FUEL PUMP AND VEHICLE

Abstract

electric motor, fuel pump and vehicle. The present invention relates to an electric motor (23) for a fuel pump (22), wherein the electric motor (23) has a stator (24) and / or a rotor (25), which are made of a ferritic steel alloy. In addition, the invention relates to a fuel pump (22) with such electric motor (23) and to a vehicle (21) with such fuel pump (22) and / or with such electric motor (23).

Description

1 / 8 Descriptive Report of the Invention Patent for FUEL PUMP AND VEHICLE. Technical Field

[001] The present invention relates to an electric motor. The invention also relates to a fuel pump. In addition, the invention relates to a vehicle. State of the Art

[002] Electric motors for fuel pumps of the state of the art tend to corrode when transporting fuels with a high ethanol content, especially in the case of a 100 percent ethanol content, and, therefore, the components of the electric motors that come into contact with the fuel, such as stators and rotors, have a corrosion-resistant protective coating or an overmolding of synthetic material resistant to ethanol.

[003] One disadvantage of state-of-the-art electric motors is, in particular, the expensive coating or overmolding. Description of the invention, its purpose, solution, and advantages.

[004] Therefore, the objective of the present invention is to create an alternative electric motor, which is distinguished, in particular, by a high resistance to corrosion in relation to fuel containing ethanol and / or methanol or in relation to fuels with a 100 percent ethanol and / or methanol content. Furthermore, another objective is to provide a fuel pump with such an electric motor. In addition, another objective is to provide a vehicle with such a fuel pump and / or such an electric motor.

[005] The objective relating to the electric motor is achieved by means of an electric motor with the characteristics presented in claim 1.

[006] An example of an embodiment of the invention relates to a motor. Petition 870240091259, dated 10 / 25 / 2024, page 7 / 31 2 / 8 electric motor for a fuel pump, wherein the electric motor has a stator and / or a rotor, which are produced or are produced from a ferritic steel alloy. In other words, it is conceivable that the stator, the rotor, or the rotor and the stator are produced or are produced from a ferritic steel alloy. This means that the stator, the rotor, or the rotor and the stator are made predominantly or entirely of a ferritic steel alloy.

[007] It is advantageous for the ferritic steel alloy to be corrosion resistant. Corrosion resistance means, especially, resistance to corrosion with respect to fuel containing methanol and / or ethanol. In this case, this means, especially, fuels with at least 50%, 90% ethanol content and / or methanol content. Alternatively, this is understood, spatially, as a fuel that is 100% ethanol and / or methanol.

[008] It is particularly advantageous that in the case of the steel alloy it is a refined alloy steel, especially a refined alloy steel of the stainless steel type with special additives, according to the Stahlinstitut VDEh institute based in the Federal Republic of Germany.

[009] It is also advantageous that in the case of the stator it is a stack of stator laminations. On the other hand, in the case of the rotor it is advantageously a stack of rotor laminations. Preferably, the rotor has permanent magnets on or under its surface.

[0010] A precedent embodiment or a preferred embodiment is characterized by the fact that the stator and / or rotor are configured or are configured without coating. In other words, the stator, rotor, or rotor and stator are configured without coating or overmolding. This makes it possible to dispense with costly coating or overmolding, which reduces manufacturing effort and consequently production costs. Petition 870240091259, dated 10 / 25 / 2024, p. 8 / 31 3 / 8

[0011] One of the preceding embodiments or another preferred embodiment is characterized by the fact that the steel alloy includes at most 0.1% Ni and / or at most 0.1% C. This reduces or prevents the formation of an austenitic phase in the steel alloy.

[0012] It is also preferable that the steel alloy contains at most 0.1% of Ni and C. This means that the combined fractions of Ni and C correspond to a maximum of 0.1%.

[0013] One of the preceding embodiments or another preferred embodiment is characterized by the fact that the steel alloy includes at least 8% Cr. It is particularly preferred that the steel alloy includes at least 16% Cr. In this way, an advantageous ferritic phase is created.

[0014] One of the preceding embodiments or another preferred embodiment is characterized by the fact that it includes Ti and / or Nb. In this way, sufficient corrosion resistance against intergranular corrosion is obtained.

[0015] One of the preceding embodiments or another preferred embodiment is characterized by the fact that in the case of the steel alloy it is material 1.4511 or 1.4512. In this case, it is a standardized material commonly found on the market and therefore relatively inexpensive. The numbers correspond to the material number as indicated by the Stahlinstitut VDEh based in the Federal Republic of Germany. Alternatively, the rotor can be produced from one of the two materials, while the stator can be produced from the other material.

[0016] One of the preceding embodiments or another preferred embodiment is characterized by the fact that the stator is configured with a greater stator tooth width compared to a reference stator, produced from material 1.4003, such that a lower permeability of the stator compared to the reference stator is compensated for at least Petition 870240091259, dated 10 / 25 / 2024, page 9 / 31 4 / 8 partially. Stator tooth width is the width of a stator tooth on a stator, measured in the peripheral direction of the stator. In other words, stator tooth width is measured perpendicular to the direction of extension of the stator tooth. Specifically, the stator and the reference stator have the same winding type, the same outer diameter, and / or the same length.

[0017] It is also preferable that the permeability of the steel alloy be at least 550. Due to the increased tooth width, it becomes possible to partially compensate for the lower permeability compared to material 1.4003. The permeability of material 1.4003 is around 2000. For compensation, higher phase currents are indeed necessary, although this is accepted here to ensure corrosion resistance to ethanol and / or methanol. In addition, the space between the stator teeth, in which the windings are housed, is reduced.

[0018] One of the preceding embodiments or another preferred embodiment is characterized by the fact that it has a concentrated winding or a distributed winding. While a distributed winding contributes to a uniform electromagnetic rotation field, a concentrated winding can be manufactured extremely easily, especially when the stator is configured as a segmented stator, which is conceivable.

[0019] One of the preceding embodiments or another preferred embodiment is characterized by the fact that the electric motor is configured as a permanently excited synchronous machine or as a mechanically commutated DC motor. When the electric motor is configured as a permanently excited synchronous machine, i.e., as a Brushless DC motor, it will be an electric motor with a lifetime. Petition 870240091259, dated 10 / 25 / 2024, page 10 / 31 5 / 8 particularly high. On the other hand, when the electric motor is configured as a mechanically commutated DC motor, it will be a particularly inexpensive electric motor. It is also preferable that the electric motor be configured as an internal rotor, regardless of the type of electric motor involved.

[0020] The objective relating to the fuel pump is achieved by means of a fuel pump with the characteristics presented in claim 10. In other words, a fuel pump with an electric motor according to the invention is made available. In this way, a fuel pump is generated that is particularly resistant to corrosion with respect to fuels containing ethanol and containing methanol.

[0021] The objective relating to the vehicle is achieved by means of a vehicle with the characteristics presented in claim 11. In other words, a vehicle is made available with an electric motor according to the invention and / or with a fuel pump according to the invention. In this way, a vehicle is created that is particularly wear-resistant and corrosion-resistant.

[0022] Também é preferível que no caso do veículo se trate de um veículo automotor, um automóvel de passeio ou um caminhão. No caso do veículo, também se pode tratar de uma motocicleta ou, em geral, de um veículo de duas rodas motorizado.

[0023] In the context of disclosing the invention, basically all percentage indices are mass percentages.

[0024] In addition, it is desirable that the steel alloy be basically resistant to ethanol, resistant to methanol, and resistant to corrosion with respect to fuels containing ethanol and / or containing methanol. With regard to fuels containing ethanol or containing methanol, this especially refers to a fuel with a high ethanol content or methanol content, of at least 50%, 80%, 95%. Petition 870240091259, dated 10 / 25 / 2024, page 11 / 31 6 / 8 or 99%. Alternatively, in the case of fuel, it could be pure ethanol or pure methanol, or a mixture of both, which together make up the percentage fractions of the fuel mentioned above.

[0025] Advantageous ways of developing the present invention are described in the dependent claims and in the subsequent description of the figures.

[0026] As part of the disclosure of the invention, the abbreviation Cr refers specifically to chromium. As part of the disclosure of the invention, the abbreviation C refers specifically to carbon. As part of the disclosure of the invention, the abbreviation Ti refers specifically to titanium. In the context of the disclosure of the invention, the abbreviation Nb refers specifically to niobium. As part of the disclosure of the invention, the abbreviation Ni refers specifically to nickel.

[0027] Corrosion resistance with respect to fuel containing ethanol and / or containing methanol means that no reaction occurs between the steel alloy of claim 1 and fuel containing ethanol and / or containing methanol that produces a measurable alteration of the material. Because of this, there is no impairment to the function of the stator and / or rotor or fuel pump or vehicle. Brief Description of the Drawings

[0028] The invention will now be explained in detail based on embodiments, with reference to the drawings. The drawings show:

[0029] Figure 1: a state-of-the-art vehicle and

[0030] Figure 2: a vehicle according to the invention. Preferred Embodiment of the Invention

[0031] Figure 1 shows a prior art vehicle 11 with a prior art fuel pump 12 and an engine. Petition 870240091259, dated 10 / 25 / 2024, page 12 / 31 7 / 8 electric motor 13 of the prior art. The electric motor 13 has a stator 14 and a rotor 15, which are made of material 1.4003, a steel alloy. This stator 14 is a reference stator, which serves as a comparison between the electric motor according to the invention and the stator presented therein. In addition, the stator 14 has stator teeth 17, which have a stator tooth width 18 and support the winding 16.

[0032] Figure 2 shows a vehicle 21 according to the invention, with a fuel pump 22 according to the invention and with an electric motor 23 according to the invention. The electric motor 23 is a permanently excited synchronous machine, which is configured as an internal rotor. The electric motor has a stator 24 and a rotor 25, which are produced from material 1.4511, of a steel alloy. Alternatively, the rotor and stator can be produced from material 1.4512, also of a steel alloy. Alternatively, the rotor 25 can be produced from one of the two materials, while the stator 24 can be produced from the other material. Furthermore, the electric motor 23 has a winding 26 which is configured as a concentrated winding. It can be seen that the stator teeth 27 of stator 24 have a stator tooth width 28 greater than the stator teeth of the stator in Figure 1, that is, the reference stator.Because of this, the lower permeability compared to the reference stator is compensated for, at the cost of less space for windings 26 between the stator teeth 27. This requires particularly high phase currents.

[0033] The embodiment in figure 2 does not present, in particular, any restrictive feature and serves to illustrate the concept of the invention. LIST OF VEHICLE REFERENCE NUMBERS Petition 870240091259, dated 10 / 25 / 2024, page 13 / 31 8 / 8 fuel pump electric motor stator rotor winding stator tooth stator tooth width vehicle fuel pump electric motor stator rotor winding stator tooth stator tooth width Petition 870240091259, dated 10 / 25 / 2024, page 14 / 31

Claims

1 / 2 CLAIMS 1. Fuel pump (22) comprising an electric motor (23), wherein the electric motor (23) has a stator (24) made of a ferritic steel alloy, characterized in that the steel alloy is of material 1.4511 or 1.4512, and that the stator (24) is configured with a larger stator tooth width compared with a reference stator (14) made of material 1.4003, in such a way that a lower permeability of the stator (24) compared with the reference stator (14) is at least partially compensated.

2. Fuel pump (22), according to claim 1, characterized in that the stator (24) and / or rotor (25) are configured or is configured without coating or without overmolding.

3. Fuel pump (22), according to claim 1 or 2, characterized in that the steel alloy includes at most 0.1% Ni and / or at most 0.1% C.

4. Fuel pump (22), according to any of the preceding claims, characterized in that the steel alloy includes at least 8% Cr.

5. Fuel pump (22), according to any of the preceding claims, characterized in that the steel alloy includes Ti and / or Nb.

6. Fuel pump (22), according to any of the preceding claims, characterized in that the stator (24) has a concentrated winding or a distributed winding (26).

7. Fuel pump (22), according to any of the preceding claims, characterized in that the electric motor (23) is configured as a permanently excited synchronous machine or as a mechanically commutated direct current motor.

8. Vehicle (21), characterized in that it comprises a fuel pump (22), as defined in any one of claims 1 to 7. Petition 870240091259, dated 10 / 25 / 2024, page 16 / 31

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