High-pressure cleaning device

Abstract

High pressure cleaning device including: - a connection (2) for a liquid source (3), - a high pressure pump (4), - a main line (5) through which liquid can be conveyed from the connection (2) to an ejection opening (6) of the main line (5) by means of the high-pressure pump (4), and - a first electric motor (10) for driving the high-pressure pump (4), wherein the first electric motor (10) generates a first power, characterized in that the high-pressure cleaning device (1) comprises a second electric motor (20) for driving the high-pressure pump (4), wherein the second electric motor (20) generates a second power, that the high-pressure cleaning device (1) comprises a gearbox (30), that the gearbox (30) comprises an output shaft (31) for driving the high-pressure pump (4), and that the gearbox (30) is designed such that the first power and the second power can be used simultaneously to drive the output shaft (31) of the gearbox (30).

Description

[0001] The invention relates to a high-pressure cleaning device according to the preamble of claim 1.

[0002] The high-pressure pump of a pressure washer is typically powered by an electric motor. Pressure washer devices are typically corded. The electric motor receives its electrical energy from an external power source, such as a public power grid. The available power from the public power grid varies from country to country. In the German power grid, for example, the available power is approximately 3.5 kW. In the US power grid, it is comparatively lower at approximately 1.9 kW. The peak power of the high-pressure pump or electric motor therefore varies depending on the power available in the public power grid.

[0003] From DE 197 26 794 A1 a high-pressure cleaning device with an electric drive motor that drives an internal gear pump is known.

[0004] CN 204 672 602 U discloses a high-pressure cleaning device with a main pump for generating high pressure and an auxiliary pump for generating a high flow rate. The main pump is driven by a main motor, and the auxiliary pump is driven by an auxiliary motor. The outlet line of the main pump and the outlet line of the auxiliary pump are connected to a discharge opening via a T-piece.

[0005] The invention is based on the object of developing a generic high-pressure cleaning device in such a way that the peak performance of the high-pressure pump can be achieved even with lower available power from a public power grid.

[0006] This object is achieved by a high-pressure cleaning device having the features of claim 1.

[0007] According to the invention, a first electric motor is provided to drive the high-pressure pump. The first electric motor generates a first power. In particular, the first electric motor generates a first torque. In addition to the first electric motor, a second electric motor is provided. The second electric motor also serves to drive the high-pressure pump. The second electric motor generates a second power. In particular, the second electric motor generates a second torque.

[0008] According to the invention, the high-pressure cleaning device comprises a transmission. The transmission comprises an output shaft for driving the high-pressure pump. In particular, the output shaft is directly connected to the high-pressure pump. The core of the invention lies in the fact that the transmission is designed such that the first power provided by the first electric motor and the second power provided by the second electric motor can be used simultaneously to drive the output shaft of the transmission. In particular, the transmission is designed such that the first torque provided by the first electric motor and the second torque provided by the second electric motor can be used simultaneously to drive the output shaft of the transmission.

[0009] In particular, the first power of the first electric motor and the second power of the second electric motor are transmitted to the single output shaft of the transmission. As a result, the first power and the second power are combined. In particular, the first torque of the first electric motor and the second torque of the second electric motor can be used simultaneously to drive the output shaft of the transmission. In particular, the first torque and the second torque can simultaneously contribute to driving the output shaft. In particular, the torque of the output shaft is greater than the first torque. In particular, the torque of the output shaft is greater than the second torque. In particular, the power provided by the output shaft is greater than the first power of the first electric motor alone. In particular, the power provided by the output shaft is greater than the second power of the second electric motor alone.

[0010] In particular, the torque of the output shaft is less than the sum of the first torque and the second torque. In particular, the power provided by the output shaft is less than the sum of the first power and the second power.

[0011] In particular, the transmission adds the first power and the second power, in particular the first torque and the second torque.

[0012] Because a transmission is provided according to the invention through which the first power and the second power can be used simultaneously to drive the output shaft of the transmission, when the high-pressure cleaning device is operated with a peak power of the high-pressure pump, in particular in boost mode of the high-pressure cleaning device, both the first electric motor and the second electric motor can contribute simultaneously to driving the output shaft. If the first electric motor is operated with an energy source whose power is below the otherwise usual power, the second electric motor can compensate for this power difference. This makes it possible, within certain limits, to operate the high-pressure pump at a peak power regardless of the power available to the first electric motor.

[0013] Because the first electric motor and the second electric motor can be used simultaneously to drive the output shaft, the high-pressure cleaning device remains operational even if one of the two electric motors or another component of the associated drive train fails. Because the first power of the first electric motor and the second power of the second electric motor are mechanically transmitted to the output shaft via a gearbox, the two electric motors can be supplied with electrical power by completely separate electrical systems. The two electrical systems do not influence each other. This results in good electromagnetic compatibility.

[0014] The first electric motor is preferably an alternating current motor. In particular, the first electric motor is a universal motor.

[0015] The second electric motor is expediently a DC motor. In particular, the second electric motor is a brushless DC motor. In particular, the second electric motor is an electronically commutated motor.

[0016] The high-pressure cleaning device is expediently designed such that the first electric motor can be operated by means of an external energy source. In particular, the high-pressure cleaning device is designed such that the first electric motor can be operated by means of an alternating voltage, in particular by means of the mains voltage.

[0017] In a suitable development of the invention, the high-pressure cleaning device comprises an electrical energy source. In particular, the electrical energy source is a rechargeable battery or a battery. In particular, the high-pressure cleaning device is designed so that the second electric motor can be supplied with electrical energy by the electrical energy source. This allows a power difference, for example, due to a lower mains power used to operate the first electric motor, to be compensated for by the second electric motor.

[0018] Because the transmission is designed so that the first and second power can be used simultaneously to drive the transmission's output shaft, several options for driving the output shaft are available. The high-pressure cleaner is more flexible overall.

[0019] In a particular development of the invention, the transmission is designed such that the output shaft can be driven either simultaneously by the first electric motor and the second electric motor, in particular with the first power and the second power, in particular with the first torque and the second torque, or exclusively by either the first electric motor or the second electric motor, in particular exclusively with either the first power or the second power, in particular exclusively with either the first torque or the second torque. As a result, the second electric motor can, for example, only be switched on in situations where it is necessary. It is also conceivable for the high-pressure pump to be powered by only a single energy source, for example the battery or a public power grid.This enables flexible use of the high-pressure cleaning device, for example, even away from a public power grid.

[0020] In particular, the transmission includes at least one freewheel. When the output shaft is driven by only one of the two electric motors, the freewheel effectively prevents power transmission, in particular torque transmission, from the electric motor used for drive to the other electric motor. This prevents unintentional energy loss. Furthermore, it allows the high-pressure pump to be operated with only one of the two electric motors.

[0021] For practical purposes, the first electric motor and the second electric motor are completely electrically separated from each other. This creates reliable redundancy between the two drive trains and prevents mutual interference between the two energy sources. The energy source of the first electric motor cannot interfere with the energy source of the second electric motor. Conversely, the energy source of the second electric motor cannot interfere with the energy source of the first electric motor. This ensures good electromagnetic compatibility.

[0022] In particular, the transmission has a single output shaft.

[0023] The gear unit is preferably a planetary gear unit. Specifically, the planetary gear unit comprises a sun gear, a ring gear, and planetary gears.

[0024] The high-pressure cleaning device is expediently designed such that the sun gear can be driven by one of the two electric motors and the ring gear can be driven by the other of the two electric motors. In particular, the high-pressure cleaning device is designed such that the sun gear can be driven by the first electric motor and the ring gear can be driven by the second electric motor. The high-pressure cleaning device is expediently designed such that the output shaft can be driven by the planetary gears driven by the sun gear and / or the ring gear. In particular, the output shaft is rotatable about a rotational axis to drive the high-pressure pump. In particular, the planetary gears can be driven by the sun gear and / or the ring gear to rotate about the rotational axis.

[0025] The ring gear expediently has external teeth on its outer circumference and internal teeth on its inner circumference. In particular, the power, in particular the torque, in particular the force of one electric motor, in particular the second electric motor, is transmitted to the ring gear via the external teeth. In particular, the torque of the ring gear is transmitted from the ring gear to the planetary gears via the internal teeth.

[0026] An embodiment of the invention is explained below with reference to the drawings. They show: Fig. 1 a perspective, schematic representation of a high-pressure cleaning device, Fig. 2 a schematic sketch of the structure of the high-pressure cleaning device from Fig. 1, Fig. 3 a perspective, schematic representation of the two electric motors, the gearbox and the high-pressure pump of the high-pressure cleaning device from the Fig. 1 and Fig. 2, Fig. 4 a sectional view of a horizontal section through the arrangement of Fig. 3 and Fig. 5 a sectional view of a section along the section line VV from Fig. 4.

[0027] Fig. Figure 1 shows a high-pressure cleaning device 1. The high-pressure cleaning device 1 is designed for cleaning objects with pressurized cleaning fluid. In the exemplary embodiment, the high-pressure cleaning device 1 is pushable. However, it can also be provided that the high-pressure cleaning device 1 is portable. During normal operation, the high-pressure cleaning device 1 is parked. In the exemplary embodiment, the high-pressure cleaning device 1 is a cold water high-pressure cleaner.

[0028] As in Fig. As shown in Figure 2, the high-pressure cleaning device 1 includes a connection 2 for a fluid source 3. In the exemplary embodiment, the fluid source 3 is an external fluid source. In the exemplary embodiment, the external fluid source is the faucet of a domestic water supply. It can also be provided that the fluid source is an integral part of the high-pressure cleaning device.

[0029] The high-pressure cleaning device 1 comprises an ejection opening 6. The high-pressure cleaning device 1 comprises a main line 5. The main line 5 of the high-pressure cleaning device 1 fluidically connects the connection 2 to the ejection opening 6. In the exemplary embodiment, the ejection opening 6 is arranged on an ejection unit. The ejection unit is designed, in particular, as a gun. It can also be provided that the ejection opening is arranged on a replaceable lance of the ejection unit.

[0030] The high-pressure cleaning device 1 comprises a high-pressure pump 4. By means of the high-pressure pump 4, liquid can be conveyed through the main line 5 from the connection 2 to the ejection opening 6. The liquid source 3 is fluidically connected to the main line 5. The high-pressure pump 4 is arranged in the main line 5. The high-pressure pump 4 pressurizes the liquid. By means of the high-pressure pump 4, the cleaning liquid can be pressurized to a pressure of at least 10 bar, in particular of at least 15 bar, in particular of at least 30 bar, in particular of at least 100 bar. In particular, the high-pressure pump 4 can pressurize the cleaning liquid to a maximum of 600 bar, in particular of at most 500 bar. In the exemplary embodiment, the high-pressure pump 4 comprises a swash plate, as shown in Fig. 4 shown.

[0031] The high-pressure cleaning device 1 has a housing 7 ( Fig. 3). The high-pressure pump 4 is arranged in the housing 7. The main line 5 is arranged at least partially in the housing 7. The injection unit is arranged outside the housing 7. The injection unit is connected to the housing via the main line 5.

[0032] The high-pressure cleaning device 1 comprises a gearbox 30. The gearbox 30 has an output shaft 31. The gearbox 30 has a gearbox housing 37. The gearbox 30 is arranged in the housing 7 of the high-pressure cleaning device 1. The output shaft 31 drives the high-pressure pump 4. The output shaft 31 protrudes from the gearbox housing 37 of the gearbox 30. The output shaft 31 is connected to the high-pressure pump 4. In the exemplary embodiment, the output shaft 31 is connected to the high-pressure pump 4 in such a way that rotation of the output shaft 31 causes rotation of the swash plate of the high-pressure pump 4. The gearbox 30 has only a single output shaft 31.

[0033] As in Fig. 3, the high-pressure cleaning device 1 comprises a first electric motor 10. The high-pressure cleaning device 1 comprises a second electric motor 20. The first electric motor 10 is designed separately from the second electric motor 20. The first electric motor 10 and the second electric motor 20 are completely electrically separated from one another. The first electric motor 10 generates a first power. The first electric motor 10 generates, in particular, a first torque. The second electric motor 20 generates a second power. The second electric motor 20 generates, in particular, a second torque. The transmission 30 is designed such that the first power and the second power can be used simultaneously to drive the output shaft 31 of the transmission 30. In particular, the transmission 30 is designed such that the first torque and the second torque can be used simultaneously to drive the output shaft 31 of the transmission 30.

[0034] The power generated by the first electric motor 10 is mechanically transmitted to the output shaft 31 by means of the transmission 30. In particular, the first torque generated by the first electric motor 10 is mechanically transmitted to the output shaft 31 by means of the transmission 30. The power generated by the second electric motor 20 is mechanically transmitted to the output shaft 31 by means of the transmission 30. In particular, the second torque generated by the second electric motor is mechanically transmitted to the output shaft 31 by means of the transmission 30.

[0035] The power and torque of electric motors 10 and 20 are proportional to each other. The product of torque and speed determines the generated power.

[0036] The transmission 30 is designed such that the output shaft 31 can optionally be driven simultaneously with the first power and the second power or can be driven exclusively with one of the two powers. In particular, the transmission 30 is designed such that the output shaft 31 can optionally be driven simultaneously with the first torque and the second torque or can be driven exclusively with one of the two torques. In the exemplary embodiment, the transmission is designed such that the first power of the first electric motor 10 and the second power of the second electric motor 20 are used simultaneously by the transmission 30 to generate a total power. The total power is greater than the first power. The total power is greater than the second power. The total power is less than or equal to the sum of the first power and the second power.In particular, the transmission is designed such that the first torque and the second torque interact to generate a total torque. The total torque is greater than the first torque. The total torque is greater than the second torque. The total torque is less than or equal to the sum of the first torque and the second torque.

[0037] The total power is the power with which the output shaft 31 drives the high-pressure pump 4. The total torque is the torque with which the output shaft 31 drives the high-pressure pump 4.

[0038] The Fig. The first electric motor 10 shown in Figure 3 is an alternating current motor. In the exemplary embodiment, the first electric motor 10 is a universal motor. A universal motor is a single-phase series-wound motor. A universal motor can be operated with both direct and alternating current. A universal motor can also be referred to as a single-phase commutator motor. The universal motor comprises a fixed part, the stator, and a moving part, the rotor. The magnetic field in both the rotor and the stator is generated by current-carrying coils. The rotors have mechanical commutation. For this purpose, sliding contacts are generally provided which interact with brushes, in particular carbon brushes. The sliding contacts are arranged such that they change the polarity of the armature winding during rotation such that current always flows through the winding that moves perpendicular to the excitation field.The commutator, together with the brushes, acts as a mechanical switch. The commutator ensures that the current flow through the rotor coils reverses precisely when the south pole of the rotor and the north pole of the stator are close together. With the reversal of the current direction, the rotor's magnetic poles also reverse.

[0039] The second electric motor 20 is a DC motor. In particular, the second electric motor 20 is a brushless DC motor. Most notably, the second electric motor is an electronically commutated motor. The electronically commutated motor is also referred to as an EC motor. In this motor, control electronics convert the DC current into a suitable three-phase current. The three-phase winding is controlled by a suitable circuit to generate a moving magnetic field that pulls the rotor along.

[0040] The high-pressure cleaning device 1 is designed such that the first electric motor 10 can be operated using an external energy source. In particular, the electric motor 10 can be operated using an alternating voltage. In particular, the first electric motor 10 can be operated using the mains voltage. The mains voltage is the voltage provided by a public power grid. The mains voltage is the electrical voltage provided by energy suppliers in the power grids, which is used to transmit electrical energy. The mains voltage can have different properties in different countries. In Europe, the mains voltage is 230 V ± 23 V at a mains frequency of 50 Hz ± 0.2 Hz. In Canada, the USA, Mexico, and some northern states of South America, the nominal value of the alternating mains voltage is 120 V. The mains frequency is 60 Hz.

[0041] As in Fig. 3, the high-pressure cleaning device 1 comprises an electrical energy source 21. The electrical energy source 21 serves to supply the second electric motor 20 with electrical energy. The electrical energy source 21 is arranged in or on the Fig. 2. The electrical energy source 21 is, in particular, replaceable. In the exemplary embodiment, the electrical energy source 21 is a rechargeable battery. However, it can also be provided that the electrical energy source 21 is a battery. The high-pressure cleaning device 1 is designed to supply the second electric motor 20 with electrical energy via the electrical energy source 21. The electrical energy source 21 is a direct current source. In the exemplary embodiment, the electrical energy source 21 has a nominal voltage in the range from 10 V to 80 V, in particular from 18 V to 72 V, most particularly from 30 V to 40 V.

[0042] As in Fig. 4, the transmission 30 comprises at least one freewheel 32, 33. The at least one freewheel 32, 33 prevents power transmission, in particular torque transmission, from the electric motor 10, 20 used for drive to the other electric motor 10, 20 when the output shaft 31 is driven by only one of the two electric motors 10, 20. In the exemplary embodiment, a first freewheel 32 is provided. The first freewheel 32 prevents power transmission, in particular torque transmission, from the second electric motor 20 to the first electric motor 10. In the exemplary embodiment, a second freewheel 33 is provided. The second freewheel 33 prevents power transmission, in particular torque transmission, from the first electric motor 10 to the second electric motor 20. The freewheel 32, 33 blocks the transmission of torque that would drive the motor shaft of the electric motor 10, 20 in a specific direction.

[0043] Gear 30 is a planetary gear. Planetary gears are also known as epicyclic gears. Planetary gears are gear or friction gears that, in addition to frame-mounted shafts, also have axes that rotate on circular paths within the frame. Accordingly, a distinction is made between the central or sun gears mounted on the frame-mounted axes and the epicyclic or planet gears mounted on the orbiting axes. The gears rotating on the orbiting axes orbit a central gear, much like planets orbit the sun. The carrier, which supports the orbiting axes, in turn rotates around an axis fixed to the frame.

[0044] In the exemplary embodiment, the output shaft 31 is fixed to this web. The planetary gear in the exemplary embodiment is a gear transmission. As in Fig. 5, the gear 31 comprises a sun gear 34, a ring gear 35, and planet gears 36. The high-pressure cleaning device 1 is designed such that one of the two electric motors 10, 20 can drive the sun gear 34 and the other of the two electric motors 10, 20 can drive the ring gear 35. In the exemplary embodiment, the sun gear 34 can be driven by the first electric motor 10 and the ring gear 35 can be driven by the second electric motor 20. The high-pressure cleaning device 1 is designed such that the output shaft 31 can be driven by the planet gears 36. The planet gears 36 are driven by the sun gear 34 and / or the ring gear 35. The output shaft 31 can be rotated about a rotation axis 50 to drive the high-pressure pump 1. The planet gears 36 can be driven to rotate about the rotation axis 50. The planet gears 36 can be driven by the sun gear 34 and / or the ring gear 35 to rotate around the rotation axis 50.The planet gears 36 can be driven either by the sun gear 34 or by the ring gear 35 or by both the sun gear 34 and the ring gear 35.

[0045] The gear 30 comprises a web 38. The web 38 is a plate in the exemplary embodiment. The web 38 has the shape of a flat cylinder in the exemplary embodiment. However, other shapes for the web 38 are also possible. For example, the web 38 can be star-shaped. The web 38 is connected to each planetary gear 36 via a planetary shaft 39, as also in Fig.4. The carrier is also referred to as a planet carrier. In the exemplary embodiment, a total of three planet gears 36 are provided. The three planet gears 36 are arranged at an angular distance of 120° from one another with respect to the rotational axis 50. These angular distances remain as the planet gears 36 revolve around the rotational axis 50. In the exemplary embodiment, the planet gear 36 is rotatably mounted on the planetary shaft 39. The carrier 38 is connected in a rotationally fixed manner to the output shaft 31. The output shaft 31 runs coaxially to the rotational axis 50. When the planet gears 36 rotate, the carrier 38 and thus also the output shaft 31 rotate around the rotational axis 50.

[0046] The sun gear 34 can be set in rotation by means of the first electric motor 10. The sun gear 34 is connected to the motor shaft of the first electric motor 10 via a sun shaft 40 and a corresponding gear. The gears between the sun shaft 40 and the motor shaft of the first electric motor 10 represent a first gear ratio pre-stage. The first gear ratio pre-stage serves to reduce the speed of the sun shaft 40 compared to the speed of the first electric motor 10.

[0047] At a bearing point opposite the sun gear 34, the sun shaft 40 is mounted in the housing 7 via the first freewheel 33. The first freewheel 32 only permits rotation of the sun shaft 40 in one direction. In the other direction, the first freewheel 32 prevents rotation of the sun shaft 40. When the high-pressure pump 4 is driven exclusively by the second electric motor 20, the first freewheel 32 provides a counter-torque that prevents rotation of the sun gear 34 and the sun shaft 40. The planet gears 36 can then rotate on the stationary sun gear 34 about the rotation axis 50. By locking the first freewheel 32, the transmission of the second power, in particular the second torque, from the second electric motor 20 to the output shaft 31 by means of the transmission 30 is possible.

[0048] The transmission 30 comprises a ring gear drive shaft 41. In the exemplary embodiment, the ring gear drive shaft 41 runs coaxially with the motor shaft of the second electric motor 20. The ring gear drive shaft runs offset from the rotational axis 50. The ring gear drive shaft 41 runs parallel to the rotational axis 50. The ring gear 35 can be driven by the second electric motor 20 via the ring gear drive shaft 41. The ring gear 35 is pot-shaped in the exemplary embodiment. In the exemplary embodiment, the ring gear 35 is rotatably mounted on the sun shaft 40. The ring gear 35 has external teeth on its outer circumference. By means of a corresponding gear on the ring gear drive shaft 41, the second power, in particular the second torque, is transmitted from the second electric motor 40 to the ring gear 35. The external teeth of the ring gear 35 and the gear on the ring gear drive shaft 41 represent a second transmission pre-stage.The second gear ratio pre-stage serves to reduce the speed of the ring gear drive shaft 41 compared to the speed of the second electric motor 20.

[0049] The ring gear drive shaft is mounted in the housing 7 at its longitudinal end facing away from the second electric motor 20 by means of the freewheel 33. The second freewheel 33 only permits rotation of the ring gear drive shaft 41 in one direction of rotation. The second freewheel 33 blocks the ring gear drive shaft 41 in the other direction of rotation. When the output shaft 31 is driven exclusively by the first electric motor 10, the second freewheel 33 prevents rotation of the ring gear drive shaft 41. The second freewheel 33 then represents a counter-torque for the ring gear 35. The second freewheel 33 then holds the ring gear 35 stationary. As a result, the first power provided by the first electric motor 10, in particular the first torque provided by the first electric motor 10, can be transmitted to the output shaft 31 by means of the transmission 30. The ring gear 35 is stationary so that the planet gears 36 can rotate on the ring gear 35.

[0050] The sun gear 34 has external teeth. The external teeth of the sun gear 34 interact with the external teeth of the planet gears 36. The internal teeth of the ring gear 35 interact with the external teeth of the planet gears 36. When the planet gears 36 move, the planetary shafts 39 move with the planet gears 36 around the rotation axis 50. Since the planet gears 36 are rotatably mounted on the planetary shafts 39 and the planetary shafts are fixed to the web 38, when the planetary shafts 39 rotate around the rotation axis 50, the web 38 also rotates around the rotation axis 50. Since the web 39 is rotationally fixedly connected to the output shaft 31, the output shaft 31 rotates when the web 38 rotates.

[0051] When the output shaft 31 of the transmission 30 is simultaneously driven by the first power of the first electric motor 10 and the second power of the second electric motor 20, the planetary gears 36 are driven by both the sun gear 34 and the ring gear 35, in particular by the internal toothing of the ring gear 35. The first freewheel 32 then allows a corresponding rotational movement of the sun shaft 40. The second freewheel 33 then allows a corresponding rotational movement of the ring gear drive shaft 41. The ring gear 35 and the sun gear 34 then rotate in the same direction of rotation about the rotation axis 50. The first electric motor 10 and the second electric motor 20 then rotate in the same direction of rotation.

Claims

[1] High-pressure cleaning device comprising: - a connection (2) for a liquid source (3), - a high pressure pump (4), - a main line (5) through which liquid can be conveyed from the connection (2) to an ejection opening (6) of the main line (5) by means of the high-pressure pump (4), and - a first electric motor (10) for driving the high-pressure pump (4), wherein the first electric motor (10) generates a first power characterized by that the high-pressure cleaning device (1) comprises a second electric motor (20) for driving the high-pressure pump (4), wherein the second electric motor (20) generates a second power, that the high-pressure cleaning device (1) comprises a gearbox (30), that the gearbox (30) comprises an output shaft (31) for driving the high-pressure pump (4), and that the gearbox (30) is designed such that the first power and the second power can be used simultaneously to drive the output shaft (31) of the gearbox (30). [2] High-pressure cleaning device according to claim 1, characterized by that the first electric motor (10) is an alternating current motor, in particular a universal motor. [3] High-pressure cleaning device according to claim 1 or 2, characterized by that the second electric motor (20) is a DC motor, in particular a brushless DC motor, most particularly an electronically commutated motor. [4] High-pressure cleaning device according to one of claims 1 to 3, characterized by that the high-pressure cleaning device (1) is designed such that the first electric motor (10) can be operated by means of an external energy source, in particular by means of an alternating voltage, in particular by means of the mains voltage. [5] High-pressure cleaning device according to one of claims 1 to 4, characterized bythat the high-pressure cleaning device (1) comprises an electrical energy source (21), that the electrical energy source (21) is a rechargeable battery or a battery, and that the high-pressure cleaning device (1) is designed to supply the second electric motor (20) with electrical energy by means of the electrical energy source (21). [6] High-pressure cleaning device according to one of claims 1 to 5, characterized by that the gear (30) is designed so that the output shaft (31) can optionally - can be driven simultaneously with the first power and the second power or - can only be driven with one of the two power levels. [7] High-pressure cleaning device according to one of claims 1 to 6, characterized bythat the transmission (30) comprises at least one freewheel (32, 33) which, when the output shaft (31) is driven by only one of the two electric motors (10, 20), prevents power transmission from the electric motor (10, 20) used for driving to the other electric motor (10, 20). [8] High-pressure cleaning device according to one of claims 1 to 7, characterized by that the first electric motor (10) and the second electric motor (20) are electrically completely separated from each other. [9] High-pressure cleaning device according to one of claims 1 to 8, characterized by that the transmission (30) has a single output shaft (31). [10] High-pressure cleaning device according to one of claims 1 to 9, characterized by that the gear (30) is a planetary gear, and in particular that the planetary gear comprises a sun gear (34), a ring gear (35) and planet gears (36). [11] High-pressure cleaning device according to claim 10, characterized bythat the high-pressure cleaning device (1) is designed so that one of the two electric motors (10, 20) can drive the sun gear (34) and that the other of the two electric motors (10, 20) can drive the ring gear (35). [12] High-pressure cleaning device according to claim 11, characterized by that the high-pressure cleaning device (1) is designed such that the first electric motor (10) can drive the sun gear (34) and that the second electric motor (20) can drive the ring gear (35). [13] High-pressure cleaning device according to one of claims 10 to 12, characterized by that the high-pressure cleaning device (1) is designed such that the output shaft (31) can be driven by the planetary gears (36) driven by the sun gear (34) and / or the ring gear (35). [14] High-pressure cleaning device according to claim 13, characterized bythat the output shaft (31) for driving the high-pressure pump (1) is rotatable about a rotation axis (50), and that the planet gears (36) are drivable by the sun gear (34) and / or the ring gear (35) for rotation about the rotation axis (50).

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