阅读说明：本技术 童车车架和童车 (Bassinet frame and bassinet ) 是由 R·霍莱斯 于 2020-03-09 设计创作，主要内容包括：本发明涉及一种童车车架(10),包括：至少一个电机(18a、18b),用于优选辅助驱动所述童车车架(10)；至少一个车轮连接装置(13),特别是轮轴,优选是后轮轴；以及至少一个与车轮连接装置(13)连接或能连接的电池模块(20),所述电池模块在安装状态下至少局部地设置在车轮连接装置(13)之外并且至少大部分、特别是完全地设置在车轮连接装置(13)的上端部的水平的下方,和/或至少局部地设置在车轮连接装置(13)的下面。(The invention relates to a stroller frame (10) comprising: at least one electric motor (18a, 18b) for preferably assisting in driving the stroller frame (10); at least one wheel connection (13), in particular an axle, preferably a rear axle; and at least one battery module (20) which is connected or connectable to the wheel connection device (13) and which, in the installed state, is arranged at least partially outside the wheel connection device (13) and at least largely, in particular completely, below the level of the upper end of the wheel connection device (13) and/or at least partially below the wheel connection device (13).)

1. Stroller frame (10), comprising:

at least one electric motor (18a, 18b) for preferably assisting in driving the stroller frame (10);

at least one wheel connection (13), in particular an axle, preferably a rear axle; and

at least one battery module (20) which is connected or connectable to the wheel connection device (13) and which, in the installed state, is arranged at least partially outside the wheel connection device (13) and at least largely, in particular completely, below the level of the upper end of the wheel connection device (13) and/or at least partially below the wheel connection device (13).

2. Stroller frame (10), in particular according to claim 1, comprising:

at least one electric motor (18a, 18b) for preferably assisting in driving the stroller frame (10);

at least one wheel connection (13), in particular an axle, preferably a rear axle; and

at least one battery module (20) connected or connectable to the wheel connection device (13), which battery module is arranged at least partially outside the wheel connection device (13) in the installed state and has a height and/or a diameter which is at most 1.5 times, preferably at most 1.0 times, the height or the diameter of the wheel connection device (13).

3. Stroller frame according to claim 1 or 2, characterized in that the battery module (20) is arranged in the mounted state at least partially, in particular mostly, preferably completely, on an inner side of a first vertical plane (22) comprising the center of the stroller frame, which extends perpendicular to the horizontal plane and perpendicular to the direction of travel and comprises outer ends, preferably rear ends, of the wheel connection means, and/or in that the battery module is arranged such that a projection of the battery module (20) on the vertical plane (22) at least partially, preferably mostly and/or incompletely overlaps a projection of the wheel connection means (13) on the vertical plane (22).

4. Stroller frame according to any of the preceding claims, characterized in that the battery module (20) extends over at least half the track of the wheels connected by the wheel connection means and/or over at least half the length of the wheel connection means (13).

5. Stroller frame according to any of the preceding claims, characterized in that the battery module (20) is detachable from the wheel connection means (13), in particular by means of a tool and/or manually.

6. A stroller frame according to any of the preceding claims, wherein the battery module does not comprise a motor for at least auxiliary driving of the stroller frame.

7. Stroller frame according to any of the preceding claims, characterized in that the battery module (20) is largely, in particular completely, obscured by the wheel connection means (13) in the mounted state, viewed from at least one first angle, preferably more than 0 °, more preferably more than 20 ° and/or less than 90 °, preferably less than 60 °, relative to a horizontal plane, and/or largely, in particular completely, unobstructed by the wheel connection means (13) in the mounted state, viewed from at least one second angle.

8. Stroller frame according to any of the preceding claims, characterized in that the edge portions of the cross section of the wheel connection means (13) which in the mounted state do not lie against the battery module (20) are rounded, in particular are configured at least approximately in the shape of an arc, preferably in the shape of a circular arc, and/or the edge portions of the cross section of the battery module (20) which in the mounted state do not lie against the wheel connection means (13) are rounded, in particular are configured at least approximately in the shape of an arc, if appropriate with rounded corner regions or without rounded corner regions.

9. Stroller frame according to any of the preceding claims, characterized in that in the mounted state the outer surfaces of the wheel connection means (13) and of the battery module (20) at least partially at least substantially transition into each other.

10. Stroller frame according to any of the preceding claims, characterized in that a positioning aid, preferably at least one stop, is provided, in particular on the flat side of the wheel connection means, preferably on one edge of the flat side.

11. Stroller frame according to any of the preceding claims, characterized in that an operating device (2.1), in particular to be operated by foot, for a brake, in particular a parking brake, is provided, which operating device is preferably provided at least partially, more preferably exclusively, on the wheel connection device (13) and/or not on a battery module (20).

12. Stroller frame according to any of the preceding claims, characterized in that at least one locking device, in particular a snap lock device, is provided for connecting, in particular snap locking, the wheel connection device (13) and the battery module (20) to each other.

13. Stroller with a stroller frame (10) according to any of the preceding claims.

Technical Field

The invention relates to a motor-driven stroller frame and a corresponding stroller.

Background

Motor-driven strollers are known in principle. Such a stroller may be configured such that the stroller can only be moved by motor force. Furthermore, it is known in principle to extend a motor assist to the buggy, which motor assist provides an assist force to the driving force exerted by the person operating the buggy, but not when the operator is not exerting a force.

A buggy with an electric motor and a battery for powering the motor is known from EP 2019016B 1. In one embodiment, the battery is arranged outside the axle which supports one wheel at each of the two ends. In another embodiment, the battery is integrated in a cavity of the shaft. When disposed outside the shaft, the battery is poorly protected. The batteries are better protected when arranged inside the shaft, but other difficulties arise in this case, in particular in terms of dimensioning, mounting and handling of the batteries.

Disclosure of Invention

It is therefore an object of the invention to provide a buggy frame and a corresponding buggy, which buggy bracket and buggy bracket are simple and still reliable in operation. In particular, it should be possible to use the batteries required for the electric machine as simply and without complications as possible.

Said object is achieved in particular by a frame for a buggy according to claim 1.

The object is particularly achieved by a stroller frame comprising: at least one motor for preferably assisting in driving the stroller frame; at least one wheel connection, in particular an axle, preferably a rear axle; and at least one battery module connected or connectable to the wheel connection device, which battery module is arranged in the mounted state at least partially outside the wheel connection device and at least partially, preferably mostly, in particular completely, below the upper end of the wheel connection device.

A first core aspect of the invention is that the battery module is arranged (at least in the mounted state) at least partially outside the wheel connection device and at least partially, in particular mostly, preferably completely, below the upper level of the upper end of the wheel connection device. This allows, on the one hand, easier access to the battery module, in particular for removal or replacement of the battery module. By the lower arrangement, the battery module is preferably at least partially protected by the wheel connection arrangement which is always provided. Furthermore, a stable arrangement for stably supporting the battery or the entire buggy (or buggy frame) is achieved by the lower center of gravity associated therewith. In this way, for example, when the battery is removed for charging or is installed after charging, a simple and still reliable use of the battery is achieved in a particularly simple manner and form.

In particular, the battery module should be at least largely arranged below the level of the upper end of the wheel connection device. This means in particular that the center of gravity and/or the mid-height of the battery module is arranged below the level of the upper end of the wheel connection device, in particular at least 0.5cm, preferably at least 1cm, below this level, and/or that at least 10%, preferably at least 20%, of the extension of the height of the wheel connection device (meaning the distance of the level of the upper end of the wheel connection device to the level of the lower end of the wheel connection device or meaning the (maximum) vertical extension of the respective element or of the respective device; and in particular in the operating state of the buggy) is below this level. The midpoint height here and behind refers in particular to the height which lies halfway (in the vertical direction) between the upper end of the respective device or component and the lower end of the same device or component. Preferably, the center of gravity of the battery module is preferably located below the level of the center of gravity of the wheel connecting device.

The level of the upper end of the wheel connection device is in particular a (horizontal) plane, which contains the upper end of the wheel connection device. This is to be understood as passing through the highest point or highest points of the wheel connection (in the operating state). For a common axle, these peaks may constitute a line.

The arrangement at least partially below the wheel connection preferably means an arrangement in which the battery module is accessible or partially visible from the outside in the installed state. Preferably in this sense (in the case of a cell module considered alone) at least 10%, more preferably at least 50%, of the outer surface of the cell module is exposed in this case. If desired, the battery module may be located completely outside the wheel connection device, or the battery module may be located at least 30% by weight and/or at least 30% by volume, or at least 80% by weight and/or at least 80% by volume outside the wheel connection device. In particular, the battery module should not be (at least not completely) arranged within the wheel connection device, for example in a corresponding cylindrical cavity of the wheel connection device. This may make the use of the battery module difficult.

Alternatively or in addition to the above-described arrangement below the level of the upper end of the wheel connection device, the battery module should be arranged at least partially below (or directly below) the wheel connection device. That is, if the wheel connection device is considered to be an "umbrella" and the area below the wheel connection device is considered to be the area protected by the umbrella when water drops fall vertically, the battery module is preferably at least partially, more preferably mostly, if necessary completely, or if necessary not completely in this protected area. The arrangement at least partially below the wheel connection device means in particular that at least one part of the projection of the battery module onto a horizontal plane overlaps the projection of the wheel connection device (onto the horizontal plane). In particular, at least 10%, preferably at least 30% and/or at most 90% of the projection area of the battery module should overlap the respective projection area of the wheel connection. Alternatively or additionally, the respective portion of the battery module (constituting the overlapping projection surfaces) represents at least 30% by weight and/or at least 30% by volume, or at most 90% by weight and/or at most 90% by volume, of the entire battery module. In a specific embodiment, if necessary, at least some sections of the battery are not arranged below the wheel connection device in this sense, even though these sections may be arranged below the level of the upper end of the wheel connection device.

According to a further (possibly independent, but especially combinable with one or more of the above and/or below aspects) aspect of the invention, a stroller frame, especially a stroller frame as described above, is proposed, the stroller frame comprising: at least one motor for preferably assisting in driving the stroller frame; at least one wheel connection means, in particular a wheel link, preferably an axle, more preferably a rear axle; and at least one battery module connected or connectable to the wheel connection device, which battery module is arranged at least partially outside the wheel connection device in the mounted state and has a height and/or a maximum diameter (perpendicular to the longitudinal axis of the wheel connection device) which is at most 1.5 times, preferably at most 1.0 times, the height or the maximum diameter of the wheel connection device. The maximum diameter of the respective device or of the respective element means in particular the distance of the point pair which has the greatest distance from one another, taking into account the entire cross section perpendicular to the (respective) longitudinal axis. Overall, a simple to use and still reliable energy supply can be achieved.

The wheel connection device is in particular a device which connects two wheels of a wheel pair (preferably directly) to one another and holds and supports the two wheels. Such a wheel connection is preferably provided in the form of a (possibly at least in the operating state of the buggy) substantially horizontally extending tie rod, possibly cylindrically (but not cylindrically, at least not necessarily cylindrically). The (axial) length of such a wheel connection is preferably at least 5 times the (maximum) diameter, i.e. the maximum distance of a point pair in the entire cross-section perpendicular to the axial length. In at least one state of the interconnected wheels, the wheel connection is preferably located completely inside a cylinder, the end face of which is formed by the outer side of the wheel.

The wheel connection preferably has a height extension (in the operating state) of less than 15cm, more preferably less than 7 cm. Functionally and/or structurally independent units and/or elements, such as, for example, the operating device and/or the motor housing and/or the brake, are preferably not (but can be) considered to be part of the wheel connection device. The wheel connection preferably extends at least over 80%, in particular 90%, if appropriate over the entire distance of the wheels connected to one another.

In a particular embodiment, the wheel connection means may constitute or comprise a wheel link or axle, preferably a rear axle (alternatively a front axle). Alternatively, the wheel connection device is configured as or comprises an axle. The wheels assigned to the wheel connection are preferably driven by at least one electric motor (for example, jointly or individually by one electric motor).

A battery module is understood to mean in particular a module (structurally bounded or capable of being bounded) which comprises at least one battery. Here, one battery may contain one or more primary battery cells. The battery is preferably a secondary battery. The module may preferably be defined by a housing outwardly bounding the module. This housing is cylindrical in some embodiments (but not, at least not necessarily, but may also be cylindrical). The battery module may have a weight of at least 100g, preferably at least 400g and/or at most 3kg, preferably at most 700 g. The (maximum) capacity may be at least 10Wh (0.28 Ah at 36V), preferably at least 40Wh (1.11 Ah at 36V) and/or at most 400Wh (11.1 Ah at 36V), if desired at most 150Wh (4.17 Ah at 36V), for example 93.6Wh (2.6 Ah at 36V). Preferably, at least one or the at least one battery (if appropriate a plurality or all provided batteries) is/are a lithium ion battery and/or a 18650 battery and/or a cylindrical, in particular cylindrical, and/or prismatic, and/or soft-pack cell.

The battery module preferably has a height extension (in the operating state) of less than 15cm, more preferably less than 5cm and/or more than 1cm and/or a depth extension (in the operating state) of less than 20cm, more preferably less than 7cm and/or more than 2 cm. The battery modules preferably extend over at least 50%, in particular at least 65% and/or up to 90% of the distance between the wheels to be connected to one another and/or the longitudinal extent of the wheel connection device. The battery module may also extend over more than 70% or even 90% of the distance, if necessary.

The battery module (in the longitudinal extension; in the mounted state or in the operating state of the stroller/buggy frame) preferably extends at least substantially parallel to a line connecting the two wheels connected by the wheel connection, in particular parallel to a line connecting the centers of the two wheels to be connected, and/or extends at least substantially parallel to the longitudinal extension of the wheel connection, and/or extends substantially horizontally.

The installation state is understood to be a state in which the battery module is arranged in the frame of the buggy in such a way (in particular in a correspondingly designed manner or at a battery receptacle and/or a battery holding structure provided for this purpose) that the electric motor can be supplied with current (as long as the corresponding device, such as for example an electric switch, is operated/has been operated).

The wheel connection device or battery module is preferably (in particular at least 5 cm)²Preferably at least 10cm²On the faces) are in contact with each other or are in direct connection respectively or at least can be directly connected to each other.

The wheel connection means may be a hollow profile or a housing, or the wheel connection means may comprise at least such a hollow profile or housing.

At least one drive device, i.e. at least one electric motor, can be arranged on or adjacent to the wheel connection device.

In the following (as long as this is not stated differently), a vertical plane is intended to mean a plane which runs perpendicular to the horizontal direction and perpendicular to the direction of travel. The vertical plane, referred to as the first vertical plane, is preferably tangent to the outer, further preferably rear, end of the wheel connection device. In this case, the end of the wheel connection at the outside is located further from the centre (centre of gravity) of the buggy frame or buggy than the end at the corresponding inside. For the rear wheel link or rear wheel axle, the outer end is then correspondingly the rear end (or the end pointing opposite to the direction of travel); for the front wheel link or front wheel axle, the outer end is correspondingly the front end. The inner side refers to the half space defined by the respective vertical plane and accommodating the frame of the buggy or the centre (centre of gravity) of the buggy.

The battery module is preferably arranged at least partially, in particular predominantly, preferably completely, inside the first vertical plane. Alternatively or additionally, the battery module is arranged such that a projection of the battery module onto the vertical plane at least partially, preferably largely and/or incompletely, overlaps with a projection of the wheel connection device onto the vertical plane. The substantial arrangement or overlap here also means that, in particular, at least 50% by weight or 50% by volume, preferably at least 70% by weight or 70% by volume, of the battery module satisfy the respective conditions. In general, the projection of the center of gravity of the battery module on a first vertical plane may be located within or alternatively outside the projection of the wheel connection arrangement on this vertical plane. Safe and reliable use is also achieved in this arrangement or design of the battery module.

Preferably, the battery module extends over at least half, more preferably at least 80%, even more preferably at least 95%, of the (axial) length of the wheel connection device and/or the track width of the wheels connected by the wheel connection device. As a result, the battery module can be protected more effectively or can be used more easily, in particular by the wheel connection device.

That is, the object indicated above is also achieved (as an independent or optionally improved aspect, optionally with the above and/or the following additional features and/or optionally without features relating to the height setting of the battery module and/or the dimensioning of the battery module in the height direction or with respect to the diameter) by a buggy frame comprising: at least one motor for preferably assisting in driving the stroller frame; at least one wheel connection means, in particular a wheel link, preferably an axle, more preferably a rear axle; and at least one battery module connected or connectable to the wheel connection device, which battery module is arranged in the mounted state at least partially outside the wheel connection device and which battery module extends over at least half, more preferably at least 80%, even more preferably at least 95%, of the (axial) length or longitudinal extension of the wheel and/or the wheel connection device of the wheel connected by the wheel connection device.

The battery module or the housing of the battery module is preferably at least partially in (direct) physical (and/or electrical) contact with the wheel connection device or the housing and/or the outer wall of the wheel connection device.

According to one embodiment, the battery module is in particular detachable from the wheel connection device by means of a tool and/or preferably manually. For this purpose, for example, at least one manual operating device, such as in particular a button, a push button, a pulling element and/or a lever, can be provided. Thereby further simplifying the use of the battery module.

According to one embodiment, the battery module is designed without an electric motor and/or other drive elements (for at least auxiliary driving of the frame of the buggy), such as a transmission. The battery module can thus be constructed in a smaller structure, which further simplifies use.

Preferably, the battery module is largely, in particular completely, hidden by the wheel connection device in the installed state, viewed from at least one first angle. The at least one first angle or, if appropriate, at least one of a plurality of first angles (which meet this condition) is preferably greater than 0 °, more preferably greater than 20 ° and/or less than 90 °, preferably less than 60 °, relative to the horizontal plane (in this case, in particular starting from an obliquely downward viewing direction). Alternatively or additionally, the battery module is largely, in particular completely, unobstructed by the wheel connection device in the installed state, as viewed from at least one second angle. The second angle can be rotated through 180 ° relative to the first angle (but in this case in particular starting from an oblique upward viewing direction). In this solution, the battery module is not visible in a (normal) viewing direction obliquely downward from the outside (in particular from the rear for the person pushing the cart). This makes it possible to achieve an aesthetically pleasing appearance and at the same time to protect the battery module against external influences, such as the feet of a person pushing on the vehicle. It has been recognized here that in particular the feet of the operator are usually brought into contact with the rear wheel links or rear wheel axles from obliquely above, for example in order to operate the brakes or to put the foot on.

The wheel connection and/or the battery module preferably has (respectively) a flat (planar) side, for example at least 5cm²Preferably at least 10cm²More preferably at least 50cm²And/or up to 500cm²And an upper extension. In one embodiment, the wheel connection and the battery module are connected to one another (directly) via their flat sides.

The edge portions of the cross section of the wheel connection device (in the installed state) that do not lie against the battery module are preferably rounded (corner-free or edge-free), in particular at least substantially arc-shaped, preferably circular arc-shaped. Alternatively or additionally, the edge portions of the cross section of the battery module (in the mounted state) that do not rest on the wheel connection device are rounded, in particular at least substantially arc-shaped, if appropriate with rounded corner regions or without rounded corner regions. The cross section referred to herein is preferably a cross section perpendicular to the axis of the wheel connecting device or the battery module. The battery modules can accordingly be approximately quadrangular, in particular rectangular or trapezoidal, with rounded corners in the region facing away from the wheel connection and/or with unrounded corners in the region facing the wheel connection. Overall, the risk of damage can be reduced by such a design with rounded portions (possibly rounded corner regions). In addition, an aesthetically pleasing appearance of the battery module is thereby achieved, which is virtually invisible.

The outer surfaces of the wheel connection device and the battery module preferably transition into one another (in the mounted state) at least in regions at least substantially (flush or without steps). This also prevents objects or body parts from becoming caught or reduces the corresponding risks, so that the battery module can be installed particularly safely.

According to one embodiment, the battery module can be removed from the installed state, wherein for this purpose the locking device is (only) released. An additional positioning structure, preferably at least one stop, may be provided (in particular on the flat side of the wheel connection device, preferably on the edge of the flat side), in particular so that the correct position can be visually detected when the battery module is installed.

The stroller frame preferably comprises an operating device for the brakes, in particular the parking brakes, which is particularly foot-operable, which is preferably arranged at least partially, more preferably exclusively, on the wheel connection (in contact therewith) and/or not on the battery module (not in contact therewith). In particular in such a wheel connection with an operating device, the arrangement according to the invention of the battery module is particularly advantageous, since the battery module is then protected from "operating steps".

According to one embodiment, the stroller frame comprises at least one locking device, in particular a latching device, for connecting, in particular latching, the wheel connection device and the battery module to one another.

The above-mentioned object is also achieved by a buggy, such as a toddler, a pram or a similar buggy, having a buggy frame of the type described above. The stroller may include a receptacle for a child (e.g., a carrying bag and/or a seating unit) in addition to the stroller frame. The receiving means can be present separately or separable from the stroller frame or (if necessary inseparably) connected to the stroller frame.

Further embodiments follow from the dependent claims.

Drawings

The invention is described below with reference to an embodiment which is described in detail with reference to the drawings. Wherein:

FIG. 1 shows a perspective view of a stroller frame according to the present invention;

fig. 2 shows a detail of the embodiment according to fig. 1 in a view of the rear axle with the battery attached;

fig. 3 shows a partial sectional view according to fig. 2;

FIG. 4 shows a view similar to FIG. 2, with the battery turned down;

fig. 5 shows a further perspective view of a detail from fig. 2, in which the battery is completely released; and

fig. 6 shows a partial sectional view according to fig. 5.

Detailed Description

The following description uses like reference numerals for like and functionally like parts.

Fig. 1 shows a (partially schematic) buggy comprising a buggy frame 10 and a receiving device 11 (only schematically shown in dashed lines as a space-occupying structure) which is connected or connectable to the buggy frame 10 by means of holding devices 12a, 12 b. The stroller frame 10 comprises a (first) wheel connection in the form of a rear wheel link or rear axle 13 and a (second) wheel connection in the form of a front wheel link 14. For the sake of clarity, in particular the rear wheel axle 13 and the components assigned to the rear wheel axle 13 are further explained. The corresponding embodiment is generally applicable here to any wheel connection (although in particular to the rear wheel axle 13 as an element connecting two rear wheels).

Specifically, the rear wheel axle 14 connects the rear wheels 15a, 15b, while the front wheel axle 14 connects the front wheels 16a, 16 b.

Motors 18a, 18b are provided on the ends 17a, 17b of the rear wheel axle 13. These motors drive one of the wheels 15a or 15b, respectively. Furthermore, further (obliquely running) tie rods 19 are provided at the ends 17a, 17b, which are likewise part of the stroller frame 10 and are not described further below. These (obliquely extending) tie rods are not an integral part of the wheel connection or, in particular, of the rear wheel axle 13.

Other components of the stroller frame 10, particularly the handlebar assembly 20 with grips 21, are used to push and/or pull the stroller.

As can be seen in fig. 1, the motors 18a, 18b are arranged outside the rear wheel axle 13. This concept (also in the case of a single motor or a plurality of motors) is to be understood independently of the specific embodiment (for example as a modification of one of the claims). In particular, the at least one electric machine 18a, 18b can be arranged in a separate housing with respect to the wheel connection device and/or at least partially, in particular completely (for example over an angle of at least 180 ° or at least 270 °) around the wheel connection device or the housing of the wheel connection device.

Conceptually, the wheel connecting means (or specifically the rear wheel axle 13) is an element configured for connecting and holding a pair of wheels. Thus, other components, such as, for example, the electric machines 18a, 18b (and/or an actuating device for the parking brake and/or the battery module, which is described below), are not necessarily considered to be a component of the wheel connection or rear axle, even if these components are arranged (if appropriate directly) next to and/or on the wheel connection.

The battery module 20 is only schematically shown in fig. 1. The battery module 20 is described in detail with reference to the following drawings.

Fig. 2 shows a detail of the embodiment according to fig. 1 in a view looking towards the rear wheel axle and from the inside of the first vertical plane, that is to say in this case from the direction of the front wheel. Here, too, an operating device 41 for a parking brake (not shown in detail) for locking at least one rear wheel 18a, 18b (or parking the buggy in general) can be seen (see also fig. 1). The operating device 41 is arranged only on the rear wheel axle 13 or not on the battery module 20. This prevents the operating device 41 from making the battery module 20 difficult to use.

The battery module 20 extends at least substantially over the entire (axial) length of the rear wheel axle 12 and/or over a large part (at least 50%, preferably at least 65%) of the track between the wheels, in the present case for example between the rear wheels.

To illustrate the position of the battery module 20, reference is made below to different planes, which are shown with reference to fig. 3 (with corresponding lines applied to schematically represent or show these planes). The first vertical plane is indicated in fig. 3 by a line, which is also indicated by reference numeral 22. The second vertical plane is similarly indicated by a line with reference numeral 23. The first horizontal plane is similarly indicated by a line with reference numeral 24. The second horizontal plane is correspondingly indicated with reference numeral 25. A first vertical plane 22 is tangent to the rear wheel axle 13 from the outside or in the present case from the rear. The second vertical plane 23 is tangent to the rear wheel axle 13, respectively from the inside or in the present case from the outside. The first horizontal plane 24 is tangent to the rear wheel axle 13 from above. The second horizontal plane 25 is tangent to the rear wheel axle 13 from below. In this case it is assumed that the frame of the buggy is in a running state.

As shown in fig. 3, battery module 23 is disposed at least mostly (directly) below rear axle 13 (but some sections of battery module 20 are also not disposed below rear axle 13, particularly when rear axle 13 is considered an umbrella and the area below rear axle 13 is considered an area protected by the umbrella when water drops fall vertically). In other words, the battery module 20 is mostly (in the sense of more than 50% by weight and/or at least 50% by volume) arranged between the first vertical plane 22 and the second vertical plane 23 and the smaller part is arranged inside the second vertical plane 23.

Furthermore, the battery module 20 is arranged completely below the level of the first horizontal plane 24 and partially, in particular mostly (also in the sense of more than 50% by weight and/or at least 50% by volume) below the level of the second horizontal plane 25.

Also shown in fig. 3 are batteries 26a, 26b inside the housing 27 of the battery module 20. The battery module 20 (or its housing 27) has a battery module flat side 28, which (in the mounted state) rests against a wheel connection device flat side 29. By this fitting, the mechanical contact or mutual engagement of the battery module 20 and the wheel connecting device (here, the rear wheel axle 13) can be achieved in a simple manner and form. It can also be seen in fig. 3 that the rear wheel axle 13 is at least substantially semicircular in the cross section shown here or has an exposed (free) wall 30 which extends in an arc-shaped manner, in particular in the shape of a circular arc. The exposed wall portion 30 does not include corners or edges.

Similarly, the exposed (in the mounted state) wall portion 31 of the battery module 20 preferably also does not include corners or edges. In particular, this exposed wall 31 can also be curved (but if necessary not circular) in cross section. The plurality of cells 26a, 26b can be introduced particularly efficiently when there is a deviation from the arc shape or when (rounded) corners are formed.

Fig. 4 shows a view similar to fig. 2, but for the purpose of illustration the battery module 20 is shown turned down, so that a (wedge-shaped) opening 32 is formed between the battery module 20 and the rear axle 13. In this position, the battery module is no longer held (but alternatively may also be held), and the battery module may fall if, for example, a person is not holding the battery module. The (exemplary) fixing of the battery module 20 on the rear axle 12 (generally: wheel connection) can thus be recognized. At the (pointed) end 33 inside the opening 32, the retaining means 34 of the battery module 20, in particular comprising hooks, are embedded in corresponding counter structures 35 (in general: at least one counter structure) of the rear wheel axle 12. On the outer edge of the opening 32 formed in fig. 4, a further engagement element 36 (in general: at least one engagement element 36) is provided on the battery module 30. By means of the engagement element 36, the battery module 20 can be (snap-locked) engaged with the rear wheel axle 13. For this purpose, the battery module 20 can be tilted from the position according to fig. 4 toward the rear wheel axle 13.

The corresponding counter-structure on the rear wheel axle 13 for the engagement element 36 (in general: at least one counter-structure) is not shown in detail in fig. 4, but its position can be marked, for example, at 37. This counter structure 37 is preferably spring-loaded and/or can be pushed (by the engagement element 36, in particular by a corresponding ramp of the engagement element) in order to fix the battery module 20. Furthermore, the counter structure 37 can be disengaged from the engagement element 36 by means of the operating device 40, so that the locking can be undone. The operating device 40 may in particular be configured as a slider (alternatively or additionally may be configured as a pressing element, for example a button, configured as a pulling element and/or a lever).

In the illustration according to fig. 5 and 6, the engagement element 36 and the holding device (hook) 34 are again shown (but viewed from a different direction with respect to fig. 4).

It is pointed out here that all of the above-described parts, taken individually and in any combination, and in particular the details shown in the figures, are claimed as essential to the invention. Variations on this are well known to those skilled in the art. In particular, it is to be noted that all the explanations concerning the rear wheel axle 13 also apply in general to the wheel connection device.

List of reference numerals

10 baby carriage frame

11 accommodating device

12a holding device

12b holding device

13 rear wheel link, in particular rear wheel axle

14 front wheel connecting rod

15a rear wheel

15b rear wheel

16a front wheel

16b front wheel

17a end part

17b end portion

18a motor

18b electric machine

19 draw bar

20 handle frame

21 handle

22 first vertical plane

23 second vertical plane

24 first horizontal plane

25 second horizontal plane

26a battery

26b cell

27 housing

28 cell module flat side

29 flat side of wheel attachment

30 exposed wall part

31 exposed wall part

32 opening

33 end portion

34 holding device

35 corresponding structure

36 scarf element

37 corresponding structure

40 operating device

41 operating device