Pressure balancing device for mobility device

Abstract

The invention relates to a pressure balancing device (100) for a mobility device, arranged at the housing (30) of an electric assistance device, the pressure balancing device (100) being formed by an opening (90) formed in the housing and protected by a membrane (905) fixed by a clip (908). Figure to be published with the abstract: 4.

Description

Title of the invention: Pressure balancing device for mobility device

[0001] The present invention relates to the field of pressure balancing devices, and more particularly a pressure balancing device for an electrical assistance device housing for a mobility device using at least one electric propulsion, and for example an electrically assisted bicycle.

[0002] For its proper functioning, the electric assistance device is placed in an oil-type fluid. One effect of the presence of this fluid is the increase in pressure in the housing, caused either by the heating of the fluid or by natural variations in external pressure, in particular due to altitude. It is therefore necessary to evacuate this excess pressure while preventing oil from escaping or dust from entering the housing.

[0003] It is known to use engine pressure balancing devices for motor vehicles. The disadvantage of these prior art devices is that they are not intended to be used in any position, and are therefore not usable in mobility devices such as, for example, electrically assisted bicycles.

[0004] Indeed, an electrically assisted mobility device may, in certain cases, be in positions other than the standard rolling position, that is to say the position where the opening of the device is above the liquid level, so that the oil cannot escape from the housing. For example, during repair or transport, the device may be placed upside down or lying on its side, and in this case the known devices can no longer play their role of pressure balancing because they are immersed in the oil. In addition, this leads to oil leaks through the device itself.

[0005] The present invention therefore aims to overcome one or more of the drawbacks of the devices of the prior art by proposing a pressure balancing device suitable for all mobility devices.

[0006] For this purpose, the present invention proposes a pressure balancing device for a mobility device, arranged at the level of the housing of an electric assistance device, the pressure balancing device being formed by an opening formed in the housing and protected by a membrane fixed to the housing by a clip.

[0007] The clip system allows the membrane to be removed or installed quickly and easily.

[0008] According to one embodiment of the invention, the membrane is arranged at an external face of the housing so as to cover the entire opening of the housing.

[0009] According to one embodiment of the invention, the clip is inserted into the opening of the housing.

[0010] According to one embodiment of the invention, the clip has a passage in its center.

[0011] According to one embodiment of the invention, the seal between the housing and the membrane clip is achieved with a circular seal arranged between the clip and the edge of the opening of the housing.

[0012] According to one embodiment of the invention, the pressure balancing device is arranged at one or other of the ends of the shaft.

[0013] The invention also relates to a mobility device, in particular an electrically assisted mobility device, comprising a pressure balancing device according to the invention.

[0014] According to one embodiment of the invention, the machine is an electrically assisted bicycle.

[0015] Other aims, characteristics and advantages of the invention will be better understood and will appear more clearly on reading the description given below, with reference to the appended figures, given by way of example and in which: - [Fig.l] is a view of a mobility device according to one aspect of the invention, - [Fig.2] illustrates the transmission assembly of the mobility device of the [Fig.l], - [Fig.3] is an elevation view along a first face of the interior of the housing of the transmission system according to the invention, - [Fig.4] is a sectional view of a pressure regulating device according to the invention.

[0016] [Fig.l] illustrates a mobility device 1 according to one aspect of the invention. The device 1 is here an electrically assisted bicycle comprising an electric motor 2. The electric motor 2 is arranged to provide part of the propulsion of the device. It comprises at least one hollow shaft 96 and bearings 97 arranged at each end 96 of the shaft, as well as a rotor and stator.

[0017] The bicycle comprises at least two wheels 3, 3' to which a driving force is supplied, by means of two pedals rotating around a crankset axle of axis Xp [Fig.2] which drives the rear wheel for example by a chain, or any other means of transmission during its use.

[0018] The machine 1 also comprises a control unit 4 as well as several sensors 5, 5', 5”, located for example at the level of the pedals, on the frame of the bicycle or at the level of a wheel 3, 3'.

[0019] The machine 1 shown here also comprises an energy storage device under form of a battery 6, a lighting system 7, a pedal board 8 with an Xp axis [Fig.2], a location and / or navigation system 40 as well as a human-machine interface system 41 comprising in particular a touch screen capable of displaying information for and / or taking into account the requests of said user. The human-machine interface system 41 is in particular connected to the location system 40 and serves as a navigation interface. The invention is not limited to a particular human-machine interface system, and may comprise any system known to those skilled in the art.

[0020] The wheels 3, 3' are equipped with a braking system 31, including in particular disc brakes 32.

[0021] The machine 1 comprises an electric assistance device and for example a transmission assembly 10 illustrated [Fig.2]. The transmission assembly 10 comprises a speed change device 20 according to the invention and the electric motor 2 to provide part of the power for the propulsion of the machine 1.

[0022] According to one embodiment of the invention, the electric assistance device is at least partly housed in a housing 30 here positioned at the level of the pedal assembly 8 whose axis Xp coincides with the output axis Xv of the speed change device 20.

[0023] [Fig.3] [Fig.3] illustrates according to a first face 100 in detail the housing 30 of mobility device 1 of [Fig.l].

[0024] The housing 30 of the gear change assembly comprises a casing 301 delimiting a first housing 302 arranged to house the gears of the gear change device 20. The casing 301 also delimits several other housings, distinct from one another. The housings 303, 304, 305, and 306 are arranged to house respectively the electric motor 2, the reducer, the gear change actuator and the control unit of the mobility device. The housing 30 is sealed.

[0025] In the context of the invention, oil or any equivalent liquid is placed in the housing. This oil is necessary for the operation of the gears of the speed change device.

[0026] In certain cases, for example during use or depending on the storage areas of the bicycle, the temperature of the oil increases, which increases the pressure in the first housing 311.

[0027] In the context of the invention, to regulate the pressure inside the housing 30, the housing comprises a pressure balancing device 100 illustrated [Fig.4].

[0028] The first face 101 is closed by a cover not visible in these figures.

[0029] According to an embodiment of the invention, the second face 200 of the housing, i.e. the one opposite the first face 101, comprises at least one casing opening 90 at the level of the housing 303 of the visible electric motor 2 [Fig.4]. More precisely Specifically, the housing has a casing opening 90 at the end 99 of the shaft 96 of the electric motor 2.

[0030] In the context of the invention, this casing opening 90 is closed by the pressure balancing device 100. In the context of the invention, the pressure balancing device is formed by a membrane 905 arranged at an external face 907 of the housing so as to cover the entire opening 90 of the housing.

[0031] In the context of the invention, the membrane is fixed to the housing by a clip 908. The clip 908 is inserted into the opening 90 of the housing. The clip has in its center a passage 909 allowing the circulation of gas, and for example air, from the inside to the outside of the housing and vice versa.

[0032] According to one embodiment, the clip 908 comprises a housing 910 receiving the membrane 905. The membrane is fixed in this housing 910.

[0033] The clip system allows the membrane to be removed or installed quickly and easily.

[0034] According to one embodiment of the invention, the membrane 905 is a gore-tex® membrane.

[0035] Thus, during a situation which will increase the pressure in the housing, or decrease it, the pressure balance is achieved thanks to the pressure balancing device 100. The gas escapes or penetrates through the membrane 905 while the oil is blocked.

[0036] According to one embodiment of the invention, the seal between the housing and the clip 908 of the membrane is achieved with a circular seal 904 disposed between the clip 908 and the edge of the opening 90 of the housing. This makes it possible to prevent leaks and to maintain good lubrication of the engine,

[0037] According to one embodiment of the invention, the pressure balancing device is arranged at one or other of the ends of the shaft 96. This makes it possible to adapt the device according to the environment of the housing so that it remains accessible.

[0038] The invention also relates to a mobility device comprising a pressure balancing device 100 according to the invention, and for example an electrically assisted bicycle.

[0039] The scope of the present invention is not limited to the details given above and allows embodiments in many other specific forms without departing from the scope of the invention. Therefore, the present embodiments should be considered by way of illustration, and may be modified without departing from the scope defined by the claims.

Claims

Claims

1. Pressure balancing device (100) for a mobility device, arranged at the housing (30) of an electric assistance device, the pressure balancing device (100) being formed by an opening (90) formed in the housing and protected by a membrane (905) fixed to the housing by a clip (908).

2. A pressure balancing device (100) according to claim 1, wherein the membrane (905) is disposed at an outer face (907) of the housing so as to cover the entire opening (90) of the housing.

3. Pressure balancing device (100) according to one of claims 1 to 2, wherein the clip (908) is inserted into the opening (90) of the housing.

4. Pressure balancing device (100) according to one of claims 1 to 3, in which the clip comprises a passage (909) in its center.

5. Pressure balancing device (100) according to one of claims 1 to 4, in which the seal between the housing and the clip (908) of the membrane is achieved with a circular seal (904) disposed between the clip (908) and the edge of the opening (90) of the housing.

6. Pressure balancing device (100) according to one of claims 1 to 5, arranged at one or other of the ends of the shaft (96).

7. Mobility device (1), in particular electrically assisted mobility device, comprising a pressure balancing device (100) according to one of claims 1 to 6.

8. Mobility device (1) according to claim 7, wherein the device (1) is an electrically assisted bicycle.

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