AT18208U1 - DEVICE FOR WIRELESS POWER TRANSMISSION FOR CARDAN SHAFTS - Google Patents

Abstract

The invention relates to a device for wireless power transmission between a chassis (2) of a motor vehicle and a cardan shaft (1) which can rotate about an axis of rotation (R) in order to supply a circuit (D) with energy and comprises the following: a sleeve coil carrier (20) for fastening to the surface of the cardan shaft (1), which has an annular section and carries on its body the secondary coil windings (S2); a chassis connection (30) for fastening to the chassis (2) of the motor vehicle and a plate coil carrier (10) which has the primary coil windings (S1) which are designed for wireless power transmission to the secondary coil windings (S2) located on the sleeve coil carrier (20); a power source for supplying the primary coil windings (S1) on said plate coil carrier (10).

Description

Description

DEVICE FOR WIRELESS POWER TRANSMISSION FOR CARDAN SHAFTS

TECHNICAL AREA

[0001] The invention relates to a system for wireless power transmission between a rotating shaft, in particular a cardan shaft, and a fixed point, in particular a chassis of a motor vehicle.

STATE OF THE ART

[0002] Cardan shafts are transmission elements that are used to take over the rotary motion and power generated by the engine of motor vehicles from the engine or transmission and to transfer it to the differential of the motor vehicle in order to move the motor vehicle.

[0003] Due to the positioning of the cardan shafts on the motor vehicle, it is not possible to carry out various measurements via the shaft and for this reason the design of the cardan shaft is carried out according to predictions or simulations that are intended for the conditions and environment that will be relevant for the use of the motor vehicle. However, the methods mentioned are not sufficient to fully represent the field conditions. In addition, such measurements cannot be carried out when the motor vehicle is already in use. A key reason for this is that attaching sensors or measuring devices to the shaft and feeding them into the system is laborious.

[0004] The application with the number TR2017/08500 explains a device for wireless power transmission. Here, the power is transmitted between coil windings that are positioned on coil supports, with one coil support being arranged on the cardan shaft and the other coil support being arranged on the bracket that supports the cardan shaft. Here, the power that is transmitted to the coil that is located on the cardan shaft can be fed into a sensor or measuring device that is positioned on the cardan shaft. Since the transmission can only be provided in the area of the bracket, the embodiments shown are limited to this area.

[0005] In the document with publication number KR101365521B1 another device for wireless power transmission for rotating shafts is explained. Here the power transmission takes place between a coil which is attached to a fixed support point and another coil which is provided on the rotating element. The connection of said coil to the rotating element is provided by fastening arms. The fastening arms can damage the rotating element during connection. At the same time, the device causes the base area of the structure to become larger.

[0006] Finally, all the problems mentioned above have made it necessary to create a novelty in the corresponding field. OBJECT OF THE INVENTION

[0007] The object of the present invention is to eliminate the above-mentioned problems and to create a technical novelty in the corresponding field.

[0008] The main object of the invention is to provide an embodiment which forms an alternative to the systems arranged for wireless power transmission between a cardan shaft and a chassis of a motor vehicle.

[0009] Another object of the invention is to increase the efficiency, in particular in the power transmission between a cardan shaft and a chassis of a motor vehicle.

[0010] Another object of the invention is to provide for the attachment of the coil to the cardan shaft in such a way that no damage is caused to the cardan shaft.

BRIEF DESCRIPTION OF THE INVENTION

[0011] To achieve all the objects mentioned above and which will become apparent from the detailed explanation below, the present invention is a device configured for wireless power transmission between a chassis of a motor vehicle and a cardan shaft which can rotate about an axis of rotation for supplying power to a circuit. Accordingly, the present invention comprises a sleeve coil carrier for fastening to the surface of the cardan shaft, which has an annular section and carries on its body the secondary coil windings; a chassis connection for fastening to the chassis of the motor vehicle and a plate coil carrier which has the primary coil windings which are designed for wireless power transmission to the secondary coil windings located on the sleeve coil carrier; and a power source for supplying the primary coil windings on said plate coil carrier.

[0012] Thus, it has become possible to carry out the assembly of the coil without destroying the cardan shaft and also to make a construction that allows to take measurements from any point on the shaft.

[0013] In a preferred embodiment of the invention, the side of the plate coil carrier facing the sleeve coil carrier is designed in a flat shape.

[0014] In a further preferred embodiment of the invention, the side of the plate coil carrier facing the sleeve coil carrier is designed to be curved on the inside and inclined.

[0015] A further preferred embodiment of the invention includes a primary coil core on the side of the plate coil carrier facing the sleeve coil carrier, on which the primary coil winding is arranged so that it can be wound in order to redirect the magnetic field which is generated in the primary coil winding. The efficiency of the power transmission is thus increased.

[0016] In a further preferred embodiment of the invention, said primary coil core is designed as an annular or elliptical recess.

[0017] In a further preferred embodiment of the invention, said primary coil core is designed as an annular or elliptical elevation.

[0018] A preferred embodiment of the invention includes a secondary coil core on the side of the sleeve coil carrier facing the plate coil carrier, on which the secondary coil winding is arranged so that it can be wound in order to redirect the magnetic field which is generated in the secondary coil winding. The efficiency of the power transmission is thus increased.

[0019] In a further preferred embodiment of the invention, said secondary coil core is designed as an annular or elliptical recess.

[0020] In a further preferred embodiment of the invention, said secondary coil core is designed as an annular or elliptical elevation.

[0021] A preferred embodiment of the invention includes a cover which is designed to protect the surface of the sleeve coil carrier against external influences.

[0022] A preferred embodiment of the invention includes at least one primary connecting arm for connecting the plate coil carrier to the chassis connection and at least one secondary connecting arm which is intended for connection to the chassis connection and is connected to said connecting arm by means of a set screw.

[0023] A further preferred embodiment of the invention includes on the upper

surfaces of the primary and secondary connecting arms at least one adjustment seat provided for changing the overall length by allowing relative movement of the connecting arms against each other.

[0024] A preferred embodiment of the invention includes an adjusting screw on the side surface of the disc reel support for connecting a connecting arm to the adjusting seat to allow vertical movement of the disc reel support.

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 shows an isometric representation of the wireless transmission system according to the invention.

[0026] Figure 1.A shows the embodiment according to Figure 1 in section in a side view.

[0027] Figure 1.B shows an isometric view of the wireless transmission system according to the invention. The cover is not shown in this view.

[0028] Figure 2 shows an isometric view of another embodiment of the wireless transmission system according to the invention.

[0029] Figure 2.A shows the embodiment according to Figure 2 in section in a side view.

[0030] Figure 3 shows an isometric view of an embodiment of the wireless transmission system according to the invention. The cover is not shown in this view.

[0031] Figure 3.A shows an isometric view of an embodiment of the primary and secondary coil carrier.

[0032] The figures are not necessarily to scale and it is possible that details which are not useful for understanding the present invention have been neglected. Furthermore, in the figures, at least largely identical or at least largely functionally identical parts are provided with the same reference symbols. LIST OF REFERENCE SYMBOLS 1. Cardan shaft 2, chassis 10. Plate coil carrier 11. Primary coil core 12. Primary connecting arm 20. Sleeve coil carrier 21. Secondary coil core 22. Cover 30. Chassis connection 31. Secondary connecting arm 32. Connecting body 321. First vertical part 322. Horizontal part 323. Second vertical part 324. Chassis connecting element 33. Bracket

S1. Primary coil windings S2. Secondary coil windings R. Rotation axis

AV. Adjusting screw

AY. Adjustment seat

D. Circuit

DETAILED DESCRIPTION OF THE INVENTION

[0033] In this detailed description, the device for wireless power transmission in cardan shafts 1 is explained merely for better understanding by means of examples which have no limiting effects.

[0034] The invention relates to a device configured for wireless power transmission between the chassis 2 of a motor vehicle and a cardan shaft 1 rotating about an axis of rotation R in order to supply a circuit D with energy and comprises the following:

a sleeve coil carrier 20 having an annular cut for attachment to the cardan shaft 1 and carrying on its body the secondary coil windings S2;

a chassis connection 30 for attachment to the chassis 2 of the motor vehicle and a plate coil carrier 10 having the primary coil windings S1 which are designed for wireless power transmission to the secondary coil windings S2 located on the sleeve coil carrier 20;

a power source for supplying the primary coil windings S1 on said plate coil carrier 10.

[0035] Referring to Figure 1, the cardan shaft 1 is a component that can rotate about a rotation axis R arranged centered under the motor vehicle along a longitudinal axis.

[0036] Different sections of the chassis 2 of the motor vehicle are located around the cardan shaft 1. Depending on the type and model of the motor vehicle, the chassis 2 shown can be provided in forms that differ from the extensions shown.

[0037] A chassis connection 30 is provided at a corresponding point on the chassis 2, and a plate coil carrier 10 is connected to the chassis connection 30. The chassis connection 30 mentioned here can either be a complicated and technically advantageous design, as shown in the figures, or can be designed as screw-like connecting elements that simply connect the plate coil carrier 10 to the chassis 2. Here, the word "plate" in the plate coil carrier 10 must not be perceived as being usable only for flat plates. As mentioned below, other "plate" designs with other geometric shapes can also be used for the device according to the invention.

[0038] A sleeve coil carrier 20 is mounted on the shaft 1. The sleeve coil carrier 20 mentioned here is preferably in the form of a cylindrical sleeve, whereby it can be attached directly to the shaft 1 without additional connecting elements.

[0039] The sleeve coil carrier 20 mentioned can be provided as a one-piece design and can be covered over the shaft 1. In addition, the sleeve coil carrier 20 can also be provided as a two-piece design and can therefore be attached to the shaft 1 by bringing these parts together on the shaft 1.

[0040] Plate coil carrier and sleeve coil carrier 10, 20 each contain the primary and secondary coil windings S1, S2, said coil windings effecting the wireless power transmission by coming into inductive interaction with each other. In addition, the device comprises a power source (not shown in the figures) for supplying the primary coil winding S1 with power.

[0041] Furthermore, in the device, a circuit D provided on the sleeve coil carrier 20 is arranged in such a way that it can be supplied via the secondary coil windings S2. Here, the term circuit D can stand for any electronic device, but can also be used to designate the devices referred to as sensor and measuring part.

[0042] According to Figure 1.A, the secondary coil windings S2 are arranged on the sleeve coil carrier 20. Here, a cover 22 is arranged on the secondary coil windings S2. The cover 22 also preferably has a sleeve shape. The basic task of the cover 22 here is to protect the sleeve coil carrier 20, in particular the secondary coil windings S2 and the circuit D. Since the shaft 1 is provided under the motor vehicle, the aforementioned protective effect is very important from the point of view of the service life of the device.

[0043] The plate coil carrier 10 is arranged as a flat plate which is opposite the shaft 1 on one side. The primary coil windings S1 are arranged on the plate coil carrier 10.

[0044] As can be seen from Figure 1.B, a primary coil core 11 is arranged on the surface of the plate coil carrier 10. Here, the said primary coil core 11 is ring-shaped.

[0045] The primary coil core 11 is designed as an annular recess and the primary coil windings S1 are wound onto this recess. In addition, the primary coil core 11 can similarly be provided as a circular elevation and accordingly the primary coil windings S1 are wound onto this circular elevation.

[0046] The said primary coil core 11 can be provided in addition to the circular geometric shape also in an elliptical geometric shape.

[0047] According to Figures 1.B, 3 and 3.A, secondary coil cores 21 are arranged on the surface of the sleeve coil carrier 20, which are inclined according to the surface. Here, the said secondary coil core 21 is circular.

[0048] The secondary coil core 21 is formed as an annular recess and the secondary coil windings S2 are wound onto this recess. In addition, the secondary coil core 21 can similarly be formed as a circular elevation and accordingly the secondary coil windings S2 are wound onto this circular elevation.

[0049] The said secondary coil core 21 can be provided both circular and elliptical.

[0050] Here, the primary and secondary coil cores 11, 21 provided on the plate coil support and sleeve coil support 10, 20 increase the performance of the wireless power transmission by influencing the direction of the lines of the magnetic field of the primary and secondary coil windings S1, S2 depending on their shape. This results in various advantages both in terms of energy consumption and in terms of increasing the distance between the first and second coil windings S1, S2.

[0051] Another advantageous embodiment is shown in Figure 2. Here, the plate coil carrier 10 influences the direction of the magnetic field of the primary coil windings S1 by being curved on the inside, in particular curved on the inside and inclined. A similar improvement in the performance of the wireless power transmission can also be observed here.

[0052] In addition, an embodiment in which the primary and secondary coil cores 11, 12 are used together with the internally curved inclined plate coil carrier 10, as can be seen from Figure 3, provides a much better performance in terms of wireless power transmission compared to its alternatives.

[0053] According to Figures 1.A and 2.A, the plate coil carrier 10 includes a primary connecting arm 12. In addition, the chassis connection 30 includes a secondary connecting arm 31. The said primary and secondary connecting arms 12, 31 extend towards each other.

the and are positioned next to each other, inside each other or on top of each other.

[0054] There is at least one adjustment seat AY on each of the primary and secondary connecting arms 12, 31. Preferably, several adjustment seats AY are arranged on the two connecting arms. It is also possible to use a slot-shaped adjustment seat AY in each case.

[0055] Here, the position of the plate coil carrier 10 to the shaft 1 is adjusted by moving the primary and secondary connecting arms 12, 31 towards each other, and after the corresponding position is reached, the adjusting screw AV is placed in the corresponding hole and tightened, and the position of the plate coil carrier 10 is fixed. Accordingly, the plate coil carrier 10 can move in the horizontal arrow direction shown in Figure 1.A. The plate coil carrier 10 in which the distance can be adjusted is largely advantageous, especially in test operation.

[0056] Similarly to what is shown in Figure 1.A, vertically arranged adjustment seats AY can be provided on the side surface of the plate coil carrier 10. The adjustment seat AY is connected to one of the connecting arms, preferably to the primary connecting arm 12, by the aforementioned adjusting screws AV. Here, the position of the plate coil carrier 10 is adjusted by moving it in the direction of the arrow shown in Figure 1.A.

[0057] In a preferred embodiment of the invention, the chassis connection 30 is arranged on a connecting body 32. Preferably, a bracket 33 is positioned between the connecting body 32 and the chassis 2. Here, the connecting body 32 is placed in the front part of the chassis 2. At the end of a first vertical part 321 that protrudes from the connecting body 32, a horizontal part 322 is provided. At the end of the horizontal part 322, a second vertical part 323 is provided. Here, the second vertical part 323 is located at the rear part of the chassis 2. A chassis connecting element 324 connects the chassis connection 30 to the chassis 2 by passing through the first vertical part 321, the chassis 2 and the connecting body 32.

[0058] The scope of the invention is expressed in the appended claims and is not limited to the examples mentioned in this detailed description, since it is clear that a person skilled in the art can, based on the explanations given above, provide similar embodiments without departing from the main subject of the invention.

Claims (13)

Expectations 1. The invention relates to a device configured for wireless power transmission between a chassis (2) of a motor vehicle and a cardan shaft (1) which can rotate about an axis of rotation (R) in order to supply energy to a circuit (D), characterized in that it comprises: a sleeve coil support (20) for fastening to the surface of the cardan shaft (1), which has an annular section and carries on its body the secondary coil windings (S2); a chassis connection (30) for fastening to the chassis (2) of the motor vehicle and a plate coil support (10) which has the primary coil windings (S1) which are designed for wireless power transmission to the secondary coil windings (S2) located on the sleeve coil support (20); a power source for supplying the primary coil windings (S1) on said plate coil support (10). 2. Device according to claim 1, characterized in that the side of the plate coil carrier (10) directed towards the sleeve coil carrier (20) is designed in a flat shape. 3. Device according to claim 1, characterized in that the side of the plate coil carrier (10) directed towards the sleeve coil carrier (20) is designed in an inwardly curved, inclined shape. 4. Device according to one of the preceding claims, characterized in that the plate coil carrier (10) has, on its side directed towards the sleeve coil carrier (20), a primary coil core (11) which is provided for redirecting the magnetic field which arises on the primary coil winding (S1) and is designed to be wound around the primary coil winding (S1). 5. Device according to claim 4, characterized in that said primary coil core (11) is formed as a circular or elliptical recess. 6. Device according to claim 4, characterized in that said primary coil core (11) is designed as a circular or elliptical elevation. 7. Device according to one of the preceding claims, characterized in that the sleeve coil carrier (20) has on its surface at least one secondary coil core (21) which is provided for redirecting the magnetic field which arises on the secondary coil winding (S2) and is designed to be wound around by the secondary coil winding (S2). 8. Device according to claim 7, characterized in that said secondary coil core (21) is formed as a circular or elliptical recess. 9. Device according to claim 7, characterized in that said secondary coil core (21) is provided as a circular or elliptical elevation. 10. Device according to one of the preceding claims, characterized in that the sleeve coil carrier (20) includes a cover (22) for protecting its surface against external influences. 11. Device according to claim 1, characterized in that it comprises at least one primary connecting arm (12) for connecting the coil carrier (10) to the chassis connection (30) and at least one secondary connecting arm (31) which is connected to the chassis connection (30) and can be connected to said connecting arm (12) by an adjusting screw (AV). 12. Device according to claim 11, characterized in that the primary and secondary connecting arms (12, 31) each include on their surfaces at least one adjustment seat (AY) intended to allow a variation of the overall length by allowing the relative movement of the connecting arms to each other. 13. Device according to claims 1 and 12, characterized in that the plate coil carrier (10) includes on its lateral surface at least one adjustment seat (AY) which allows the vertical movement of the plate coil carrier (10) and has an adjusting screw (AV) which is designed to connect the adjustment seat (AY) to one of the connecting arms. 7 sheets of drawings 7 FIGURE 1