Drive device for vehicle that can be driven at least temporarily by means of muscle force

Abstract

The invention relates to a drive device (1) for a vehicle that can be driven at least temporarily by means of muscle force, comprising a housing (4), a pedal crank shaft (2) for receiving the muscle force, an output shaft (3) for outputting a driving force to a drive wheel of the vehicle, a drive motor (5) for providing the driving force, a planetary gear (6) and a traction gear (7), the drive motor (5) is coupled to an input element of the planetary gear (6), and the traction gear has a first traction gear wheel (71) and a second traction gear wheel (72), which are coupled to each other for force transmission. The first traction means wheel (71) is coupled to an output element of the planetary gear (6), and the second traction means wheel (72) can be coupled to the output shaft (3). The pedal crankshaft (2) can be coupled to the output shaft (3) via a shiftable transmission (8).

Description

Technical Field

[0001] This invention relates to a drive mechanism for a vehicle that can be at least temporarily driven by muscle force, wherein the drive mechanism provides a supporting driving force. Furthermore, the invention also relates to a vehicle having such a drive mechanism, for example, designed as an electric scooter or electric-assisted bicycle. Background Technology

[0002] A prior art patent, DE 10 2012 103 355 A1, discloses a vehicle designed as an electric bicycle. The drive unit has an electric motor that can transmit driving force to the output element of the drive unit via a flexible traction device. A planetary transmission is provided between the electric motor and the output shaft of the drive unit in the force transmission path. Summary of the Invention

[0003] Based on existing technology, the objective of this invention is to provide a drive mechanism for a vehicle capable of at least temporarily being driven by muscle force, thereby providing better functionality and more reliable operation. This objective is achieved by a drive mechanism having the features of claim 1. Extended designs of the invention are defined in the dependent claims.

[0004] According to one aspect, a drive mechanism is provided for a vehicle capable of at least temporarily being driven by muscle force. The drive mechanism includes a housing, a pedal crankshaft for receiving muscle force, an output shaft for outputting driving force to the drive wheels of the vehicle, a drive motor for providing driving force, a planetary transmission, and a traction device transmission, wherein the drive motor is connected to the input element of the planetary transmission. The traction device transmission has a first traction device wheel and a second traction device wheel interconnected for force transmission. The first traction device wheel is connected to the driven element of the planetary transmission. The second traction device wheel can be connected to the output shaft, wherein the pedal crankshaft can be connected to the output shaft via a shiftable gearbox.

[0005] The traction device transmission of the drive unit can use a chain as the traction device. In this case, the first and second traction device wheels are constructed as sprockets. The traction device transmission can also use a belt as the traction device. In this case, the first and second traction device wheels are constructed as pulleys. Alternatively, the traction device transmission of the drive unit can use a lateral cylindrical gear transmission with an intermediate pulley. In this case, the first and second traction device wheels are constructed as cylindrical gears.

[0006] A shiftable transmission can have at least two gear ratios. Here, at least two gear ratios are provided between the pedal crankshaft and the output shaft. A transmission can have more than two gear ratios. Furthermore, a transmission can be configured as a continuously variable transmission (CVT). A transmission can have one or more planetary gear sets. A transmission can have a shift element that allows at least two gear ratios to be formed. The transmission can be coaxially arranged around the pedal crankshaft or the output shaft.

[0007] The drive motor of the drive unit can be configured as an electric motor. The electric motor provides driving force, which can be used to support the force transmitted to the pedal crankshaft. The output shaft can be connected to the drive wheel of the vehicle for force transmission. The output shaft can therefore have an output wheel, which can be designed as a sprocket or a pulley. A traction device can be disposed between the output wheel and the drive wheel for force transmission. The traction device can be a chain or a belt, respectively.

[0008] The drive unit can be mounted on a vehicle. In particular, it can be mounted on vehicles designed as bicycles. In this case, the drive unit can be mounted in a section of the bicycle, where the bottom bracket can be located.

[0009] In one embodiment, the planetary gear transmission includes a sun gear, at least one planet gear rotatably supported on a planet carrier, and a ring gear. Here, the sun gear may be engaged with at least one planet gear. Furthermore, at least one planet gear may be engaged with the ring gear. The input element in this current embodiment may be the sun gear. In this embodiment, the output shaft of the drive motor is connected to the sun gear of the planetary gear transmission. The drive motor may have a motor shaft, which can serve as the driven shaft of the drive motor. In this case, the motor shaft may be connected to the sun gear. Furthermore, the sun gear may also be connected to the motor shaft of the drive motor. The sun gear may be directly or indirectly connected to the motor shaft. The teeth of the sun gear may be located on the outer periphery of the motor shaft. In this current embodiment, the driving force of the drive motor is introduced into the planetary gear transmission through the sun gear.

[0010] In an alternative embodiment, the driving force of the drive motor can be introduced into the planetary transmission via a planetary carrier. In an additional alternative, the driving force of the drive motor can be introduced into the planetary transmission via a ring gear.

[0011] In another alternative embodiment, in addition to the planetary transmission, at least one additional planetary transmission may be provided. The at least one planetary transmission may be connected in series with the planetary transmission with reference to the force flow. Therefore, a high transmission ratio can be achieved using interconnected planetary transmissions. This high transmission ratio allows the rotational speed at the output of the planetary transmission to be significantly reduced compared to the rotational speed at the input of the planetary transmission, while the torque at the output can be significantly increased compared to the introduced torque.

[0012] The planetary gears of the planetary transmission can be made of metal. Alternatively, the planetary gears can be made of plastic. At least one of the first and second traction gears can also be made of metal. Alternatively, at least one of the first and second traction gears can be made of plastic. The gear ring can be made of metal. Alternatively, the gear ring can be made of plastic. The gear ring can be formed on the housing element and, in particular, integrally formed with the housing element.

[0013] In one embodiment, the planet carrier can be connected to the first traction device wheel. In this case, the planet carrier can be used as the driven element of the planetary transmission.

[0014] In one embodiment, the planetary carrier is connected to the first traction device wheel via a follower profile. Alternatively, the planetary carrier and the first traction device wheel can be securely connected to each other. Furthermore, the planetary carrier and the first traction device wheel can be implemented as a single unit.

[0015] In one embodiment, the first traction device wheel can be supported on a journal, which is mounted on the inner wall of the housing. The journal can be integrally formed in a component of the housing, forming the inner wall. The journal can be detachably mounted on the housing. The journal can be configured to be coaxial with the planetary transmission. The journal can be configured to rotatably support the first traction device wheel via bearings. In the above case, the journal can be at least partially hollow.

[0016] In one embodiment, the planetary carrier can be connected to a first traction device wheel via a coupling assembly. The coupling assembly can be a separate element disposed between the planetary carrier and the traction device wheel. The coupling assembly can have teeth that engage with corresponding teeth on the traction device wheel.

[0017] In one embodiment, the gear ring can remain stationary relative to the housing. In this case, rotation of the gear ring is not permitted during planetary gear operation. In this configuration, a predetermined transmission can be provided via the planetary gear system. This transmission can be formed between the sun gear and the planet carrier.

[0018] In one embodiment, the second traction device wheel can be configured to be concentric with respect to the output shaft and supported on the outer periphery of the output shaft. The second traction device wheel can have a larger circumference than the first traction device wheel. The second traction device wheel can be supported on the output shaft by bearings.

[0019] In one embodiment, the second traction device wheel can be connected to the output shaft via a free wheel. In this case, when relative rotation occurs between the second traction device wheel and the drive unit, it can be specified that force can be transmitted from the traction device wheel to the output shaft only in the direction of rotation. Specifically, it can be specified that force can be transmitted from the second traction device wheel to the output shaft in a direction of rotation that corresponds to the vehicle's forward direction when the drive unit is mounted on the vehicle. The free wheel between the second traction device wheel and the output shaft can be integrated with a bearing.

[0020] In one embodiment, the pedal crankshaft can extend axially through the output shaft, wherein the pedal crankshaft is radially supported in the output shaft on the output shaft side. The output shaft can also be radially supported in a housing together with the pedal crankshaft. The pedal crankshaft can be constructed as a solid shaft element. The output shaft can be constructed as a hollow shaft. A radial gap can be provided between the pedal crankshaft and the output shaft, in which one or more bearings are provided. The pedal crankshaft can rotate relative to the output shaft, at least in a predetermined operating state of the drive unit.

[0021] In one embodiment, the housing may be configured with partition elements for forming individual housing sections. Each individual housing section may be configured to selectively accommodate components of a drive mechanism. The housing may have partition walls as partition elements. At least a portion of the partition wall may be integrally constructed with the housing. The individual housing sections may form fluidically separated spaces. The housing sections may be matched with the components accommodated within their respective housing sections. The housing sections may have openings for venting, which enable pressure equalization.

[0022] In one embodiment, the pedal crankshaft, output shaft, traction device transmission, and planetary transmission can be housed in a first housing section. The drive motor can be housed in a second housing section. In addition to the aforementioned housing sections, other housing sections may be provided. In particular, an additional housing section may be provided in which electrical or electronic components corresponding to the operation of the drive motor can be housed.

[0023] In one embodiment, a lubricant can be disposed in the first housing section for lubricating components of the drive unit disposed in the first housing section. The lubricant disposed in the first housing section can be selected such that it is suitable for lubricating both the traction device drive and the planetary transmission. The lubricant disposed in the first housing section may include lubricating oil. Alternatively, the lubricant disposed in the first housing section may include lubricating grease. The shiftable transmission may be located in a lower region of the first housing section, thus the shiftable transmission is disposed in an oil pan. The lubricant disposed in the first housing section can be selected such that it is suitable for lubricating not only the traction device drive and the planetary transmission but also the shiftable transmission.

[0024] In one embodiment, the first housing section may be provided with a removable cover that allows access to at least the elements of the traction device's drive mechanism. A journal may be mounted on the inside of the cover. In this embodiment, the cover can be screwed onto the housing elements. The cover may be provided with a sealing element to achieve a seal for the first housing section. The journal may be made of the same material as the cover. The journal may be made of a different material than the cover. The journal may be integrally formed on the cover. The journal can be screwed onto the cover.

[0025] In one embodiment, an adjustable tensioning device for a traction device can be provided on the inner side of the housing cover. The tensioning device can be adjusted from the outside of the housing cover. The tensioning device for the traction device can have a tensioning roller. Alternatively, the tensioning device for the traction device can have a sliding element. The tensioning device can have a mechanism for abutting an element of the tensioning device against the traction device. The tensioning device can have an eccentric wheel mechanism by which the element of the tensioning device can be adjusted to abut against the traction device. The tensioning device can be operated by an adjusting element. The adjusting element can be designed to be operated from the outside of the housing cover. The adjusting element can be designed to be a rotatable adjusting element.

[0026] According to one aspect, a vehicle is provided having at least one drive wheel and a drive mechanism having one or more of the aforementioned features for applying driving force to the drive wheel. The vehicle may be designed as an electric scooter or an electric-assisted bicycle. The vehicle may have the structure of a bicycle. The drive mechanism may be located in an area where a central axle is arranged. The vehicle may have an electrical energy storage device that supplies electrical energy to the drive mechanism. The vehicle may have a control device that controls the operation of the drive mechanism. The drive wheel may be connected to the drive mechanism via a traction device driver. The traction device driver may be configured as a chain drive. Alternatively, the traction device driver may be configured as a belt drive. The drive wheel may be the rear wheel of a vehicle designed as a bicycle. Alternatively, the traction device driver may be configured as a lateral cylindrical gear transmission with an intermediate wheel. Alternatively, the vehicle may be configured as a multi-track vehicle with at least one drive wheel. Attached Figure Description

[0027] Figure 1 A drive mechanism in one embodiment is shown in the sectional view; and

[0028] Figure 2 A drive device in one embodiment is shown to illustrate the housing structure. Detailed Implementation

[0029] Some embodiments of the drive device are described below with reference to the accompanying drawings. Figure 1 A drive mechanism in one embodiment is shown in a sectional view. For example... Figure 1 As shown, the drive unit 1 has a housing 4 configured to accommodate the components of the drive unit 1. The housing 4 of the drive unit 1 is equipped with suitable fasteners for mounting the drive unit 1 onto a vehicle (not shown). In this configuration, the drive unit 1 is used on vehicles designed as electric scooters or electric-assisted bicycles, which in principle have the structure of a bicycle. Here, the drive unit 1 is mounted in an area of ​​the vehicle that typically has a central axle.

[0030] The drive unit 1 has a pedal crankshaft 2, which extends axially from the housing 4 on both sides. Figure 1 In the pedal crankshaft 2 shown, a pedal crank (not shown) with a pedal is provided at the opposite end, through which muscle force can be introduced into the drive unit 1.

[0031] The drive unit 1 also has an output shaft 3, which in the current embodiment is coaxially constructed with the pedal crank shaft 2. The output shaft 3 is designed as a hollow shaft, through which the pedal crank shaft 2 extends. A radial gap is provided between the output shaft 3 and the pedal crank shaft 2, within which bearings 22 and 23 are provided, supported on the inner periphery of the output shaft 3 and the outer periphery of the pedal crank shaft 2. An additional bearing 21 is axially spaced from the bearings 22 and 23 used to support the pedal crank shaft 2 relative to the output shaft 3, supported on the outer periphery of the pedal crank shaft and on the inner periphery of a bearing housing provided in the housing 4. A sealing element 24 is provided axially outside the bearings 21, 22, and 23, configured to seal the pedal crank shaft 2 at its outer periphery.

[0032] The output shaft 3 extends from the housing 4 at one end section. A drive wheel of the drive unit can be mounted at the end section of the output shaft 3 extending from the housing 4. The drive wheel is mounted on the output shaft 3 such that rotation of the output shaft 3 is transmitted to the drive wheel. The drive wheel can be configured as a toothed ring for driving a chain. In an alternative embodiment, the drive wheel can be configured as a pulley for driving a belt drive. The drive wheel, which can be mounted on the output shaft 3, is used to transmit rotation of the output shaft to the drive wheel of a vehicle on which the drive unit 1 is mounted.

[0033] The output shaft 3 extends axially into the housing 4. A bearing 32 is provided on the outer periphery of the drive shaft 3, which is configured to support the output shaft relative to the housing 4. The bearing 32 is inserted into the opening of the housing 4 with its outer periphery for this purpose. A sealing element 33 is provided axially outside the bearing 32 to seal the gap between the housing 4 and the output shaft 3. Thus, the output shaft is supported relative to the pedal crankshaft by bearings 22 and 23, and the output shaft is supported relative to the housing 4 by bearing 32. In other words, the pedal crankshaft is radially supported in the output shaft 3 on the output shaft side by bearings 22 and 23, and the output shaft 3 and the pedal crankshaft 2 are supported together relative to the housing 4 by bearing 32.

[0034] The drive unit includes a traction device transmission device 7, which comprises a first traction device wheel 71, a second traction device wheel 72, and a traction device 73. A free wheel 31 is provided axially within a bearing 32 on the outer periphery of the output shaft. The free wheel 31 is connected to the second traction device wheel 72. Therefore, the second traction device wheel 72 is fitted onto the free wheel 31.

[0035] In the current embodiment, the traction device transmission 7 is configured as a chain drive. For this purpose, the first traction device wheel 71 and the second traction device wheel 72 are configured as sprockets, which are wound with a chain serving as the traction device 73. In an alternative embodiment, the traction device transmission 7 is configured as a belt drive, having first and second traction device wheels 71, 72 configured as pulleys and a belt serving as the traction device 73. In an alternative embodiment, the traction device transmission 7 is configured as a lateral cylindrical gear drive, having first and second traction device wheels 71, 72 configured as running gears and an intermediate pulley serving as the traction device 73.

[0036] The first traction device wheel 71 and the second traction device wheel 72 are supported in a rotatable manner with their axes parallel. For this purpose, the first traction device wheel 71 has a bearing 74 on its inner periphery, which, as in… Figure 1 As can be seen, it is mounted on journal 41. Bearing 74 can be designed as two deep groove ball bearings arranged axially side by side. The effective diameter of the first traction device wheel 71 is smaller than the effective diameter of the second traction device wheel 72. The rotation of the first traction device wheel 71 is transmitted to the second traction device wheel 72 by winding the traction device 73 around the first traction device wheel 71 and the second traction device wheel 72. Due to the aforementioned arrangement of effective diameters, a corresponding transmission ratio is set in the traction device transmission device 7.

[0037] The drive unit has a drive motor 5, which is arranged parallel to the axis of the pedal crankshaft 2 or the output shaft 3. The drive motor 5 has a rotor shaft 53, which is arranged concentrically with the rotor of the drive motor 5. A stator 51, mounted in the housing, is radially located outside the rotor. When energy is applied to the stator 51, the rotor 52 rotates, and thus the motor shaft 53 connected to the rotor 52 can rotate. For this purpose, corresponding bearings 54 and 55 are provided on the outer periphery of the motor shaft 53, and the bearings are inserted into bearing seats in the housing 4 on their outer periphery. A sealing element 56 is provided on the axial face of the bearing 55 facing the rotor 52 of the drive motor 5.

[0038] The drive unit 1 also has a planetary transmission 6, which in Figure 1In the illustrated embodiment, the drive motor 5 is configured to be concentric with respect to the motor shaft 53 of the drive motor 5. The planetary transmission 6 has a sun gear 61, which is positioned at the center of the planetary transmission 6. The sun gear 61 is connected to the motor shaft 53 of the motor 5 in a rotationally inverse manner. The planetary transmission 6 has a plurality of planet gears 62 radially outside the sun gear 61. The planet gears 62 are rotatably supported on a planet carrier 63, which in turn is supported in a manner rotatable relative to the axis of rotation of the sun gear 61. The planetary transmission 6 also has a ring gear 64 outside the planet carrier 62, the ring gear having internal teeth. In the planetary transmission 6, the sun gear 61 engages with the teeth of the planet gears 62. Furthermore, the teeth of the planet gears engage with the teeth of the ring gear 64. The ring gear 64... Figure 1 In the embodiment shown, it is mounted on the housing in a way that resists relative rotation.

[0039] The planet carrier 63 of the planetary transmission 6 is supported on the housing 4 by one or more bearings 66, thus causing the planet carrier to rotate when the sun gear 61 rotates. Based on the predetermined number of teeth of the elements of the planetary transmission 6 and the gear ring 64 rigidly mounted on the housing 4, a predetermined transmission ratio is obtained between the sun gear 61 and the planet carrier 63 in the planetary transmission 6. In particular, the rotation of the sun gear 61 is transmitted to the planet carrier 63 as a slowed rotation based on the predetermined transmission ratio.

[0040] The planetary carrier 63 is connected to the first traction device wheel 71 via a coupling assembly 65. For this purpose, the coupling assembly 65 has elements that allow torque to be transmitted between the planetary carrier 63 and the first traction device wheel 71.

[0041] When the motor shaft 53 rotates, the sun gear 61 connected to the motor shaft 53 is driven. The rotation of the sun gear 61 causes the planet gears 62 to rotate, and the planet carrier 63 thereby rotates based on the gear ring 64 firmly mounted on the housing 4. The rotating planet carrier 63 transmits its rotation to the first traction device wheel 71 through the coupling assembly 65. Due to the rotation of the first traction device wheel 71, the second traction device wheel 72 rotates through the traction device 73. When the second traction device wheel 72 rotates, the free wheel 31 disposed between the second traction device wheel 72 and the output shaft 3 transmits its rotation to the output shaft 3 and thus to the output element to drive the drive wheel of the vehicle, wherein the rotation of the second traction device wheel is associated with the forward direction of the vehicle (the drive unit 1 is mounted on the vehicle). In this way, the drive motor 5, the planetary transmission 6, and the traction device transmission 7 provide a supporting driving force to the output shaft 3. At the same time, the output shaft 3 can also rotate in the opposite direction of rotation to the forward direction of the vehicle because the free wheel 31 is disposed between the second traction device wheel 72 and the output shaft 3.

[0042] A shiftable gearbox 8 is provided in the radial region around the pedal crankshaft 2 of the housing 4. Figure 1 The shiftable transmission 8 of this embodiment has a number of planetary sets, which can be interconnected by shifting elements (not further explained). The shiftable transmission 8 is connected to the pedal crankshaft 2 on the input side and thus receives rotation from the pedal crankshaft 2. The shiftable transmission 8 is connected to the output shaft 3 on the output side, thus transmitting rotation of the pedal crankshaft 2 to the output shaft 3 via the shiftable transmission 8. In an alternative embodiment, the shiftable transmission 8 is configured as a continuously variable transmission (CVT). In one embodiment, the operation of the shifting elements of the shiftable transmission 8 is at least semi-automatically operated by a control device. In another embodiment, the shifting elements of the shiftable transmission 8 are operated by an operating element located on the vehicle and operable by the driver of the vehicle.

[0043] The aforementioned structure of the drive unit 1 allows driving force to be introduced into the drive unit 1 in the form of muscle force via the pedal crankshaft 2. The muscle force introduced into the pedal crankshaft 2 is transmitted to the output shaft 3 via a shiftable gearbox 8. The shiftable gearbox 8 can adjust the gear ratio between the pedal crankshaft 2 and the output shaft 3 according to the situation. When it is necessary to apply supporting driving force to the output shaft 3, the drive motor 5 is operated accordingly, thereby applying supporting driving force to the output shaft 3 via the planetary transmission 6 and the traction device transmission 7. Based on the sensors correspondingly installed on the vehicle, the operation of the drive motor 5 can be controlled in this way, taking into account the torque or other input parameters introduced into the pedal crankshaft 2, thus achieving the operation mode of an electric-assisted bicycle or electric scooter.

[0044] The internal structure of the housing 4 of the drive unit 1 will be explained next. For example, in... Figure 2 As shown, housing 4 has an outer sleeve in which the components of drive unit 1 are housed, with pedal crankshaft 2 on both sides and output shaft 3 extending from housing 4 on one side. In the region radially surrounding pedal crankshaft 2, as previously described, shiftable transmission 8 and its components are provided. Here, an oil chamber 43 is provided within housing 4, containing lubricating oil suitable for lubricating the components of shiftable transmission 8. Oil chamber 43 thus extends radially around pedal crankshaft 2 and, as shown in… Figure 2 As shown, there is an area where the traction device transmission 7 is located. Figure 2As shown, the area where the traction device transmission 7 is located is situated on the right side of the housing 4 and extends at least between the outer periphery of the first traction device wheel 71 and the outer periphery of the second traction device wheel 72. Therefore, lubricating oil is supplied to the shiftable transmission 8 via the lubricating oil provided in the oil chamber 43, and the same lubricating oil is also used to lubricate the traction device transmission 7. Furthermore, the planetary transmission 6 is also located in the same oil chamber 43, thereby enabling effective lubrication of the components of the drive unit 41 located within the oil chamber 43 using the same lubricating oil. When using the flowing lubricating oil in the oil chamber, an oil pan is formed in the lower section of the oil chamber. The components of the shiftable transmission 8 and the second traction device wheel 72 are submerged in this oil pan by the section of the traction device 73 that wraps around the second traction device wheel. This directly lubricates the aforementioned components. When the drive unit 1 is running, the traction device 73 rotates around the first traction device wheel 71, thus delivering lubricating oil to the area where the first traction device wheel 71 is located. The planetary transmission 6 is also located in this area, and the lubricating oil thus reaches the components of the planetary transmission 6 that require lubrication.

[0045] The components of the drive motor 5 are not lubricated by the lubricating oil located in the oil chamber 43 due to their design. More precisely, it is necessary to ensure that the chamber containing the drive motor 5 is separated from the oil chamber 43. For this purpose, a corresponding separating element 47 is provided within the housing 4, which forms a dry chamber 44 in which the components of the drive motor 5 are housed. Figure 2 In the middle, there is another section on the left side of the drive motor 5, which is also designed as a dry chamber 44. In this additional dry chamber, humidity-sensitive electronic or electrical components used to operate the drive unit 1 can be placed.

[0046] The drive unit 1 therefore has a transmission system in which the drive motor 5 first drives the planetary transmission 6, which in turn drives the traction device transmission 7. The output shaft 3 of the drive unit 1 can be driven by this traction device transmission. The output shaft 3 is driven in the current drive unit 1 by means of a shiftable gearbox 8, through the force introduced into the pedal crank shaft 2. By combining the driving force of the drive motor 5 and the driving force of the pedal crank shaft 2, a combined driving force that can be used to drive the vehicle is provided on the output shaft 3.

[0047] Within housing 4, components requiring lubrication are housed in a chamber. The planetary transmission 6, traction drive 7, and shiftable gearbox 8 belong to this chamber. Components of the drive unit 1 that should be separated from the oil chamber 43 are housed in dry chambers 44 and 45, which are separate from the oil chamber 43. For this purpose, housing 4 is provided with corresponding separating elements 47 that separate the oil chamber 43 from the dry chambers 44 and 45.

[0048] In order to achieve the axially offset arrangement of the drive motor 5 and the planetary transmission device 6 with respect to the output shaft 3 and the pedal crank shaft 2, the oil chamber 43 has a chamber section arranged concentrically around the pedal crank shaft 2 and a radial oil chamber section 46 extending radially from the concentric chamber section, in which the traction device transmission device 7 is placed.

[0049] Dry chambers 44 and 45 are additionally divided in the current embodiment. Here, the first dry chamber 44 houses electrical or electronic components for operating the drive unit 1. The second dry chamber 45 houses the drive motor 5. Oil chambers 43 and 46 and dry chambers 44 and 45 have corresponding exhaust assemblies that achieve pressure equalization relative to the surrounding environment.

[0050] In one embodiment, the drive unit 1 is mounted on an electric scooter or electric-assisted bicycle. For this purpose, the drive unit 1 is mounted on the vehicle and the output shaft 3 is connected to the drive wheel via a chain drive. The vehicle, designed as an electric scooter or electric-assisted bicycle, in this case has an electrical energy storage device in the form of a rechargeable battery, a control device for controlling the drive unit 1, suitable sensors for detecting the operating status of the vehicle, and operating elements that the driver can use to control the drive unit 1.

[0051] List of reference numerals

[0052] 1. Drive unit

[0053] 2. Pedal crankshaft

[0054] 21 bearings

[0055] 22 bearings

[0056] 23 bearings

[0057] 24 Sealing elements

[0058] 3 Output shaft

[0059] 31 Freewheel

[0060] 32 bearings

[0061] 33 Sealing elements

[0062] 4. Shell

[0063] 41 journals

[0064] 42. Housing cover

[0065] 43 Oil cavity

[0066] 44 Dry cavity

[0067] 45 Dry cavity

[0068] 46 Oil cavity section

[0069] 47. Separating element

[0070] 5 drive motors

[0071] 51 Stator

[0072] 52 rotors

[0073] 53 Motor Shaft

[0074] 54 bearing

[0075] 55 bearing

[0076] 56 Sealing elements

[0077] 6. Planetary transmission device

[0078] 61. Sun Chakra

[0079] 62 Planetary Wheels

[0080] 63 Planetary Carrier

[0081] 64 Gear Ring

[0082] 65 Connecting components

[0083] 66 bearing

[0084] 7. Traction device transmission device (chain drive device)

[0085] 71 First traction device wheel (sprocket)

[0086] 72 Second traction device wheel (sprocket)

[0087] 73 Traction device (chain)

[0088] 74 bearings

[0089] 8. A gearbox with shiftable gears

Claims

1. A drive unit (1) for a vehicle capable of at least temporarily being driven by muscle force, the drive unit comprising a housing (4), a pedal crankshaft (2) for receiving muscle force, an output shaft (3) for outputting driving force to the drive wheels of the vehicle, a drive motor (5) for providing driving force, a planetary transmission (6), and a traction device transmission (7), wherein, The drive motor (5) is connected to the input element of the planetary transmission device (6). The traction device transmission device has a first traction device wheel (71) and a second traction device wheel (72). The first traction device wheel and the second traction device wheel are connected to each other for force transmission. The first traction device wheel (71) is connected to the driven element of the planetary transmission device (6). The second traction device wheel (72) can be connected to the output shaft (3). The pedal crank shaft (2) can be connected to the output shaft (3) through a shiftable gearbox (8).

2. The driving device (1) according to claim 1, characterized in that, The planetary transmission device (6) has a sun gear (61), at least one planet gear (62) rotatably supported on a planet carrier (63), and a ring gear (64), wherein the sun gear (61) is engaged with the at least one planet gear (62) and the at least one planet gear (62) is engaged with the ring gear (64), wherein the input element is the sun gear (61).

3. The driving device (1) according to claim 2, characterized in that, The planetary carrier (63) is connected to the first traction device wheel (71).

4. The driving device (1) according to any one of the preceding claims, characterized in that, The first traction device wheel (71) is supported on a journal (41), which is mounted on the inner wall of the housing (4).

5. The driving device (1) according to any one of claims 2 to 4, characterized in that, The planetary carrier (63) is connected to the first traction device wheel (71) via a connecting assembly (65).

6. The driving device (1) according to any one of claims 2 to 5, characterized in that, The gear ring (64) remains stationary relative to the housing (4).

7. The driving device (1) according to any one of the preceding claims, characterized in that, The second traction device wheel (72) is concentrically constructed about the output shaft (3) and supported on the outer periphery of the output shaft (3).

8. The driving device (1) according to any one of the preceding claims, characterized in that, The second traction device wheel (72) can be connected to the output shaft (3) via the free wheel (31).

9. The driving device (1) according to any one of the preceding claims, characterized in that, The pedal crankshaft (2) extends axially through the output shaft (3), wherein the output shaft (3) is supported at the pedal crankshaft (2) and in the housing (4).

10. The driving device (1) according to any one of the preceding claims, characterized in that, The housing (4) is constructed with partition elements (47) for forming separate housing sections to selectively accommodate components of the drive unit (1).

11. The driving device (1) according to claim 10, characterized in that, The pedal crankshaft (2), the output shaft (3), the traction device transmission (7) and the planetary transmission (6) are disposed in the first housing section (43), and the drive motor (5) is disposed in the second housing section (45).

12. The driving device (1) according to claim 11, characterized in that, A lubricant is provided in the first housing section (43) for lubricating the components of the drive device (1) disposed in the first housing section (43).

13. The driving device (1) according to claim 11 or 12, characterized in that, The first housing section (43) is provided with a removable housing cover (42) to allow access to at least the components of the traction device transmission (7), wherein the journal (41) is mounted on the inside of the housing cover (42).

14. The driving device (1) according to claim 13, characterized in that, An adjustable tensioning device for the traction device (73) is provided on the inner side of the housing cover (42), wherein the tensioning device can be adjusted from the outside of the housing cover (42).

15. The driving device (1) according to any one of the preceding claims, characterized in that, The traction device transmission device (7) is implemented as a chain transmission device and the first traction device wheel (71) and the second traction device wheel (72) are implemented as sprockets.

16. The driving device (1) according to any one of claims 1 to 13, characterized in that, The traction device transmission device (7) is implemented as a lateral cylindrical gear transmission device with an intermediate wheel, and the first traction device wheel (71) and the second traction device wheel (72) are implemented as cylindrical gears.

17. A means of transport having at least one drive wheel and a drive device (1) for applying a driving force to the drive wheel according to any one of the preceding claims.

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