Stroller comprising a cooling device

Abstract

The invention relates to a stroller (100) comprising: a stroller frame; at least one drive device (210), in particular at least one motor, preferably an electric motor; and at least one cooling device (510) for cooling the at least one drive device (210), wherein the at least one cooling device (510) comprises at least one cooling element (511) and is thermally connected to the at least one drive device (210) in such a way that at least some of the heat generated during operation of the at least one drive device (210) is dissipated into the at least one cooling element (511) in order to reduce the temperature of the at least one drive device (210).

Description

[0001] Stroller with cooling device

[0002] Description

[0003] The invention relates to a stroller with a drive.

[0004] Strollers in general, but also strollers with assisted driving, have been known for many years, including from DE 1817722 U. During operation, the assisted driving heats up, which in the worst case can lead to overheating and damage to the assisted driving. For this reason, various methods are mentioned in the prior art to counteract this. A stroller with assisted driving is known, for example, from KR 200485017 Y1, wherein the housing in which the assisted driving is arranged has an inlet and an outlet opening to allow outside air to flow into and out of the housing interior in order to counteract the heat generated during operation. US 20210009184 A1 also describes a stroller with assisted driving, in which the chassis is equipped with fans (or ventilators) for cooling.One problem with these solutions is that the cooling capacity is usually not sufficient to cool the assist drive sufficiently, which can lead to it overheating and damage.

[0005] It is an object of this invention to solve the aforementioned problem. A further object of the invention is to propose a cost-effective, efficient, and simple solution for cooling an assist drive for a stroller.

[0006] The problem is solved in particular by the subject matter according to claim 1.

[0007] In particular, the problem is solved according to a first aspect by a

[0008] A stroller comprising a stroller frame, at least one drive device, in particular at least one motor, preferably an electric motor, and at least one cooling device for cooling the drive device. The at least one cooling device comprises at least one cooling element and is designed (and arranged) to dissipate heat from the at least one drive device into the at least one cooling element in order to reduce the temperature of the at least one drive device. Cooling can thus be achieved in a simple manner, which improves the operation of the stroller.

[0009] The object is also achieved in particular by a stroller (preferably a stroller according to the first aspect) which comprises a stroller frame and at least one drive device, in particular at least one motor, preferably an electric motor, wherein heat from the at least one drive device is dissipated (or can be dissipated) into the stroller frame, in particular via at least one cooling device, preferably via at least one cooling element comprised by the cooling device, in order to reduce the temperature of the at least one drive device. Cooling can thus be achieved in a simple manner, which improves the operation of the stroller. In particular, an already existing component is utilized in this respect to dissipate heat in an effective manner.

[0010] The object is also achieved in particular by a stroller (preferably according to the first and / or second aspect) comprising: a stroller frame; at least one drive device, in particular at least one motor, preferably an electric motor; wherein the at least one drive device is thermally connected to the stroller frame (in particular in order to dissipate at least part of the heat generated during operation of the drive device into the stroller frame, in particular via at least one cooling device, preferably via at least one cooling element comprised by the cooling device, preferably in order to reduce the temperature of the at least one drive device). Cooling can thus be achieved in a simple manner, which improves the operation of the stroller. In particular, an already existing component is utilized in this respect to dissipate heat in an effective manner.

[0011] A cooling device or cooling element is understood to mean, in particular, a device or element configured for passive cooling, i.e., in particular for dissipating heat to the environment and / or another component, in particular a frame part of the seat. The cooling element is preferably a one-piece, possibly monolithic element. The weight of the cooling element can be at least 10 grams, at least 100 grams, or at least 200 grams, and / or at most 2 kg, or at most 0.5 kg.

[0012] The cooling element can be plate-shaped, at least in sections, and / or configured as a fastening and / or connecting device. The cooling device or cooling element can be equipped without an active cooling means, such as a Peltier element. Alternatively, cooling devices and / or cooling elements can comprise an active cooling means, for example, a Peltier element and / or a heat pump with a fluid circuit and / or heat exchanger.

[0013] The cooling element is preferably an independent component that is provided separately from the frame and / or is not formed integrally, in particular not monolithically, with it.

[0014] The cooling element is preferably designed as a heat-conducting medium (or comprises such a medium) and / or at least partially made of a heat-conducting material (in particular as defined below).

[0015] In preferred embodiments, the stroller comprises a lower frame and a pusher section, wherein the pusher section is arranged in an upper section of the lower frame. The stroller further comprises at least one wheel, preferably at least or exactly three wheels, more preferably at least or exactly four wheels, which can be arranged on a lower section of the lower frame.

[0016] The lower frame preferably comprises a front wheel frame section and a rear wheel frame section, which are in particular rotatably connected to one another via a first joint. The slider section is preferably rotatably connected to the front wheel or rear wheel frame section via a second joint and / or slidably connected to the front wheel frame section. In particular, the first and second joints can be identical to one another, so that the front wheel frame section, rear wheel frame section, and slider section are rotatably connected to one another in a common joint.

[0017] Preferably, at least one wheel is a rear wheel and / or is arranged at a lower and / or rear end of the rear wheel frame section, and / or at least one wheel is a front wheel and / or is arranged at a front and / or upper end of the front wheel frame section. The front wheel and / or rear wheel frame section can comprise a right and a left side strut, which can be connected to one another by at least one cross strut.

[0018] The slider section can have a right and a left side strut, wherein the slider section preferably has a gripping area arranged between the right and left side struts of the slider section. Alternatively, no gripping area can be provided between the right and left side struts, or a gripping area can be arranged at each end of each side section.

[0019] The first and / or second joint may comprise a right and a left joint section, which may be connected to each other via a cross strut.

[0020] The stroller may have a child restraint system and / or be detachably connected to it. A child restraint system is understood to mean, in particular, a child seat and / or a carrycot and / or an infant carrier and / or the like.

[0021] The stroller can be configured such that the child restraint device and / or a first adapter for connecting to the child restraint device is arranged in an upper section of the lower frame or on the push bar section. The first adapter can comprise a right-side and a left-side adapter element, wherein each of the adapter elements can preferably have a coupling section, in particular one facing upwards.

[0022] In embodiments, the stroller has a second adapter for connecting to a (further) child restraint device. The second adapter is preferably arranged below and / or in front of the first adapter, in particular near the at least one front wheel and / or in a lower / front region of the front wheel frame section. The second adapter can comprise a right-side and a left-side adapter element, each of the adapter elements preferably having a coupling section.

[0023] In embodiments, the first adapter is adjustable between an upper and / or rear position and / or between a lower and / or front position. For this purpose, the first adapter can be slidably mounted on the side struts of the slider section. Alternatively or additionally, the second adapter can be transferable between a use position and a stowed position, wherein the coupling section preferably points upwards in the use position. The transfer of the second adapter between the use position and the stowed position can be effected by rotating, folding and / or sliding, preferably in such a way that the second adapter projects further upwards in the use position than in the stowed position. The transfer can be effected for the second adapter as a whole and / or separately for each of the two adapter elements.

[0024] In embodiments, the stroller comprises at least one drive device, in particular at least one motor, preferably an electric motor, for example a hub motor, wherein the drive device is designed to drive and / or brake at least one wheel of the stroller.

[0025] In embodiments, the drive device is arranged in or, in particular, close to (e.g., at a distance of less than 10 cm, less than 5 cm, or less than 2 cm) at least one wheel, wherein the drive device can be connected to the at least one wheel, in particular, via a drive belt. With such spatial proximity, heat can be dissipated in a simple and efficient manner. In particular, air movement caused by the rotation of the wheel can be utilized.

[0026] Preferably, the drive device can be arranged in a lower region of the lower frame, in particular between two wheels, for example between a left and a right rear wheel of the stroller.

[0027] In embodiments, each wheel of the stroller can be assigned its own drive device.

[0028] The (respective) drive device can be arranged such that its axis of rotation is identical to the wheel axis of the at least one wheel or is not identical to the wheel axis of the at least one wheel, wherein the drive device can then be connected to the at least one wheel via the drive belt, preferably such that a rotational frequency of the drive device is higher than a rotational frequency of the at least one wheel.

[0029] In embodiments, the stroller comprises an actuating device for controlling the at least one drive device. The actuating device is preferably adjustable, wherein the drive device is controlled based on the position of the actuating device. In embodiments, the stroller comprises a control device configured to control the drive device depending on a position of the actuating device.

[0030] In embodiments, the stroller comprises an energy storage device, in particular a (rechargeable) battery, wherein the energy storage device is electrically connected to the drive device. The energy storage device (the rechargeable battery) is preferably designed to be removable so that it can be charged independently of the other components of the stroller. The energy storage device can be provided in and / or on a wheel axle connecting the two rear wheels and / or in and / or on a cross brace connecting the left and right side struts.

[0031] A wired and / or wireless connection between the actuating device and the drive device can be established via the control device. For example, the control device can be connected to the drive device in a wired and / or wireless manner and / or to the actuating device in a wired and / or wireless manner. Preferably, the control device is arranged (directly) adjacent (e.g., at a distance of less than 10 cm, less than 5 cm, or less than 2 cm) to the drive device or the actuating device.

[0032] If at least one wheel of the stroller is driven and / or braked by the at least one drive device, the temperature of the drive device rises, which, without cooling, may lead to overheating of the drive device. To reduce the temperature of the at least one drive device, heat from the at least one drive device can be dissipated into other components encompassed by the stroller, e.g., into the stroller frame and / or into at least one cooling device, in particular into a cooling element.

[0033] In embodiments, the at least one drive device can be thermally connected to the stroller frame in order to dissipate at least part of the heat generated during operation of the drive device into the stroller frame. This allows the drive device to be cooled or the temperature of the drive device to be reduced.

[0034] A thermal connection is understood, in particular, to mean a direct connection (e.g., materially bonded and / or touching) or a connection via a thermally conductive medium. Insofar as an element is mentioned here, further above, and / or below that is thermally conductive and / or insofar as a thermally conductive medium is mentioned, the corresponding element or medium should be formed to at least 50 wt.%, at least 90 wt.%, or at least 99 wt.%, possibly at least substantially completely, from a thermally conductive material, in particular as specified in more detail below.

[0035] In embodiments, the stroller can comprise at least one cooling device, wherein the at least one drive device is thermally connected to the at least one cooling device. In particular, (exactly) one cooling device can be provided for at least two, possibly several, drive devices, but preferably at least one, optionally exactly one, cooling device is provided per drive device. The cooling device can comprise at least one cooling element, into which at least a portion of the heat generated during operation of the drive device can be dissipated. Preferably, the cooling device, in particular the at least one cooling element, is thermally connected to the stroller frame in addition to the (at least one) drive device. As a result, a portion of the heat from the at least one drive device can be dissipated both into the cooling device, in particular into the at least one cooling element, and into the stroller frame.

[0036] In embodiments, the drive device can be arranged on a fastening element, wherein the drive device is in particular firmly connected to the fastening element, e.g., by means of a screw, rivet, adhesive, and / or welded connection. The fastening element is preferably plate-shaped, at least in sections, and / or consists at least partially or in sections of a heat-conducting material (e.g., stainless steel).

[0037] The fastening element and / or the drive device can be directly and / or indirectly connected and / or thermally connected to the stroller frame and / or the cooling device, in particular the at least one cooling element. For example, the fastening element and / or the drive device can be indirectly connected and / or thermally connected to the stroller frame via the cooling device, in particular the at least one cooling element, and / or via heat-conducting, possibly plate-shaped, intermediate elements, and / or the fastening element and / or the drive device can be indirectly connected and / or thermally connected to the cooling device, in particular the at least one cooling element, via heat-conducting, possibly plate-shaped, intermediate elements. In embodiments, the drive device and / or the fastening element and / or at least one heat-conducting, possibly plate-shapedplate-shaped intermediate element and / or the at least one cooling device, in particular the at least one cooling element, have a connecting section which is connected to the stroller frame, in particular the rear wheel frame section, e.g. by screw and / or rivet and / or adhesive and / or welded connection, preferably welded connection.

[0038] In embodiments, the drive device can comprise a housing that is at least partially made of a thermally conductive material. In particular, at least one side of the housing, preferably a side of the housing facing the fastening element and / or a thermally conductive intermediate element and / or the cooling device, in particular the cooling element, and / or the stroller frame, can be at least partially made of a thermally conductive material. Additionally or alternatively, the fastening element can form one side of the housing.

[0039] In embodiments, the fastening element and / or the drive device (optionally via the fastening element) can be designed to be rotatable or pivotable about a rotation axis relative to the stroller frame and / or at least one wheel. In particular, the distance between the rotation axis of the wheel and the rotation axis of the (motor) shaft of the drive device can be increased and / or decreased in order to adjust the tension of the drive belt that connects the drive device to the at least one wheel. Preferably, the fastening element is connected to the cooling device, in particular a cooling element, or to the stroller frame so as to be rotatable or pivotable about a rotation axis. The rotation of the fastening element and / or the drive device (optionally via the fastening element) can be limited, for example, by a guide groove.

[0040] A thermally conductive material is to be understood in particular as a material having a thermal conductivity at 20 °C in W / (m*K) of at least 4, more preferably at least 20, more preferably at least 60, more preferably at least 180 and / or at most 2000 or at most 500.

[0041] The thermally conductive material may comprise (stainless) steel and / or aluminum and / or copper and / or silver (e.g., in a proportion in wt. % of at least 30 or at least 50 or at least 80, optionally at least substantially completely, unless logically excluded). According to the embodiment, a thermally conductive material may be understood as a material with (in particular made of) a thermally conductive alloy, with a thermal conductivity at 20°C in W / (m*K) of at least 4, more preferably at least 20, more preferably at least 60, more preferably at least 180 and / or at most 2000 or at most 500.

[0042] In embodiments, the at least one cooling device, in particular the at least one cooling element, and / or the stroller frame and / or the drive device (or its housing) and / or the fastening element and / or the intermediate elements can be made at least partially of a thermally conductive material, e.g. steel and / or aluminum and / or copper and / or silver, and / or have a thermally conductive alloy, e.g. an aluminum alloy and / or a copper alloy. The material and / or the alloy can in particular have a thermal conductivity at 20°C in W / (m*K) of at least 4, more preferably at least 20, more preferably at least 60, more preferably at least 180 and / or at most 2000 or at most 500.

[0043] In embodiments, the contact surface (for thermal connection) between at least two of the drive device, fastening element, intermediate element, cooling device (or cooling element) and stroller frame can have an area of ​​at least 2 cm 2 , preferably at least 10 cm 2 , further preferably at least 50 cm 2 and / or an area of ​​no more than 1000 cm 2 , preferably no more than 200 cm 2 , further preferably no more than 150 cm 2 , have.

[0044] In embodiments, a thermally conductive medium, e.g., thermally conductive paste and / or liquid metal, can be arranged between the contacting (or touching) surfaces of at least two of the drive device, fastening element, intermediate element, cooling device (or cooling element), and stroller frame, which preferably form the contact surface. In particular, this can improve the thermal connection.

[0045] In embodiments, the at least one cooling device may comprise a housing, wherein in particular the at least one cooling element, and optionally the drive device and / or the fastening element and / or at least one intermediate element, are arranged at least partially within the housing.

[0046] In embodiments, the cooling device can comprise at least two cooling elements, wherein in particular at least one cooling element is arranged at least partially within the stroller frame, preferably the rear wheel frame section. Additionally or alternatively, the at least one cooling device, in particular the at least one cooling element, can be at least partially adjacent to a thermal insulator. For example, a cooling element that is at least partially arranged within the stroller frame can be adjacent to a thermal insulator to reduce heat transfer from the cooling element to the stroller frame.

[0047] A thermal insulator is understood to mean, in particular, a material (or a gas or a liquid) with a thermal conductivity at 20 °C in W / (m*K) of at most 3.5; preferably at most 2; more preferably at most 0.5, and / or at least 0.001, e.g. plastic (polymer).

[0048] In embodiments, at least one cooling element and / or the fastening element and / or at least one intermediate element and / or the drive device, in particular the housing of the drive device, and / or the stroller frame, can have at least two, preferably a plurality of cooling fins or cooling pins to enlarge the surface in order to increase the heat transfer to the environment and thus improve the cooling.

[0049] In embodiments, the cooling device can comprise at least one airflow generation device to cool the at least one cooling element and / or the drive device and / or the fastening element and / or at least one intermediate element and / or the stroller frame. In particular, the heat transfer from the surface of the at least one cooling element and / or the drive device and / or the fastening element and / or at least one intermediate element and / or the stroller frame to the environment can be improved (or increased) via the generated airflow.

[0050] The at least one air flow generating device can be arranged in the vicinity (in particular at a distance of less than 20 cm or less than 10 cm or less than 5 cm) of the at least one cooling element and / or the drive device and / or the fastening element and / or at least one intermediate element, preferably on the stroller frame and / or at least partially within the housing of the cooling device.

[0051] In embodiments, the housing of the cooling device may comprise at least one, preferably at least two, opening(s), in particular at least one inlet and / or outlet opening, e.g. a hole(s) and / or slot(s), in order to preferably allow (outside) air to flow into and / or out of the housing.

[0052] In embodiments, the at least one air flow generating device can be designed as a fan with at least three, preferably a plurality of fan blades (or fan vanes).

[0053] The airflow generating device can be electrically connected to the energy storage device and / or the control device, e.g., via a cable. The airflow generating device can be controlled such that it only generates an airflow when the wheels are driven by the drive device and / or such that an airflow is generated when the temperature of the drive device and / or the fastening element and / or an intermediate element and / or the cooling element and / or the stroller frame is above a predetermined value.

[0054] In order to detect the temperature, a sensor device (e.g. a temperature sensor) can be provided.

[0055] Alternatively or additionally, at least one airflow generating device can be part of at least one wheel of the stroller and / or part of the wheel's rotational axis and / or be formed by at least one wheel of the stroller, wherein the at least one wheel comprises at least three, preferably a plurality of fan blades (or vanes) and / or the spokes of the wheel are shaped like (or as) fan blades (or vanes). As a result, during travel, the rotation of the wheel itself can generate an airflow that improves (or increases) the heat transfer from the surface of the at least one cooling element and / or the drive device and / or the fastening element and / or at least one intermediate element and / or the stroller frame to the environment.

[0056] Further embodiments emerge from the subclaims.

[0057] Further embodiments are explained below, particularly in the accompanying figures. They show:

[0058] Figure 1 is an oblique front view of the stroller;

[0059] Figure 2 shows the rear, lower end of the rear wheel frame section; Figure 3 shows a schematic configuration of the stroller;

[0060] Figure 4 the rear, lower end of the rear wheel frame section;

[0061] Figure 5 shows the rear, lower end of the rear wheel frame section from an opposite perspective;

[0062] Figure 6a shows a schematic design of the cooling device, in particular a rear, lower end of a side strut of the rear wheel frame section;

[0063] Figure 6b shows another type of thermal connection of the drive device;

[0064] Figure 6c shows a further embodiment of the cooling device, wherein the

[0065] The drive device is connected to the cooling element via the fastening element;

[0066] Figure 6d shows a similar structure to Figure 6c, wherein a (heat-conducting) intermediate element is arranged between the drive device, the fastening element and the cooling element;

[0067] Figure 7a shows the air flow generating device as an independent element;

[0068] Figure 7b the air flow generating device as part of the wheel axle;

[0069] Figure 7c shows the air flow generating device as part of the wheel;

[0070] Figure 8 shows a part of the stroller frame, in particular the

[0071] Rear wheel frame section or its side strut.

[0072] Figure 1 shows an embodiment of a stroller 100 with a pusher section 120, a front wheel frame section 130, and a rear wheel frame section 140. The pusher section 120 can comprise a left and a right side strut 121 and a handle area 122 arranged between the left and right side struts 121. The handle area 122 can comprise an actuating device 230. The left and right side struts 121 can each have a rail 102, in particular on their inner side, wherein a respective first adapter 170 can be displaceably arranged on the respective rail 102, which is shown in a lower position in Fig. 1. The front wheel frame section 130 can have a left and a right side strut 131, which can be connected to one another by means of a cross strut 132.A respective second adapter 180 can be provided on the inner side of the respective side strut 131 of the front wheel frame section 130. Two (alternatively one or more than two) front wheels 191 can be arranged at the front, lower end of the front wheel frame section 130.

[0073] The upper rear end of the front wheel frame section 130 can be rotatably connected to a lower, front end of the slider section 120 via a first joint 150. The rear wheel frame section 140 can have right and left side struts 141, which can be connected to each other via the cross strut 142, wherein an energy storage device 220 can be arranged on the cross strut 142.

[0074] The front, upper end of the rear wheel frame section 140 can be connected to the front wheel frame section 130, in particular via a second joint 160. Rear wheels (or at least one rear wheel) 192 can be arranged at the rear, lower end of the rear wheel frame section 140, wherein the respective rear wheel 192 is driven by a drive device (motor) 210. Additionally, a cooling device 510, preferably for cooling the drive device or motor, is provided, in particular for each drive device (motor) 210.

[0075] Figure 2 shows the rear, lower end of the rear wheel frame section 140 of the stroller 100 from Figure 1. The energy storage device 220 can be arranged on the cross strut 142 between the left and right side struts 141 of the rear, lower end of the rear wheel frame section 140.

[0076] A drive device (motor) 210 and an associated cooling device 510 are arranged on the respective (or at least one) rear wheel 192 (where only one drive device or motor 210 and only one cooling device 510 are visible in this view). A parking brake 101 can be arranged on at least or exactly one rear wheel 192 (generally: somewhere between the rear wheels or at another location), with which the stroller 100 can be secured against unintentional rolling away when not in use.

[0077] Figure 3 schematically shows an exemplary configuration of the stroller 100. The control device 240 can be connected electrically, wired and / or wirelessly, to the actuating device 230, a drive device (motor) 210, a sensor device 250 and an air flow generating device 540 of the cooling device 510. The drive device (motor) 210 and the air flow generating device 540 can be electrically connected to an energy storage device 220. The control device 240 can be configured to receive data from the sensor device 250, e.g., speed and / or direction of travel of the stroller 100 and / or the direction of rotation of at least one wheel 190, and / or from the actuating device, e.g., its position, and / or from the drive device (motor) 210, e.g., its temperature, and / or from the cooling device 510, e.g., a temperature.

[0078] Figures 4 and 5, like Figure 2, show the rear, lower end of the rear wheel frame section 140 of the stroller 100 from Figure 1. The cooling device 510 is shown with its housing 513 at a lower, rear end of a side strut 141, and the interior of the (corresponding) housing 513 of the cooling device 510 is shown at the other, lower, rear end of a second side strut 141. The drive device 210 can be arranged within the housing 513 of the cooling device 510.

[0079] The drive device 210 can be connected to or thermally connected to the fastening element 214, which in turn can be connected to or thermally connected to the cooling element 511 of the cooling device 510. The cooling element 511 can comprise a connecting section 512, which can be connected to the (respective) side strut 141 of the rear wheel frame section 140 and can be thermally connected to the side strut 141, e.g., via a welded connection. As a result, part of the heat generated during operation of the drive device 210 can be dissipated both into the cooling element 511 of the cooling device 510 and into the rear wheel frame section 140 (or its side strut 141) of the stroller frame.

[0080] Figures 6a to 6d show highly schematically various embodiments of the cooling device 510, or different ways in which the drive device 210 can be thermally connected to other elements of the cooling device and / or the stroller 100.

[0081] Figure 6a shows a rear, lower end of a side strut 141 of the rear wheel frame section 140. The rear, lower end of the side strut 141 comprises, for example, the connecting section 512. In a further embodiment, the connecting section 512 can be comprised by the drive device 210 instead of the side strut 141 (or by both). The drive device 210 is connected to the rear wheel 192 via the wheel axle 193 and can drive it. The wheel axle 193 extends through an opening (not shown) in the side strut 141 in the region of the connecting section 512. The drive device 210 and the connecting section 512 are arranged within the housing 513 of the cooling device 510, wherein the drive device 210 is connected to the connecting section 512 via the contact surface 530 and is thermally connected to the connecting section 512 and thus to the side strut 141.

[0082] In order to improve the thermal connection, a heat-conducting medium 531 can be provided in the region of the contact surface 530 (wherein the heat-conducting medium is formed, for example, to at least 50% by weight, optionally at least 80% by weight or at least 99% by weight, from a material which has a thermal conductivity as defined above and / or a thermal conductivity at 20 °C in (W / (m*K)) of at least 4, preferably at least 10, more preferably at least 50, more preferably at least 150 and / or at most 2000 or at most 500).

[0083] Figure 6b shows a further embodiment of the cooling device 510 or a further type of thermal connection of the drive device 210. The drive device 210 is connected to the cooling element 511 and thermally connected thereto. The wheel axle 193, which connects the rear wheel 192 to the drive device 210, extends through an opening (not shown) of the cooling element 511. This time, the cooling element 511 comprises the connecting section 513, which is connected to the side strut 141 of the rear wheel frame section 140 and thermally connected thereto. As in Figure 6a, a heat-conducting medium 531 (e.g., as defined above with regard to material selection or thermal conductivity) can be provided in the region of the contact surfaces 530 between the drive device 210 and the cooling element 511 and between the cooling element 511 and the side strut 141.

[0084] Figure 6c shows a further embodiment of the cooling device 510 or a further type of thermal connection of the drive device 210. The drive device 210 is connected to the cooling element 511 via the fastening element 214. The drive device 210 is thermally connected to the fastening element 214, which in turn is thermally connected to the cooling element 511. As in Figure 6b, the cooling element 511 comprises the connecting section 512, via which the cooling element 511 is thermally connected to the side strut 141 of the rear wheel frame section 140. In this embodiment, the wheel axle 193 runs through an opening (not shown) in the fastening element 214 and the cooling element 511. As in Figures 6a and 6b, a heat-conducting medium 531 (e.g. as described above with regard to the choice of material or

[0085] thermal conductivity defined).

[0086] Figure 6d shows a similar structure to Figure 6c, with a (heat-conducting) intermediate element 520 arranged between each drive device 210, fastening element 214, and cooling element 511. In this embodiment, the wheel axle 193 extends through an opening (not shown) in the fastening element 214, the cooling element 511, and each intermediate element 520. As in Figures 6a to 6c, a heat-conducting medium 531 (e.g., as defined above with regard to material selection or thermal conductivity) can be provided in the region of the contact surfaces 530.

[0087] It should be noted that combinations of the various embodiments of Figures 6a-6d, or, for example, an arrangement of several intermediate elements 520 one behind the other, are also possible.

[0088] Figures 7a to 7c show, highly schematically, various embodiments of the cooling device 510 with an air flow generation device 540. The drive device 210 is arranged within the housing 513 of the cooling device 510 and is connected to the cooling element 511 of the cooling device and thermally connected thereto. The drive device 210 is connected to the wheel 190 via the wheel axle 193 and can drive the wheel, wherein the wheel axle 193 extends through an opening (not shown) of the cooling element 511 and the housing 513. The housing 513 can comprise housing openings 514, wherein one side of the housing 513 can comprise inlet openings 515 and the other side can comprise outlet openings 516. The air flow generation device 540 is preferably located in the vicinity (e.g.The airflow generating device 540 is arranged at a distance of less than or equal to 5 cm or less than or equal to 2 cm from the cooling element 511 and can preferably generate an airflow 541, wherein outside air can flow into the housing 513 through the inlet openings 515 and out again through the outlet openings 516. The airflow generating device 540 preferably comprises a plurality of fan blades.

[0089] According to Figure 7a, the airflow generating device 540 is designed as a standalone element; in particular, the airflow generating device 540 is not a component of the wheel axle and / or the wheel. The airflow generating device 540 is illustrated, by way of example, as a fan with a plurality of fan blades. The airflow generating device 540 can be electrically connected to the control device 240 and the energy storage device 220, e.g., via a cable (not shown), wherein the airflow generating device 540 can be controlled via the control device 240.

[0090] According to Figure 7b, the air flow generating device 540 is formed as part of the wheel axle 193, wherein the wheel axle 193 has fan blades within the housing.

[0091] According to Figure 7c, the airflow generating device 540 is formed as part of the wheel 190, wherein the wheel 190 may comprise a plurality of fan blades. In particular, the spokes of the wheel may be shaped like fan blades. As a result, the airflow generating device 540 can generate an airflow 541 through the rotation of the wheel 190 itself (as in Figure 7b).

[0092] Figure 8 shows a highly schematic view of a part of the stroller frame, in particular the rear wheel frame section 140 or its side strut 141. A cooling element 511 can be partially arranged within the side strut 141 and can adjoin a thermal insulator 550 (wherein the insulator is formed, for example, to at least 50 wt. %, optionally at least 80 wt. % or at least 99 wt. % from a material having a thermal conductivity as defined above and / or a thermal conductivity at 20°C in (W / (m*K)) of at least 0.001 or at least 0.010 or at least 0.030 and / or at most 3.5, preferably at most 1 or at most 0.1 or at most 0.05) in order to reduce heat transfer from the cooling element 511 to the side strut 141 of the rear wheel frame section 140 of the stroller frame.

[0093] In the following, aspects are disclosed which are proposed, either individually or in combination with one of the preceding aspects, to solve the above problem.

[0094] According to a first aspect of the invention, the stroller comprises a stroller frame, at least one drive device, in particular at least one motor, preferably an electric motor, and at least one cooling device for cooling the at least one drive device, wherein the at least one cooling device comprises at least one cooling element and is thermally connected to the at least one drive device in such a way that at least part of the heat generated during operation of the at least one drive device is dissipated into the at least one cooling element in order to reduce the temperature of the at least one drive device.

[0095] According to a second aspect of the invention, the stroller according to the first aspect further comprises a stroller frame, at least one drive device, in particular at least one motor, preferably an electric motor, wherein the at least one drive device is thermally connected to the stroller frame in order to dissipate at least part of the heat generated during operation of the drive device into the stroller frame, in particular via at least one cooling device, preferably via at least one cooling element comprised by the cooling device, in order to reduce the temperature of the at least one drive device.

[0096] A third aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the stroller comprises at least one wheel, preferably three wheels, more preferably four wheels, and / or the stroller frame comprises a front wheel frame section, a rear wheel frame section, and a pusher section, wherein preferably at least one wheel is a rear wheel and is arranged at a lower and / or rear end of the rear wheel frame section, and / or at least one wheel is a front wheel and is arranged at a lower and / or front end of the front wheel frame section, and / or the front wheel frame section and the rear wheel frame section are rotatably connected to one another via a first joint, and / or the pusher section is rotatably connected to at least one of the front wheel frame section and the rear wheel frame section via a second joint, and / or the pusher section is slidably connected to the front wheel frame section.

[0097] A fourth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein one, optionally exactly one, cooling device is provided for at least two drive devices or at least one, optionally exactly one, cooling device is provided for each drive device.

[0098] A fifth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the drive device is arranged on a fastening element, in particular is firmly connected to the fastening element, and wherein the fastening element preferably consists at least partially or in sections of heat-conducting material.

[0099] A sixth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the at least one drive device and / or the fastening element according to aspect 5 is directly and / or indirectly connected and / or thermally connected to the stroller frame and / or the cooling device, in particular the at least one cooling element.

[0100] A seventh aspect of the invention relates to a stroller according to the sixth aspect, wherein the fastening element and / or the drive device is / are indirectly connected and / or thermally connected to the stroller frame via the cooling device, in particular the at least one cooling element, and / or via heat-conducting, optionally plate-shaped, intermediate elements and / or indirectly connected and / or thermally connected to the cooling device, in particular the at least one cooling element, via heat-conducting, optionally plate-shaped, intermediate elements. An eighth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the drive device and / or the fastening element according to the fifth aspect and / or at least one heat-conducting, optionally plate-shaped, intermediate elementsplate-shaped intermediate element and / or the at least one cooling device, in particular the at least one cooling element, has a connecting section which is connected to the stroller frame, in particular the / a rear wheel frame section.

[0101] A ninth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the at least one cooling device, in particular the at least one cooling element, and / or the at least one connecting element has a (second) connecting section which is connected to the at least one drive device, e.g. by screw and / or rivet and / or adhesive and / or welded connection, preferably welded connection.

[0102] A tenth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the drive device comprises a housing which consists at least partially of a thermally conductive material, in particular at least one side of the housing, preferably a side of the housing which faces the fastening element and / or a thermally conductive intermediate element and / or the cooling device, in particular the cooling element, and / or the stroller frame.

[0103] An eleventh aspect of the invention relates to a stroller according to the tenth aspect, wherein the fastening element forms one side of the housing of the drive device.

[0104] A twelfth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the at least one cooling device, in particular the at least one cooling element, and / or the stroller frame and / or the drive device (or its housing) and / or the fastening element and / or at least one intermediate element consist at least partially of a thermally conductive material, e.g. steel and / or aluminum and / or copper and / or silver, and / or comprise a thermally conductive alloy, e.g. an aluminum alloy and / or a copper alloy.

[0105] A thirteenth aspect of the invention relates to a stroller according to the twelfth aspect, wherein the material and / or the alloy has a thermal conductivity of at least 4 W / (m*K), preferably at least 60 W / (m*K), more preferably at least 180 W / (m*K).

[0106] A fourteenth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the contact surface (for thermal connection) between at least two of the drive device, fastening element, intermediate element, cooling device (or cooling element) and stroller frame has an area of ​​at least 2 cm 2 , preferably at least 10 cm 2 , further preferably at least 50 cm 2 and / or an area of ​​no more than 1000 cm 2 , preferably no more than 500 cm 2 , further preferably a maximum of 200 cm 2 , has.

[0107] A fifteenth aspect of the invention relates to a stroller according to the fourteenth aspect, wherein a heat-conducting medium, e.g., heat-conducting paste and / or liquid metal, is arranged between the contacting (or touching) surfaces of at least two of the drive device, fastening element, intermediate element, cooling device (or cooling element), and stroller frame, which preferably form the contact surface according to aspect 14, in particular to improve the thermal connection.

[0108] A sixteenth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the at least one cooling device comprises a housing, wherein in particular the at least one cooling element, and optionally the drive device and / or the fastening element and / or at least one intermediate element, is / are arranged at least partially within the housing. A seventeenth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the at least one cooling device comprises at least two cooling elements, wherein in particular at least one cooling element is arranged at least partially within the stroller frame, preferably the rear wheel frame section.

[0109] An eighteenth aspect of the invention relates to a stroller according to one of the preceding aspects, in particular the seventeenth aspect, wherein at least one cooling device, in particular at least one cooling element, is at least partially adjacent to a thermal insulator.

[0110] A nineteenth aspect of the invention relates to a stroller according to the seventeenth aspect, wherein the cooling element, which is arranged at least partially within the stroller frame, is adjacent to a thermal insulator in order to reduce heat transfer from the cooling element to the stroller frame.

[0111] A twentieth aspect of the invention relates to a stroller according to any one of the preceding aspects eighteen or nineteen, wherein the thermal insulator is a material (or a gas or a liquid) having a thermal conductivity of at most 3.5 W / (m*K), preferably at most 2 W / (m*K), more preferably at most 0.5 W / (m*K), e.g. plastic.

[0112] A twenty-first aspect of the invention relates to a stroller according to one of the preceding aspects, wherein at least one cooling element and / or the fastening element and / or at least one intermediate element and / or the drive device, in particular the housing of the drive device, and / or the stroller frame, has at least two, preferably a plurality of cooling fins or cooling pins to enlarge the surface.

[0113] A twenty-second aspect of the invention relates to a stroller according to any one of the preceding aspects, wherein the cooling device comprises at least one air flow generating device for cooling the at least one cooling element and / or the drive device and / or the fastening element and / or at least one intermediate element and / or the stroller frame.

[0114] A twenty-third aspect of the invention relates to a stroller according to the twenty-second aspect, wherein the at least one air flow generating device is arranged in the vicinity of the at least one cooling element and / or the drive device and / or the fastening element and / or at least one intermediate element, preferably on the stroller frame and / or at least partially within the housing of the cooling device according to aspect 16.

[0115] A twenty-fourth aspect of the invention relates to a stroller according to the sixteenth or twenty-third aspect, wherein the housing of the cooling device comprises at least one, preferably at least two, opening(s), in particular at least one inlet and / or outlet opening, e.g. holes and / or slots, to preferably allow (outside) air to flow into and / or out of the housing.

[0116] A twenty-fifth aspect of the invention relates to a stroller according to the twenty-second aspect, wherein the at least one air flow generating device is designed as a fan with at least three, preferably a plurality of fan blades (or fan vanes).

[0117] A twenty-sixth aspect of the invention relates to a stroller according to the twenty-second aspect, wherein at least one air flow generating device is a part of at least one wheel of the stroller and / or is formed by at least one wheel of the stroller, wherein the at least one wheel comprises at least three, preferably a plurality of fan blades (or fan vanes) and / or the spokes of the wheel are shaped like fan blades (or fan vanes).

[0118] A twenty-seventh aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the at least one drive device is designed to drive at least one wheel of the stroller.

[0119] A twenty-eighth aspect of the invention relates to a stroller according to any one of the preceding aspects, wherein the stroller comprises an actuating device, wherein the at least one drive device is based on a position of the actuating device.

[0120] A twenty-ninth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the stroller comprises a control device which is configured to control the drive device depending on a position of the actuating device.

[0121] A thirtieth aspect of the invention relates to a stroller according to one of the preceding aspects, wherein the stroller comprises an energy storage device, in particular a preferably rechargeable battery, wherein the energy storage device is connected to the drive device.

[0122] A thirty-first aspect of the invention relates to a stroller according to any one of the preceding aspects, wherein the stroller comprises a first adapter for connecting to a first child-carrying device and / or a second adapter for connecting to a second child-carrying device, wherein the second adapter is arranged below the first adapter and / or in the vicinity of the at least one front wheel according to the third aspect.

[0123] A thirty-second aspect of the invention relates to a stroller according to the twenty-fourth aspect, wherein the first adapter is adjustable, in particular displaceable, between an upper and / or rear position and a lower and / or front position, and / or wherein the second adapter is transferable between a use position and a storage position. It should be noted at this point that all of the above-described parts, viewed individually and in any combination, in particular the details shown in the drawings, are claimed as essential to the invention. Modifications thereof will be apparent to those skilled in the art.

[0124] Furthermore, it is pointed out that the broadest possible scope of protection is sought. In this respect, the disclosure contained in the claims can also be clarified by features that are described with further features (even without these further features being mandatory). It is explicitly pointed out that parentheses and the term "in particular" are intended to emphasize the optionality of features in the respective context (which does not mean, conversely, that without such identification, a feature is to be considered mandatory in the corresponding context). The term "element / element" is preferably intended to identify a coherent structure (or assembly), which in turn can be connected to at least one other structure (to form a possibly integral and / or inherently immobile overall structure) or can be separated from all other structures.

[0125] List of reference symbols

[0126] 100 - Strollers

[0127] 101 - Parking brake

[0128] 102 - Rail

[0129] 120 - Slide section

[0130] 121 - Side strut

[0131] 122 - Grip area

[0132] 130 - Front wheel frame section

[0133] 131 - Side strut

[0134] 132 - Cross brace

[0135] 140 - Rear wheel frame section

[0136] 141 - Side strut

[0137] 142 - Cross brace 150 - First joint 160 - Second joint 170 - First adapter 180 - Second adapter

[0138] 190 - Wheel

[0139] 191 - Front wheel

[0140] 192 - Rear wheel 193 - Wheel axle

[0141] 210 - Drive device (motor)

[0142] 213 - Housing (drive device)

[0143] 214 - Fastening element

[0144] 220 - Energy storage

[0145] 230 - Actuating device

[0146] 240 - Control device

[0147] 250 - Sensor device

[0148] 510 - Cooling device

[0149] 511 - Cooling element

[0150] 512 - Connecting section

[0151] 513 - Housing (cooling device)

[0152] 514 - Housing opening

[0153] 515 - Inlet opening(s)

[0154] 516 - Outlet opening(s)

[0155] 520 - Intermediate element

[0156] 530 - Contact surface

[0157] 531 - Heat-conducting medium

[0158] 540 - Air generating device

[0159] 541 - Airflow

[0160] 550 - Thermal Insulator

Claims

Claims 1. Stroller (100), comprising: - a stroller frame, - at least one drive device (210), in particular at least one motor, preferably an electric motor, and - at least one cooling device (510) for cooling the at least one drive device (210), characterized in that the at least one cooling device (510) comprises at least one cooling element (511) and is thermally connected to the at least one drive device (210) in such a way that at least part of the heat generated during operation of the at least one drive device (210) is dissipated into the at least one cooling element (511) in order to reduce the temperature of the at least one drive device (210).

2. Stroller (100), in particular according to claim 1, comprising: - a stroller frame, - at least one drive device (210), in particular at least one motor, preferably an electric motor, characterized in that the at least one drive device (210) is thermally connected to the stroller frame in order to dissipate at least part of the heat generated during operation of the drive device (210) into the stroller frame.

3. Stroller (100) according to one of the preceding claims, characterized in that one, optionally exactly one, cooling device (510) is provided for at least two drive devices (210) or at least one, optionally exactly one, cooling device (510) per drive device (210).

4. Stroller (100) according to one of the preceding claims, characterized in that the drive device (210) is arranged on a fastening element (214), in particular is firmly connected to the fastening element (214), and wherein the fastening element (214) preferably consists at least partially or in sections of heat-conducting material.

5. Stroller (100) according to one of the preceding claims, characterized in that the at least one drive device (210) and / or the fastening element (214) according to claim 4 is directly and / or indirectly connected and / or thermally connected to the stroller frame and / or the cooling device (510), in particular the at least one cooling element (511).

6. Stroller according to the immediately preceding claim, characterized in that the fastening element (214) and / or the drive device (210) is / are connected to the stroller frame indirectly via the cooling device (510), in particular the at least one cooling element (511), and / or via at least one heat-conducting, optionally plate-shaped, intermediate element (520) and / or is / are connected to the cooling device (510), in particular the at least one cooling element (511), indirectly via at least one heat-conducting, optionally plate-shaped, intermediate element (520).

7. Stroller (100) according to one of the preceding claims, characterized in that the drive device (210) and / or the fastening element (214) according to claim 4 and / or at least one heat-conducting, optionally plate-shaped, intermediate element (520) and / or the at least one cooling device (510), in particular the at least one cooling element (511), has a connecting section (512) which is connected to the stroller frame, in particular the / a rear wheel frame section (140).

8. Stroller (100) according to one of the preceding claims, characterized in that the at least one cooling device (510), in particular the at least one cooling element (511), and / or the at least one connecting element has a, optionally a second, connecting section (512) which is connected to the at least one drive device (210), preferably by means of a welded connection.

9. Stroller (100) according to one of the preceding claims, characterized in that the drive device (210) comprises a housing (213) which preferably consists at least partially of a thermally conductive material.

10. Stroller (100) according to one of the preceding claims, characterized in that the at least one cooling device (510), in particular the at least one cooling element (511), and / or the stroller frame and / or the drive device (210) and / or the fastening element (214) and / or at least one intermediate element (520) consist at least partially of a thermally conductive material, e.g. steel and / or aluminum and / or copper and / or silver, and / or comprise a thermally conductive alloy, e.g. an aluminum alloy and / or a copper alloy, wherein the material and / or the alloy preferably has a thermal conductivity of at least 4 W / (m*K), preferably at least 60 W / (m*K), more preferably at least 180 W / (m*K).

11. Stroller (100) according to one of the preceding claims, characterized in that a heat-conducting medium (531), e.g. heat-conducting paste and / or liquid metal, is arranged between the contacting surfaces of at least two of the drive device (210), fastening element (214), intermediate element (520), cooling device (510) (or cooling element (511)) and stroller frame, in particular to improve the thermal connection.

12. Stroller according to one of the preceding claims, characterized in that at least one cooling element is arranged at least partially within the stroller frame, preferably the rear wheel frame section.

13. Stroller according to one of the preceding claims, in particular according to claim 12, characterized in that at least one cooling device, in particular at least one cooling element, is at least partially adjacent to a thermal insulator.

14. Stroller according to one of the preceding claims, characterized in that at least one cooling element and / or the fastening element and / or at least one intermediate element and / or the drive device, in particular the housing of the drive device, and / or the stroller frame, has at least two, preferably a plurality of cooling fins or cooling pins to enlarge the surface.

15. Stroller (100) according to one of the preceding claims, characterized in that the cooling device (510) comprises at least one air flow generating device (540) in order to cool the at least one cooling element (511) and / or the drive device (210) and / or the fastening element (214) and / or at least one intermediate element (520) and / or the stroller frame, wherein at least one air flow generating device (540) is preferably a part of at least one wheel (190) of the stroller (100) and / or is formed by at least one wheel (190) of the stroller (100).

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