Apparatus for lifting wireless charging transmitter based on vehicle load using hydraulic system

Abstract

The present invention relates to a vehicle load-based hydraulic wireless charging transmitter lifting device. It comprises: a hydraulic generator that generates hydraulic pressure by receiving the load of a vehicle equipped with a wireless charging receiver; a transmitter positioned to have a lifting function below the receiver of the vehicle; a lifting type transmitter unit equipped with a lifting actuator that receives hydraulic pressure from the hydraulic generator through a hydraulic pipe and raises the transmitter toward the receiver; and a spacing unit that maintains the distance between the transmitter and the receiver at a set distance. The vehicle load-based hydraulic wireless charging transmitter lifting device of the present invention, constructed as described above, has a structure that generates hydraulic pressure using the vehicle's load and raises the wireless charging transmitter using the generated hydraulic pressure. Since this allows for the lifting operation of the transmitter without a separate electric motor, wireless charging can be performed while minimizing overall power consumption. Furthermore, by adjusting the hydraulic pressure value according to vehicle conditions to prevent excessive raising of the transmitter, the distance between the transmitter and the receiver can be stably maintained, thereby improving charging stability.

Description

Technology Field

[0001] The present invention relates to a charging device for charging a battery mounted in an electric vehicle, and more specifically, to a vehicle load-based hydraulic wireless charging transmitter lifting device. Background Technology

[0002] With the increasing adoption of electric vehicles, various technologies are being developed to improve the convenience and stability of battery charging. Among these technologies is contactless wireless charging technology. Wireless charging technology operates on the principle of transmitting power using magnetic induction or resonance phenomena between a transmitter and a receiver.

[0003] The charging efficiency in a wireless charging system can vary depending on the distance or relative position between the transmitter and the receiver. For instance, if the positions of the transmitter and receiver are misaligned or the distance between them increases, the charging efficiency drops sharply, and in severe cases, charging may not occur at all.

[0004] Conventionally, electronic control methods using electric motors have been applied to adjust the distance between the transmitter and the receiver. However, this electronic control method has the problem of reduced overall system energy efficiency because it requires additional power consumption separate from charging power to drive the motor. Furthermore, the accumulation of such non-load power leads to an increase in total power consumption. In addition, since electronic drive devices are based on complex control circuits, equipment setup is difficult, and the overall system may be excessively complex or have high control sensitivity, which may result in reduced stability when, for example, operated outdoors.

[0005] There is a demand for wireless charging technology that can automatically secure the optimal spacing according to vehicle conditions without causing unnecessary power consumption or control sensitivity, thereby consistently maintaining wireless charging efficiency.

[0006] The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art. The problem to be solved

[0007] The present invention was created to resolve the above-mentioned problems, and its purpose is to provide a vehicle load-based hydraulic wireless charging transmitter lifting device that utilizes hydraulic pressure generated by the vehicle load to raise the wireless charging transmitter and mechanically and precisely adjust the distance with respect to the receiver.

[0008] In addition, the present invention aims to provide a vehicle load-based hydraulic wireless charging transmitter lifting device capable of responding to various vehicle conditions through a lifting structure utilizing hydraulics without a separate electric motor.

[0009] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems can be clearly understood by those skilled in the art from the description of the invention below. means of solving the problem

[0010] As a means of solving the problem to achieve the above objective, the vehicle load-based hydraulic wireless charging transmitter lifting device of the present invention comprises: a hydraulic generating unit that generates hydraulic pressure by receiving the load of a vehicle on which a wireless charging receiver is mounted; a transmitter disposed to have a lifting function below the receiver of the vehicle; a lifting type transmitting unit equipped with a lifting actuator that receives hydraulic pressure from the hydraulic generating unit through a hydraulic pipe and raises the transmitter toward the receiver; and a spacing maintaining unit that maintains the distance of the transmitter relative to the receiver at a set distance.

[0011] In addition, the above-mentioned gap-maintaining unit includes a vertical actuator that operates by receiving hydraulic pressure from a hydraulic power generator through a hydraulic pipe, and a limit rod that is raised by the vertical actuator and deploys a stopper after the upper end contacts the receiver, thereby causing the receiver, which is raised by the lifting actuator, to stop by being caught on the stopper.

[0012] In addition, a hydraulic fluid tank is further included to pass hydraulic fluid transmitted from the above hydraulic fluid generating unit and supply it to a transmitting unit and a spacing unit.

[0013] In addition, the hydraulic generating unit comprises: a cylinder body having an outlet port and an inlet port for receiving hydraulic fluid, and a plunger that is partially received in the cylinder body and descends while being stepped on by a vehicle wheel to extrude the hydraulic fluid within the cylinder body through the outlet port.

[0014] In addition, the hydraulic pipe comprises: a first hydraulic pipe connecting the outlet port of the cylinder body to the hydraulic fluid tank, a second hydraulic pipe connecting the hydraulic fluid tank to the transmission unit, and a third hydraulic pipe connecting the hydraulic fluid tank to the spacing unit; a first valve is mounted on the first hydraulic pipe, a second valve on the second hydraulic pipe, and a third valve on the third hydraulic pipe, respectively, and a valve driving unit for controlling the first, second, and third valves is provided.

[0015] In addition, a fourth hydraulic pipe connecting the hydraulic oil tank and the second hydraulic pipe, and a fifth hydraulic pipe connecting the hydraulic oil tank and the third hydraulic pipe are further included, a first hydraulic pump is installed in the fourth hydraulic pipe, and a second hydraulic pump is mounted in the fifth hydraulic pipe.

[0016] In addition, the hydraulic fluid tank and the inlet port of the cylinder body are connected by a sixth hydraulic pipe, and the sixth hydraulic pipe is equipped with a fourth valve operated by the valve driving unit and a return pump that pumps a portion of the hydraulic fluid in the hydraulic fluid tank to the hydraulic fluid generating unit when the fourth valve is opened.

[0017] In addition, a spring that elastically supports the transmitter is installed between the above-mentioned lifting actuator and the transmitter.

[0018] In addition, the upper part of the transmitting part is provided with a protrusion that prevents the transmitting part from coming into close contact with the receiving part.

[0019] Additionally, a vertical guide passage is formed in the lifting section, and the limit rod is capable of moving up and down while passing through the guide passage and includes a rod body having an upper groove that is open to the top and a stopper receiving space provided at the bottom of the upper groove that is open to the side and accommodates the stopper, and a lifting body that is supported by a spring while accommodated in the upper groove and lowers by an external force to deploy the stopper.

[0020] In addition, the stopper is rotatably supported within the stopper receiving space through a horizontal support pin and has a head having a driven tooth portion formed on its outer surface, and an extension arm integrally formed with the head and extended in the longitudinal direction, and the upper groove communicates with the stopper receiving space through a connecting passage, and the lifting body is integrally formed with a lifting rack having a driving tooth portion that extends toward the stopper receiving space and meshes with the driven tooth portion.

[0021] In addition, a lowering limiting part that limits the lowering of the lifting rack is further provided inside the stopper receiving space.

[0022] In addition, a control unit for controlling the operation of the above-mentioned gap-maintaining unit and valve-actuating unit is further included, and the lifting body is equipped with a sensor that generates a signal while in contact with a receiver, and a communication module that transmits the operation signal of the sensor to the control unit so that the control unit stops the operation of the vertical actuator.

[0023] However, the technical problems and means for solving problems that the present invention aims to solve are not limited to the above-mentioned contents, and other unmentioned problems and means for solving problems can be clearly understood by those skilled in the art from the description of the invention below. Effects of the invention

[0024] The vehicle load-based hydraulic wireless charging transmitter lifting device of the present invention, as described above, has a structure that generates hydraulic pressure using the vehicle's load and raises the wireless charging transmitter using the generated hydraulic pressure. Therefore, since the lifting operation of the transmitter can be implemented without a separate electric motor, wireless charging can be performed while minimizing overall power consumption.

[0025] In addition, by adjusting the hydraulic pressure according to vehicle conditions to prevent excessive rise of the transmitter, the distance between it and the receiver can be stably maintained, thereby improving charging stability.

[0026] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by those skilled in the art from the description of the invention below. Brief explanation of the drawing

[0027] The following drawings attached to this specification illustrate embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in the drawings. FIG. 1 is a block diagram showing the overall configuration of a vehicle load-based hydraulic wireless charging transmitter lifting device according to one embodiment of the present invention. FIGS. 2 to 4 are drawings for explaining the structure and operation method of the elevator device illustrated in FIG. 1. FIGS. 5 and 6 are drawings for explaining the structure and operation of the lifting type transmitting unit and spacing unit of FIG. 1. FIGS. 7 and FIGS. 8 are partial cross-sectional views showing the internal configuration of the limit load illustrated in FIG. 6. Specific details for implementing the invention

[0028] An embodiment of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concept of a term to best describe their invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely partial embodiments of the present invention and do not represent all of the technical spirit of the present invention. It should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0029] Additionally, as used herein, “comprise, include” and / or “comprising, including” specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and / or groups thereof.

[0030] Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments.

[0031] The statement that two subjects of comparison are "identical" means that they are "substantially identical." Therefore, substantial identity may include deviations considered low in the industry, for example, deviations within 5%. Additionally, the statement that a parameter is uniform in a given area may mean that it is uniform from an average perspective.

[0032] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0033] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0034] The fact that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0035] Furthermore, where one component is described as being "on," "connected to," or "coupled to" another component, it should be understood that while the components may be directly connected or coupled to each other, another component may be "interposed" between each component, or that each component may be "connected," "coupled," or "coupled" through another component.

[0036] As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Additionally, the use of “may” when describing embodiments of the invention relates to “one or more embodiments of the invention.” Expressions such as “one or more” and “one or more” preceding a list of elements modify the entire list of elements and do not modify individual elements of the list.

[0037] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise, and "C to D" means C or more and D or less, unless specifically stated otherwise.

[0038] When syntax such as "at least one of A, B, and C", "at least one of A, B, or C", "at least one selected from the group of A, B, and C", or "at least one selected from A, B, and C" is used to specify a list of elements A, B, and C, the syntax can refer to any suitable combination.

[0039] The term "use" may be considered synonymous with the term "utilize." As used herein, terms such as "substantially," "about," and similar terms are used as terms of approximation rather than degree, and are intended to account for the inherent variation of a measured or calculated value that would be recognized by a person skilled in the art.

[0040] In this specification, terms such as first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or sections, but these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Accordingly, the first element, component, region, layer, or section discussed below may be named the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0041] Spatial relative terms such as "beneath," "below," "lower," "above," and "upper" may be used in the specification for ease of description to explain the relationship between one element or feature and other element(s) or feature(s) as illustrated in the drawings. Spatially relative positions are to be understood as encompassing different orientations of the device in use or operation, in addition to the orientations depicted in the figures. For example, if the device in the drawing is inverted, the other element is understood as "below" or "below," and the described element is understood as "above" or "upper" of the other element. Thus, the term "below" may encompass both the up and down directions.

[0042] The terms used in this specification are for describing embodiments of the invention and are not intended to limit the invention.

[0043] The wireless charging transmitter lifting device (10) according to the present embodiment described below has a configuration that raises the wireless charging transmitter (43) to an accurate height using hydraulic power and lowers it by its own weight after charging is complete. The hydraulic power used is generated from the load of the vehicle. That is, hydraulic power is generated as the vehicle's wheel (103) steps on the pressing plate (21f) of the hydraulic power generator (21), and the transmitter (43) is raised using the generated hydraulic power. In addition, a spacing unit (50) is operated using a portion of the hydraulic power, and the spacing unit (50) plays the role of maintaining the distance between the transmitter (43) and the vehicle's receiver (105) at an optimal distance. The explanation for this is as follows.

[0044] FIG. 1 is a block diagram showing the overall configuration of a vehicle load-based hydraulic wireless charging transmitter lifting device (10) according to an embodiment of the present invention. FIGS. 2 to 4 are drawings for explaining the structure and operation method of the lifting device shown in FIG. 1, and FIGS. 5 and 6 are drawings for explaining the structure and operation of the lifting type transmitter unit and spacing unit of FIG. 1. In addition, FIGS. 7 and 8 are partial cross-sectional views showing the internal configuration of the limit load shown in FIG. 6.

[0045] As described above, the wireless charging transmitter lifting device (10) according to the present embodiment may include a hydraulic generating unit, a transmitting unit (40), a spacing unit (50), first to sixth hydraulic pipes, first to fourth valves, a hydraulic oil tank (25), a first hydraulic pump (31), a second hydraulic pump (33), a return pump (35), a housing (11 in FIG. 2), a valve driving unit (27), and a control unit (29).

[0046] As illustrated in FIG. 2, the housing (11) is a box-shaped structure buried below the ground of the vehicle (101) charging station and accommodates the aforementioned components inside. Additionally, a support bracket or base may be applied inside the housing (11) to support the components, and a reinforcing structure may also be applied to ensure the rigidity of the housing itself. This reinforcing structure prevents the housing from deforming even when the vehicle's wheels pass over the top of the housing (11) or when a load is applied directly.

[0047] Additionally, an open passage (11e) is provided on one side of the housing (11). The open passage (11e) is a passage that allows a part of the hydraulic generating unit (21) to pass through the upper part of the housing. Through the open passage (11e), the pressing plate (21f) of the hydraulic generating unit (21) protrudes upward and can directly receive the load of the vehicle.

[0048] On the other side of the housing, a transmitter support part (11a) and a lifting guide part (11c) are formed. The transmitter support part (11a) is a stopper that supports the transmitter (43) in a lowered state. The transmitter (43) waits while supported by the transmitter support part (11a). In addition, the lifting guide part (11c) can guide the lifting movement of the spring support plate (42). That is, by preventing unnecessary lateral movement when the spring support plate (42) is lifted, the lifting operation is made stable in the vertical direction.

[0049] The hydraulic power generator (21) is a component that generates hydraulic power by receiving the load of the vehicle (101). The vehicle (101) is an electric vehicle equipped with a wireless charging receiver (105) on the floor surface, and when entering the charging area, the wheel (103) is positioned above the hydraulic power generator (21). When the wheel (103) of the vehicle (101) presses the pressing plate (21f) of the hydraulic power generator (21), the plunger (21c) descends, and the pressure of the fluid stored inside the cylinder body (21a) is provided through the outflow port (21g). The hydraulic power provided by the hydraulic power generator (21) is provided to the transmission unit (40) and the spacing unit (50).

[0050] The hydraulic generating unit (21) includes a cylinder body (21a), a plunger (21c), and a pressing plate (21f).

[0051] The cylinder body (21a) receives hydraulic fluid and has an outflow port (21g) and an inflow port (21h). The outflow port (21g) is a passage through which hydraulic fluid drains and is connected to the first hydraulic pipe (37a). Additionally, the inflow port (21h) is a passage that receives hydraulic fluid delivered through the sixth hydraulic pipe (37g).

[0052] The plunger (21c) is partially housed in the cylinder body (21a) and descends while being stepped on by the wheel (103) of the vehicle to extrude hydraulic fluid within the cylinder body through the outlet port. That is, when the load of the vehicle is applied, it compresses the fluid inside the cylinder body to generate hydraulic pressure. (See FIGS. 3 and 4)

[0053] Additionally, the pressing plate (21f) is a component that is attached to the top of the plunger (21c) and is directly pressed by the vehicle wheel, and normally remains in an inclined state as shown in FIG. 2. When the wheel (103) moves toward the inclined pressing plate (21f), the pressing plate (21f) is pressed by the wheel and transitions to a horizontal state, causing it to descend. That is, it transfers the load of the vehicle to the plunger. Through this structure, the hydraulic generator (21) can provide hydraulic pressure to the transmitter without external power.

[0054] Meanwhile, the transmitting unit (40) includes a transmitting section (43) and a lifting actuator (41). Two lifting actuators (41) may be arranged side by side.

[0055] The transmitter (43) is a component positioned to have a lifting function at the bottom of the receiver (105) of the vehicle (101), and rises by means of a lifting actuator (41) and falls by means of gravity. The transmitter (43) converts the current supplied from the outside into a high-frequency alternating current according to the electromagnetic induction method and generates a magnetic field based on this. The generated magnetic field is wirelessly transmitted to the receiver (105) mounted at the bottom of the vehicle, and the receiver (105) converts the received magnetic field back into current to charge the vehicle's battery.

[0056] Additionally, a plurality of protrusions (43a) are formed on the upper part of the transmitting part (43). The protrusions (43a) serve to prevent the transmitting part (43) from coming into close contact with the receiving part (105). In other words, they are protrusions to secure a minimum gap between the receiving part (105) and the transmitting part (43).

[0057] This wireless charging method is based on the principle of magnetic induction. In particular, the distance (H in FIG. 6) between the transmitter (43) and the receiver (105) is important for maintaining optimal wireless charging efficiency. This is because, since power is transferred by magnetic induction between the transmitter and the receiver in a wireless charging system, the distance between the two directly affects charging efficiency. If the distance is too far, the magnetic coupling weakens, causing a decrease in charging efficiency, and conversely, if it is too close, stable charging may become difficult due to heat generation or misalignment.

[0058] The lifting actuator (41) receives hydraulic pressure from the hydraulic power generator (21) through the hydraulic pipe and hydraulic oil tank (25) and serves to raise the transmitting unit (43) toward the receiving unit. The raised transmitting unit (43) can descend by its own weight when the vehicle (101) comes down from the pressing plate (21f) and no longer receives hydraulic pressure.

[0059] The lifting actuator (41) has a cylinder (41a) and a piston rod (41b), and has a spring support plate (42) at the upper end of the piston rod (41b). When hydraulic pressure is supplied from the hydraulic power generator (21), the piston rod (41b) rises to move the transmitter (43) upward, and the transmitter can be positioned relative to the receiver at the bottom of the vehicle. Subsequently, when the vehicle (101) passes through the pressing plate (21f) of the hydraulic power generator (21) and goes down,

[0060] In addition, a spring (47) and a lifting guide (45) are installed between the spring support plate (42) and the transmitting part (43).

[0061] The spring (47) is compressed when the upward force is continuously applied by the lifting actuator (41) even after the transmitting unit (43) rises and reaches the stopper (55) of the spacing unit (50) described later, thereby maintaining the state in which the transmitting unit (43) is caught on the stopper (55). That is, the upward force of the lifting actuator (41) is converted into an elastic force so that the transmitting unit (43) stops stably at the corresponding height.

[0062] The lifting guide (45) is a structure that guides the transmission unit (43) to maintain vertical alignment during lifting, thereby preventing lateral shaking or misalignment. The lifting guide (45) includes a lower tube (45a) and an upper tube (45b). The lower tube (45a) is a hollow tube fixed vertically to the upper part of the spring support plate (42). Additionally, the upper tube (45b) is a hollow tube-shaped member mounted on the lower part of the transmission unit (43). The upper tube (45b) is inserted into the interior of the lower tube (45a) and can slide while in close contact with the inner surface of the lower tube (45a).

[0063] The hydraulic pressure provided by the hydraulic power generator (21) is transmitted to the cylinder (41a) in sequence through the first hydraulic pipe (37a), the hydraulic oil tank (25), and the second hydraulic pipe (37b). In this description, 'transmission of hydraulic pressure' refers to the flow of hydraulic fluid.

[0064] A first valve (23a) is installed in the first hydraulic pipe (37a), and a second valve (23c) is installed in the second hydraulic pipe (37b). The first valve (23a) and the second valve (23c) can be operated by a valve drive unit (27). The first and second valves (23a, 23b) may be check valves. The valve drive unit (27) serves to open and close the first valve (23a) to the fourth valve (23f). The valve drive unit (27) can be controlled by a control unit (29). The control unit (29) can output all control signals necessary for driving the lifting device (10), including the valve drive unit (27).

[0065] Additionally, the hydraulic fluid tank (25) is a sealed chamber connecting the first hydraulic pipe (37a) and the second hydraulic pipe (37b). By storing a certain amount of hydraulic fluid inside, the hydraulic fluid tank (25) can maintain pressure balance within the hydraulic system and mitigate shocks caused by changes in flow rate. By applying the hydraulic fluid tank (25), the pressure and flow rate of the hydraulic fluid supplied to the cylinder (41a) can be maintained stably.

[0066] Meanwhile, the spacing unit (50) serves to maintain the spacing between the transmitting unit (43) and the receiving unit (105) at a set spacing (H in FIG. 6). The spacing unit (50) includes a vertical actuator (51) and a limit rod (53).

[0067] The vertical actuator (51) operates by receiving hydraulic pressure from the hydraulic power generator through a hydraulic pipe. As shown in FIG. 5, the vertical actuator (51) has a vertically mounted cylinder (51b) and a piston rod (51a). The piston rod (51a) rises when hydraulic pressure is transmitted to the cylinder (51b). The cylinder (51b) is connected to a third hydraulic pipe (37c).

[0068] The limit rod (53) is a component fixed to the upper end of the piston rod (51a) and extends vertically upward through the guide passage (43c). The guide passage (43c) may be formed in the transmitting part (43). The limit rod (53) is raised and lowered by the vertical actuator (51), and as shown in FIG. 6, when its upper end comes into contact with the receiving part (105), the upward movement is restricted and at the same time the stopper (55) is deployed outward.

[0069] The stopper (55) is caught around the guide passage (43c) of the rising transmitter (43), so that even if additional upward pressure is applied to the transmitter by the lifting actuator (41), the transmitter does not rise further and stops at the caught height. At this time, the spring (47) mentioned above is compressed. By applying the stopper (55) as described above, the distance between the transmitter (43) and the receiver (105) can be maintained at an optimal distance (H in FIG. 6). The optimal distance (H) is the distance at which the magnetic coupling degree between the coils (not shown) provided in each of the transmitter and the receiver is formed most efficiently.

[0070] Parts of the limit rod (53) are illustrated in FIGS. 7 and FIGS. 8.

[0071] As described above, the limit rod (53) includes a rod body (53a), a lifting body (56), a sensor (57), a communication module (58), and a pair of stoppers (55).

[0072] The rod body (53a) is a round or polygonal rod capable of moving up and down while passing through the guide passage (43c), and has an upper groove (53c) and a stopper receiving space (53f). The upper groove (53c) and the stopper receiving space (53f) are connected through the lifting passage (53d).

[0073] The upper groove (53c) is a groove that is open upward and accommodates a spring (59) and a lifting body (56) inside it. The spring (59) elastically supports the lifting body (56) upward while being accommodated in the upper groove (53c). The lifting body (56) is elastically supported by the spring (59) while being accommodated in the upper groove (53c). The lifting body (56) protrudes upward from the upper groove (53c). When the limit rod (53) rises and reaches the receiver (105), the lifting body (56) receives a reaction force from the receiver (105), compresses the spring (59), and descends. That is, it descends in the direction of arrow a in Fig. 7.

[0074] Additionally, a sensor (57) and a communication module (58) are installed on the upper part of the lifting body (56). The sensor (57) generates a signal while in contact with the receiver (105). That is, the sensor (57) generates a signal when the lifting body (56) descends due to the aforementioned reaction force, and the edge of the sensor (57) is compressed vertically between the upper part of the load body (53a) and the receiver (105). Furthermore, the communication module (58) transmits the operation signal of the sensor (57) to the control unit, so that the control unit (29) can stop the operation of the vertical actuator (51).

[0075] The lifting body (56) passes through the lifting passage (53d) described above, and is movable in the up and down direction, with part of it being received in the upper groove (53c) and the other part in the stopper receiving space (53f). Because it has this structure, the lifting body (56) can move up and down in the vertical direction, and when in contact with the receiving part (105), it can move downward and compress the spring (59).

[0076] A lifting rack (56a) is integrally formed on the lower side of the lifting body (56). The lifting rack (56a) has a certain thickness and is a portion that extends downward, with driving gears (56b) formed on both sides. The lifting rack (56a) is inserted between the two stoppers (55), and when the lifting body (56) is lowered, the stoppers (55) are deployed in the direction of arrow c in Fig. 8.

[0077] Two stoppers (55) form a pair. Each stopper (55) is rotatably installed within the stopper receiving space (53f) via a horizontal support pin (55f) and is symmetrically positioned on opposite sides with the lifting rack (56a) in between. When the stopper (55) is not unfolded, it is received in the stopper receiving space (53f) as shown in FIG. 7. Also, when unfolded, it spreads outward from the rod body (53a) as shown in FIG. 8.

[0078] Each stopper (55) includes a head (55a) and an extension arm (55c). The head (55a) is a horizontal cylindrical part having a driven tooth portion (55b) on its outer surface. The head (55a) meshes with the driving tooth portion (56b) of the lifting rack (56a). Thus, when the lifting rack (56a) is raised vertically, the head (55a) can rotate in both directions around the support pin (55f).

[0079] The extension arm (55c) is integral with the head (55a) and is a portion that extends in the longitudinal direction. When the head (55a) rotates, the extension arm (55c) rotates in the direction of arrow c and the opposite direction around the support pin (55f).

[0080] In addition, a descent limiting part (53b) that restricts the descent of the lifting rack (56a) is provided in the inner area of ​​the stopper receiving space (53f). The descent limiting part (53b) is a protrusion located at the vertical bottom of the lifting rack (56a) and, as shown in FIG. 8, restricts the lifting rack (56a) from descending further along the descent path of the descending lifting rack (56a). Accordingly, when the lifting rack (56a) descends and comes into contact with the descent limiting part (53b), it can no longer descend, so the downward movement of the lifting rack (56a) stops, and the upward rotation movement of the stopper (55) linked thereto also stops. That is, the descent end point of the lifting rack (56a) acts as the end point of the deployment movement of the stopper (55), and the transmitter (43) is caught on the stopper (55) and cannot go up any further.

[0081] Meanwhile, the above hydraulic pipes include a first hydraulic pipe (37a), a second hydraulic pipe (37b), a third hydraulic pipe (37c), a fourth hydraulic pipe (37e), a fifth hydraulic pipe (37f), and a sixth hydraulic pipe (37g).

[0082] The first hydraulic pipe (37a) connects the outflow port (21g in FIG. 2) of the cylinder body (21a) to the hydraulic oil tank (25), and the second hydraulic pipe (37b) connects the hydraulic oil tank (25) to the cylinder (41a) of the transmission unit (40). Additionally, the third hydraulic pipe (37c) connects the hydraulic oil tank (25) to the cylinder (51b) of the spacing unit, the fourth hydraulic pipe (37e) connects the hydraulic oil tank (25) to the second hydraulic pipe (37b), and the fifth hydraulic pipe (37f) connects the hydraulic oil tank (25) to the third hydraulic pipe (37c). Furthermore, the sixth hydraulic pipe (37g) connects the hydraulic oil tank (25) to the inflow port (21h) of the cylinder body.

[0083] Additionally, a first valve (23a) is installed in the first hydraulic pipe (37a), a second valve (23c) in the second hydraulic pipe (37b), a third valve (23e) in the third hydraulic pipe (37c), a fourth valve (23f) and a return pump (35) in the sixth hydraulic pipe (37g), a first hydraulic pump (31) in the fourth hydraulic pipe (37e), and a second hydraulic pump (33) in the fifth hydraulic pipe (37f). The first, second, third, and fourth valves can be operated by a valve drive unit (27). The flow rate of the hydraulic fluid flowing through the valve drive unit (27) can be controlled. Furthermore, the first hydraulic pump (31), the second hydraulic pump (33), and the return pump (35) can be controlled by a control unit (29).

[0084] The operation of the lifting device (10) having the above configuration is performed as follows: First, when the wheel (103) of the vehicle (101) rises onto the pressing plate (21f), the plunger (21c) descends, and the hydraulic fluid inside the cylinder body (21a) is transferred to the hydraulic fluid tank (25) through the first hydraulic pipe (37a). At this time, the first valve (23a) is opened by the valve driving unit (27), and the second valve (23c), the third valve (23e), and the fourth valve (24f) are closed, so that the hydraulic fluid inside the hydraulic fluid tank (25) is maintained in a state where hydraulic pressure continues to act.

[0085] In the above state, the third valve (23e) is opened to transfer the hydraulic pressure inside the hydraulic fluid tank (25) to the cylinder (51b) of the gap maintenance unit (50) and raise the limit rod (53). When the limit rod (53) is raised and the sensor (57) of the lifting body reaches the receiver (105), the third valve (23e) is closed. At this time, the stopper (55) is in an open state.

[0086] If the amount of hydraulic fluid supplied from the hydraulic fluid tank (25) is too low and the limit rod (53) cannot rise completely, that is, if the sensor (57) cannot rise to the receiver (105), the second hydraulic pump (33) can be operated to supply additional hydraulic fluid to the vertical actuator (51).

[0087] Next, the second valve (23c) is opened to allow hydraulic pressure to be applied to the lifting actuator (41). When hydraulic pressure is applied to the lifting actuator (41), the transmitting unit (43), which is supported by a spring (47), rises. When the rising transmitting unit (43) reaches the stopper (55), it gets caught on the stopper (55) and cannot rise any further, and forms a gap H with the receiving unit (105). At this time, the second valve (23c) is closed. However, if the flow rate of hydraulic fluid applied to the lifting actuator (41) is insufficient and the transmitting unit (43) cannot rise to the stopper (55), the first hydraulic pump (31) is driven to apply additional hydraulic pressure to the lifting actuator (41).

[0088] If the interval of the transmitting unit (43) to the receiving unit (105) is accurately set through the above process, charging is performed. The method of performing charging is general, so a description thereof is omitted.

[0089] When charging is complete, the first, second, and third valves (23a, 23c, 23e) are opened. When the first, second, and third valves are opened, the transmitter (43) descends due to its own weight, and the hydraulic fluid that was injected returns to the hydraulic fluid tank (25). In this state, after opening the fourth valve (23f) and driving the return pump (35), a portion of the hydraulic fluid inside the hydraulic fluid tank (25) flows into the cylinder body (21a) through the inlet port (21h), and the pressing plate (21f) is restored to its original state.

[0090] The wireless charging transmitter lifting device (10) of the present invention, as described above, is structured to generate hydraulic pressure using the load of a vehicle (101) and to lift the wireless charging transmitter using the hydraulic pressure. This allows for the lifting operation of the transmitter to be implemented without a separate electric motor, thereby enabling stable lifting control while minimizing overall power consumption. Additionally, when the transmitter approaches the receiver, it stops at a certain height by means of a limit rod and stopper structure, and maintains that position through the elastic force of a spring, thereby ensuring an optimal distance between the transmitter and the receiver. Accordingly, wireless charging efficiency is maximized, and the possibility of charging position errors or mechanical collisions can be reduced, thereby improving the reliability and stability of the wireless charging system.

[0091] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0092] 10: Lifting device 11: Housing 11a: Transmitter support 11c: Lifting guide 11e: Open passage 21: Hydraulic generating unit 21a: Cylinder body 21c: Plunger 21f: Pressing plate 21g: Outlet port 21h: Inlet port 23a: 1st valve 23c: 2nd valve 23e: 3rd valve 23f: 4th valve 25: Hydraulic oil tank 27: Valve driving unit 29: Control unit 31: 1st hydraulic pump 33: 2nd hydraulic pump 35: Return pump 37a: 1st hydraulic pipe 37b: 2nd hydraulic pipe 37c: 3rd hydraulic pipe 37e: 4th hydraulic pipe 37f: 5th hydraulic pipe 37g: 6th hydraulic pipe 40: Transmitter unit 41: Lifting actuator 41a: Cylinder 41b: Piston rod 42: Spring base plate 43: Transmitter section 43a: Protrusion 43c: Guide passage 45: Lifting guide 45a: Lower tube 45b: Upper tube 47: Spring 50: Spacing unit 51: Vertical actuator 51a: Piston rod 51b: Cylinder 53: Limit rod 53a: Rod body 53b: Lowering limiting section 53c: Upper groove 53d: Lifting passage 53f: Stopper receiving space 55: Stopper 55a: Head 55b: Driven tooth section 55c: Extension arm 55f: Support pin 56: Lifting body 56a: Lifting rack 56b: Drive gear unit 57: Sensor 58: Communication module 59: Spring 101: Vehicle 103: Wheel 105: Receiver unit

Claims

Claim 1 A vehicle load-based hydraulic wireless charging transmitter lifting device comprising: a hydraulic generating unit that generates hydraulic pressure by receiving the load of a vehicle equipped with a wireless charging receiver; a transmitter positioned to have a lifting function below the receiver of the vehicle; a lifting type transmitter unit equipped with a lifting actuator that receives hydraulic pressure from the hydraulic generating unit through a hydraulic pipe and raises the transmitter in the direction of the receiver; and a spacing maintaining unit that maintains the spacing of the transmitter relative to the receiver at a set spacing. Claim 2 A vehicle load-based hydraulic wireless charging transmitter lifting device according to claim 1, wherein the spacing unit comprises: a vertical actuator that operates by receiving hydraulic pressure from a hydraulic power generator through a hydraulic pipe, and a limit rod that is raised by the vertical actuator and deploys a stopper after the upper end contacts the receiver, thereby causing the receiver rising by the lifting actuator to stop by being caught on the stopper. Claim 3 A vehicle load-based hydraulic wireless charging transmitter lifting device, further comprising a hydraulic fluid tank that passes hydraulic fluid transmitted from the hydraulic generator to a transmitting unit and a spacing unit. Claim 4 In paragraph 3, the hydraulic generating unit comprises: a cylinder body having an outlet port and an inlet port for receiving hydraulic fluid, and a plunger partially received in the cylinder body and lowered while being stepped on by a vehicle wheel to extrude the hydraulic fluid within the cylinder body through the outlet port, a vehicle load-based hydraulic wireless charging transmitter lifting device. Claim 5 In claim 4, the hydraulic pipe comprises: a first hydraulic pipe connecting the outlet port of the cylinder body to the hydraulic oil tank, a second hydraulic pipe connecting the hydraulic oil tank to the transmission unit, and a third hydraulic pipe connecting the hydraulic oil tank to the spacing unit; a first valve is mounted on the first hydraulic pipe, a second valve on the second hydraulic pipe, and a third valve on the third hydraulic pipe, respectively, and a valve driving unit for controlling the first, second, and third valves is provided, a vehicle load-based hydraulic wireless charging transmission unit lifting device. Claim 6 In claim 5, a vehicle load-based hydraulic wireless charging transmitter lifting device further includes a fourth hydraulic pipe connecting the hydraulic oil tank and the second hydraulic pipe, and a fifth hydraulic pipe connecting the hydraulic oil tank and the third hydraulic pipe, wherein a first hydraulic pump is installed in the fourth hydraulic pipe and a second hydraulic pump is mounted in the fifth hydraulic pipe. Claim 7 In claim 6, the hydraulic fluid tank and the inlet port of the cylinder body are connected by a sixth hydraulic pipe, and the sixth hydraulic pipe is equipped with a fourth valve operated by the valve driving unit and a return pump that pumps a portion of the hydraulic fluid in the hydraulic fluid tank to the hydraulic generating unit when the fourth valve is opened, a vehicle load-based hydraulic wireless charging transmitter lifting device. Claim 8 In paragraph 2, a vehicle load-based hydraulic wireless charging transmitter lifting device having a spring installed between the lifting actuator and the transmitter to elastically support the transmitter. Claim 9 In paragraph 3, a vehicle load-based hydraulic wireless charging transmitter lifting device is provided with a protrusion on the upper part of the transmitter to prevent the transmitter from coming into close contact with the receiver. Claim 10 In claim 5, the transmission unit has a vertical guide passage formed therein, and the limit rod is capable of moving up and down while passing through the guide passage and comprises a rod body having an upper groove open to the top, a stopper receiving space provided below the upper groove that is open to the side and accommodates the stopper, and a lifting body supported by a spring while accommodated in the upper groove and lowered by an external force to deploy the stopper, a vehicle load-based hydraulic wireless charging transmission unit lifting device. Claim 11 In claim 10, the stopper is rotatably supported within the stopper receiving space through a horizontal support pin and has a head having a driven tooth portion formed on its outer surface, and an extension arm integrally formed with the head and extended in the longitudinal direction, the upper groove communicates with the stopper receiving space through a connecting passage, and the lifting body has a lifting rack integrally formed with a driving tooth portion that extends toward the stopper receiving space and meshes with the driven tooth portion, the vehicle load-based hydraulic wireless charging transmitter lifting device. Claim 12 In claim 11, a vehicle load-based hydraulic wireless charging transmitter lifting device further equipped with a lowering limiting part that limits the lowering of the lifting rack inside the stopper receiving space. Claim 13 A vehicle load-based hydraulic wireless charging transmitter lifting device according to claim 10, further comprising a control unit that controls the operation of the above-mentioned gap-maintaining unit and valve-actuating unit, and wherein the lifting body is equipped with a sensor that generates a signal while in contact with a receiver, and a communication module that transmits the operation signal of the sensor to the control unit so that the control unit stops the operation of the vertical actuator.

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