015] In this way, in the power supply unit, the linear expansion coefficient is 100 × 10 -6 / °C, existing pavement structures and the pavement structure of the present invention can be maintained without risk of damage.

[0016] (4) Furthermore, in the pavement structure of the present invention, the surface of the power supply unit is characterized by being subjected to an anti-slip treatment having a coefficient of friction of 0.25 or more.

[0017] In this way, the surface of the power supply unit has been treated with an anti-slip coating with a coefficient of friction of 0.25 or more, allowing the tires of the moving object to grip firmly.

[0018] (5) The pavement structure of the present invention is characterized in that the adhesive layer has an adhesive strength of 0.6 MPa or more.

[0019] In this way, the adhesive layer has an adhesive strength of 0.6 MPa or more, so that it can withstand the action of traffic loads and temperature stress.

[0020] (6) In the pavement structure of the present invention, the rubbing layer is characterized in that it forms an inclined surface with a gradient of 5% or less between the surface of the power supply unit and the surface layer.

[0021] In this way, by making the gradient of the rubbing layer 5% or less, it is possible to eliminate the difference in level between the pavement structure of the present invention and the existing pavement structure.

[0022] (7) Furthermore, the method for constructing a pavement structure of the present invention is a method for constructing a pavement structure equipped with a power supply unit that supplies power to a power receiving device of a moving body without contact, and is characterized by including the steps of providing a leveling layer that eliminates small irregularities on the surface of the pavement, providing an adhesive layer on the leveling layer, adhering the power supply unit with the adhesive layer so that it extends on the adhesive layer in the direction in which the moving body moves, and providing a rubbing layer that fills in any differences in level between the surface layer and the power supply unit.

[0023] This allows the power supply unit to be installed easily, quickly, and reliably on existing pavement structures. As a result, there is no need to renovate the existing pavement structure, nor is there a need to change the design of the pavement structure or improve the pavement structure, which reduces costs. Furthermore, because the power supply unit is not buried, the material of the buried member does not affect the power supply efficiency. [Effects of the Invention]

[0024] According to the present invention, a power supply unit can be easily and quickly installed on an existing pavement structure. As a result, there is no need to renovate the existing pavement structure, change the design of the pavement structure, or improve the pavement structure, which reduces costs. Furthermore, because the power supply unit does not need to be buried, the material of the buried member does not affect the power supply efficiency. [Brief explanation of the drawings]

[0025] [Figure 1] A schematic cross-sectional view showing an example of the cross-sectional structure of a pavement structure according to an embodiment of the present invention. [Figure 2] 1 is a flowchart showing an example of a construction method for a pavement structure according to an embodiment of the present invention. [Figure 3] FIG. 1 is a diagram illustrating an example of use of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] (Composition of pavement structure) An embodiment of the present invention will be described with reference to the drawings. To facilitate understanding of the description, the same reference numerals are used to designate the same components in the drawings, and duplicated descriptions will be omitted. Note that in the structural diagrams, the size of each component is shown conceptually and does not necessarily represent the actual dimensional ratio.

[0027] FIG. 1 is a schematic cross-sectional view showing an example of the cross-sectional structure of a pavement structure 100 according to this embodiment. The pavement structure 100 according to this embodiment is provided on a roadbed (not shown) and includes a roadbed 10 consisting of a lower roadbed and an upper roadbed. A surface layer 12b is provided on a base layer 12a on this roadbed 10. A leveling layer 1 is provided on the surface (road surface) of the surface layer 12b. The leveling layer 1 is intended to eliminate unevenness on the surface of the surface layer 12b. The leveling layer 1 can be made of a mixture using a resin-based binder, for example.

[0028] An adhesive layer 3 is provided on this leveling layer 1. The adhesive layer 3 is intended to attach the leveling layer 1 and the power supply unit 5. The adhesive layer 3 is attached so that its adhesive strength is 0.6 MPa or more to withstand the effects of traffic loads and temperature stress. While an adhesive strength of 0.6 MPa or more is sufficient, it is preferable that the adhesive layer 3 be attached with an adhesive strength of approximately 1.4 to 3.0 MPa. The power supply unit 5 is attached on top of the adhesive layer 3.

[0029] As shown in FIG. 1, the power supply unit 5 of the present invention is installed in the center of a lane to supply power to a traveling object (e.g., an electric vehicle) in a contactless manner. The width of the power supply unit 5 is 0.3 m to 1.5 m, preferably approximately 0.6 m to 1.2 m. As shown in FIG. 3, the power supply unit 5 is installed so as to be positioned between the left and right tires of the traveling object C. The power supply unit 5 of the present invention has a height of approximately 12 mm from the surface (road surface) of the surface layer 12b, and the leveling layer 1 has a thickness of approximately 1 mm from the surface (road surface) of the surface layer 12b. The adhesive layer 3 has a thickness of approximately 1 mm from the upper surface of the leveling layer 1, and the power supply unit 5 has a thickness of approximately 10 mm from the upper surface of the adhesive layer 3. The rubbing layer 7 is sloped from the upper surface of the power supply unit 5 toward the surface (road surface) of the surface layer 12b, and is rubbed so that the slope is 5% or less to correct any unevenness.

[0030] The power supply unit 5 employs a non-contact power supply system. The base material of the power supply unit 5 must be strong enough to withstand traffic loads. For example, resin materials such as FRP and ABS can be used. The power supply unit 5 (base material) preferably has a tensile strength of 3 MPa or more. In order to maintain existing pavement structures and the pavement structure of the present invention without risk of damage, the power supply unit 5 (base material) should have a linear expansion coefficient of 100 × 10 -6 / °C or less is preferable.

[0031] The surface 5a of the power supply unit 5 can be treated with an anti-slip coating. The purpose is to provide the surface of the power supply unit 5 with resistance to ensure a safe and comfortable road surface for road users, including vehicles and people. The surface of the power supply unit 5 is treated to have a coefficient of friction of 0.25 or higher. For example, sand or glass beads are fixed with resin to create unevenness. This treatment can be done at the factory where the power supply unit 5 is manufactured, or at the construction site.

[0032] The purpose of the rubbing layer 7 is to correct the difference in level between the surface of the power supply unit 5 and the surface of the surface layer 12b (road surface). It must have the strength to withstand traffic loads. For example, a mixture of resin and sand can be used as the rubbing material. The rubbing layer 7 is configured to have a gradient of 5% or less to ensure a safe and comfortable road surface for road users such as vehicles and people.

[0033] [Construction method of pavement structure] An example of a method for manufacturing the pavement structure 100 will now be described. Figure 2 is a flowchart showing an example of a method for constructing a pavement structure according to an embodiment of the present invention. First, a leveling layer is provided to eliminate small irregularities on the surface (road surface) of the surface layer 12b (step S1). That is, a leveling layer 1 is provided to smooth out unevenness in the surface layer 12b of an existing pavement structure.

[0034] Next, adhesive 3 is applied to the surface of leveling layer 1 at a location where power supply unit 5 is to be installed (step S2).

[0035] Next, the power supply unit 5 is placed on the adhesive applied in step S2 (step S3). The power supply unit 5 is installed in a factory-prepared roll or panel form. For example, if the power supply unit 5 is wound in a roll, it can be transported to the construction site and pulled out from the core of the roll, allowing the power supply unit 5 to be quickly installed. In step S3, it is also important to hold the adhesive until it completely hardens.

[0036] Next, the difference in level between the surface of the power supply unit 5 and the surface of the surface layer (road surface) is adjusted (step S4). To adjust the difference in level, a rubbing material such as a mixture of resin and sand is applied. At this time, surface 5a of power supply unit 5 may be treated to be non-slip, or surface 5a may be treated when power supply unit 5 is manufactured in a factory before transportation.

[0037] The present invention is not limited to the above-described embodiments, and various modifications and equivalents are included within the spirit and scope of the present invention. Furthermore, the structure, shape, number, position, size, etc. of the components shown in each drawing are for the convenience of explanation and may be changed as appropriate. [Explanation of symbols]

[0038] 100...Pavement structure 1...Leveling layer 3...adhesive layer 5...Power supply unit 5a…Surface 7...Rubbing layer 10...Roadbed 12a…Base layer 12b...surface layer

Claims

1. A pavement structure including a power supply unit that supplies power to a power receiving device of a traveling body in a non-contact manner, a leveling layer provided on the surface layer to eliminate fine irregularities on the surface of the surface layer; an adhesive layer provided on the leveling layer; a non-buried power supply unit provided on the adhesive layer so as to extend in the direction in which the traveling body travels, and adhered to the surface layer and the leveling layer via the adhesive layer; a rubbing layer that fills in any step between the surface layer and the power supply unit, the surface of the power supply unit is subjected to an anti-slip treatment with a sliding friction coefficient of 0.25 or more; A pavement structure characterized in that the rubbing layer forms an inclined surface with a gradient of 5% or less between the surface of the power supply unit and the surface layer.

2. 2. A pavement structure according to claim 1, wherein the tensile strength of the power supply unit is 3 MPa or more.

3. The linear expansion coefficient of the power supply unit is 100×10 －６ 3. A pavement structure according to claim 1 or claim 2, characterized in that the thermal expansion coefficient is 0.1 / °C or less.

4. 4. A pavement structure according to claim 1, wherein the adhesive layer has an adhesive strength of 0.6 MPa or more.

5. A construction method for a pavement structure including a power supply unit that supplies power to a power receiving device of a traveling body in a non-contact manner, a step of providing a leveling layer to eliminate small irregularities on the surface of the pavement; providing an adhesive layer on the leveling layer; a step of adhering a non-buried power supply unit with the adhesive layer so that the power supply unit extends on the adhesive layer in a direction in which the traveling body travels; providing a rubbing layer that fills in any step between the surface layer and the power supply unit; A construction method for a pavement structure, comprising the steps of: applying an anti-slip treatment to the surface of the power supply unit with a sliding friction coefficient of 0.25 or more; and forming an inclined surface with a gradient of 5% or less between the surface of the power supply unit and the surface layer using the rubbing layer.

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