Reinforced locking system for transmission assembly and associated mobility device.

Abstract

The invention relates to a transmission assembly (10) for a mobility device comprising a gear-changing device (20) and an electric motor (2) to provide part of the propulsion power of the device (1), the assembly being housed in a casing (30), the casing having a closure system reinforced by a Fibonacci-type embossed pattern. Figure to be published with the abbreviation: 10

Description

Title of the invention: Reinforced locking system for transmission assembly and associated mobility device.

[0001] The present invention relates to the field of transmission assemblies, and more particularly to a reinforced closure system for a transmission assembly for a mobility device using at least one electric propulsion, and for example an electric-assisted bicycle.

[0002] Gearboxes for personal mobility devices are already known in the prior art. For example, patent application FR2975367 A1 discloses a gear-changing device for bicycles, the propulsion of which is provided by an electric motor. The assembly, consisting of the gear-changing device and the electric motor, is housed in a motor casing. The casing has several compartments for each of the components of the assembly. At least one closure system, such as a lid or cover, closes the compartment containing the gear-changing device. The disadvantage of these transmission assemblies is that they are noisy.

[0003] The present invention therefore aims to overcome one or more of the drawbacks of prior art devices by proposing an improved transmission assembly for mobility equipment.

[0004] To this end, the present invention proposes a transmission assembly for a mobility device comprising a gear-changing device and an electric motor to provide part of the propulsion power of the device, the assembly being arranged in a housing,

[0005] the case comprising a closure system reinforced by a raised Fibonacci pattern.

[0006] Such a reinforced closure system makes it possible to reduce vibrations and limit noise.

[0007] According to one embodiment of the invention, the relief pattern is a Fibonacci spiral.

[0008] According to one embodiment of the invention, at least a part of the outer face of the lid has a reinforcing pattern.

[0009] According to one embodiment of the invention, at least a part of the inner face of the lid has a reinforcing pattern.

[0010] According to one embodiment of the invention, the entire external face of the lid comprises a reinforcing pattern.

[0011] According to one embodiment of the invention, the entire inner face of the lid comprises a reinforcement pattern.

[0012] According to one embodiment of the invention, at least a part corresponds to more than 50% of the internal or external surface.

[0013] According to one embodiment of the invention, the closure system is reinforced by a raised reinforcement pattern on its outer surface.

[0014] According to one embodiment of the invention, the closure system is formed by a plate.

[0015] The invention also relates to a mobility device, in particular an electrically assisted mobility device, comprising a transmission system according to the invention.

[0016] According to one embodiment of the invention, the device is an electrically assisted bicycle

[0017] Other objects, features and advantages of the invention will be better understood and will become more apparent upon reading the description given below, with reference to the accompanying figures, given by way of example and in which: - Figure [1] 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 [Fig.1], - Figure 3 illustrates a cross-sectional view of part of the assembly transmission according to an alternative embodiment of the invention, - Figure 4 illustrates a cross-sectional view of part of the transmission assembly according to another embodiment of the invention, - Figure 5 illustrates a cross-sectional view of another part of the assembly. transmission according to an alternative embodiment of the invention, - Figure 6 illustrates a cross-sectional view of another part of the assembly. transmission according to another embodiment of the invention, - Figure 7 is an elevational view along a first face of the interior of the housing of the transmission system according to the invention. - Fig. 8 is an elevation view of the housing locking system of the gear-changing device according to the invention, according to one embodiment of the invention, - Figure 9 is an elevational view of the locking system for the housing of the gear-changing device according to the invention, according to another embodiment of the invention. - Fig. 10 is a view of the device's housing closure system of speed change according to the invention according to another embodiment of the invention, - Figure

[11] is an elevational view of the locking system for the housing of the gear-changing device according to the invention, according to another embodiment of the invention. - [Fig.12] is a cross-sectional view of part of the output shaft.

[0018] Figure 1 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.

[0019] The bicycle has at least two wheels 3, 3' to which a driving force is supplied, via two pedals rotating around a bottom bracket axle with axis Xp [Fig.2] which drives the rear wheel for example by a chain, or any other means of transmission during its use.

[0020] The device 1 also includes a control unit 4 and several sensors 5, 5', 5”, located for example at the level of the pedal assembly, on the frame of the bicycle or at the level of a wheel 3, 3'.

[0021] The device 1 shown herein also includes an energy storage device in the form of a battery 6, a lighting system 7, a crankset 8 with axle Xp [Fig. 2], a localization and / or navigation system 90, and a human-machine interface system 91 comprising, in particular, a touchscreen capable of displaying information and / or responding to user requests. The human-machine interface system 91 is specifically connected to the localization system 90 and serves as a navigation interface. The invention is not limited to a particular human-machine interface system and may include any system known to those skilled in the art.

[0022] The wheels 3, 3' are equipped with a braking system 31, including disc brakes 32.

[0023] The vehicle 1 comprises a transmission assembly 10 illustrated [Fig.2]. The transmission assembly 10 includes an automatic gear-changing device 20 according to the invention and the electric motor 2 to provide part of the power for the propulsion of the vehicle 1.

[0024] According to one embodiment of the invention, the device has at least two speeds.

[0025] According to a first variant of the invention, the device has 3 speeds.

[0026] According to a second variant of the invention, the device has 7 speeds.

[0027] According to one embodiment of the invention, the transmission assembly 10 is at less partly housed in a case 30 here positioned at the level of the crankset 8 whose axis Xp is coincident with the output axis Xv of the gear changing device 20.

[0028] According to one embodiment of the invention, the gear change device 20 illustrated [Fig.3] to [Fig.6] has at least 2 ratios.

[0029] According to the first embodiment of the invention, the gear change device 20 illustrated [Fig.3] has 3 ratios distributed between a first ratio called ratio no. 1 and a higher ratio called ratio no. 3.

[0030] According to one embodiment of this first variant, the gear-changing device 20 comprises a series 60 of at least 2 output gears, and more particularly three output gears with reference axis X from Fi to F3, fixed in rotation to a hollow shaft 80 [Fig. 12] and a series 50 of at least 2 input gears, and more particularly three input gears with reference axis X from FRi to FR3, arranged to rotate freely around the selection shaft 40.

[0031] According to the second embodiment of the invention, the gear change device 20 illustrated [Fig.4] comprises 7 ratios distributed between a first ratio called ratio no. 1 and a higher ratio called ratio no. 7.

[0032] According to one embodiment of this second variant, the gear-changing device 20 comprises a series 60 of at least 2 output gears, and more particularly seven output gears with axis X of reference Fi to F7, fixed in rotation to a hollow shaft 80 and a series 50 of at least 2 input gears, and more particularly seven input gears with axis X of reference FRi to FR7, arranged to rotate freely around the selection shaft 40.

[0033] According to one embodiment of the invention, the selection shaft 40 illustrated [Fig.3] to [Fig.6] houses a shuttle 41 surrounding a worm gear 21 of the speed change device 20.

[0034] The device 1 according to the invention, comprises a speed change actuator 70 arranged to move the shuttle 41 along the worm screw 21 by a helical kinematic linkage, between at least 2 positions and more particularly according to the first variant between 3 positions from Pi to P3 or according to the second variant 7 positions from Pi to P7 and engage a selected ratio.

[0035] According to one embodiment of the invention, the speed change actuator 70 comprises electrical means for moving the shuttle 41, in the form of a geared motor. This includes a motor 81 and a gearbox 82.

[0036] According to one embodiment of the invention, the geared motor also includes a pinion 22 on the axis of the worm gear 21, an intermediate pinion 22' and a pinion 22'" on the axis Xm of the motor 81. The teeth of the pinions 22, 22', 22" can be straight as illustrated or helical in a variant not illustrated.

[0037] The rotational guidance of the worm screw 21 is, for example, ensured by means of bearings at each of its ends.

[0038] According to one embodiment of the invention, the shuttle 41 is configured to, during its movement, position itself under the pinion of the selected ratio, and engage that ratio.

[0039] According to one embodiment of the invention, the gear change device 20 comprises at least one series of at least two pawls arranged one after the other along the longitudinal axis X2 of the selection shaft 40, and more particularly according to the first variant comprises three pawls 42, or 7 according to the second variant.

[0040] Thus, during a change of speed ratio, the worm gear 21 is driven in rotation by the speed change actuator 70 causing the axial movement of the nut 210 of the screw 21 which drives the shuttle 41, the shuttle 41 is positioned under the input pinion Fr, corresponding to the selected ratio i, which is then blocked in rotation by one of the pawls 42, and meshes with the corresponding output pinion.

[0041] Fig. 7 illustrates in detail, according to a first face 100, the open casing 30 of the mobility device 1 of Fig. 1.

[0042] The housing 30 comprises a casing 301 defining a first compartment 302 arranged to house the gears of the gear-changing device 20. The casing 301 also defines several second compartments, distinct from one another. The compartments 303, 304, 305, and 306 are arranged to house, respectively, the electric motor 2, the reduction gear 82, the gear-changing actuator 70, and the control unit 4 of the mobility device. The second compartments are preferably sealed, in particular the one arranged to contain the control unit 4. This first face 100 is closed by a visible cover or hood-type closure system 110 [Fig. 8] to [Fig. 11]. This closure system 110 covers the entire opening of the first face 100.

[0043] According to one embodiment of the invention, the closure system 110 is formed by a plate.

[0044] According to one embodiment of the invention, the closure system 110 includes an opening 111 for the passage of a shaft of a crankset.

[0045] According to one embodiment of the invention, the closure system 110 comprises fastening means 113 on its periphery. For example, openings allowing the insertion of screws or any other type of element allowing the closure system 110 to be fixed to the housing 30.

[0046] In the context of the invention, the closure system 110 is reinforced in at least one part by a raised Fibonacci-type reinforcement pattern 112. That is to say, the closure system 110 comprises, in at least one part, a surface area reinforced by grooves forming a Fibonacci-type pattern.

[0047] According to one embodiment of the invention, the relief pattern is a Fibonacci spiral.

[0048] Such a reinforced closure system 110 makes it possible to reduce vibrations and limit noise.

[0049] According to one embodiment of the invention, at least a part of the outer face 114 of the lid has a reinforcement pattern 112 [Fig.8].

[0050] According to one embodiment of the invention, at least a portion of the inner face 115 of the lid has a reinforcement pattern 112 [Fig.9].

[0051] According to one embodiment of the invention, at least a part of the outer face 114 and at least a part of the inner face 115 of the lid comprise a reinforcement pattern 112.

[0052] According to one embodiment of the invention, the entire external face 114 of the lid comprises a reinforcement pattern 112 [Fig. 10].

[0053] According to one embodiment of the invention, the entire inner face 115 of the lid comprises a reinforcement pattern 112 [Fig. 11].

[0054] According to one embodiment of the invention, the entire outer face 114 and the entire inner face 115 of the lid comprise a reinforcing pattern 112. That is to say, the entire lid comprises a reinforcing pattern 112.

[0055] According to one embodiment of the invention, the entire external face 114 of the lid and at least part of the internal face comprise a reinforcement pattern 112.

[0056] According to one embodiment of the invention, the entire inner face 15 of the lid and at least part of the outer face 114 comprise a reinforcement pattern 112.

[0057] According to one embodiment of the invention, at least a part corresponds to more than 50% of the internal surface 115 and / or external surface 114.

[0058] The external surface 114 is the one that is not in contact with the inside of the housing 30, as opposed to the internal surface 115 which is the one oriented towards the inside of the housing 30.

[0059] According to one embodiment of the invention, the second visible face 200 of the housing [Fig.7], that is to say the one opposite the first face 100, has at least one opening at the level of the housing 303 electric motor 2.

[0060] The scope of the present invention is not limited to the details given above and allows for embodiments in many other specific forms without departing from the field of application of the invention. Therefore, the present embodiments should be considered by way of illustration and may be modified without, however, departing from the scope defined by the claims.

Claims

Demands

1. Transmission assembly (10) for a mobility device comprising a gear-changing device (20) and an electric motor (2) to provide part of the propulsion power of the device (1), the assembly being arranged in a housing (30) characterized in that the housing comprises a closure system reinforced by a Fibonacci-type relief pattern.

2. Transmission assembly (10) according to claim 1, wherein the embossed pattern is a Fibonacci spiral.

3. Transmission assembly (10) according to claim 1 or 2, wherein at least a portion of the outer face of the cover has a reinforcement pattern (112).

4. Transmission assembly (10) according to claim 1 to 3, wherein at least a portion of the inner face of the cover has a reinforcement pattern (112).

5. Transmission assembly (10) according to claim 1 to 4, wherein the entire outer face of the cover has a reinforcing pattern (112).

6. Transmission assembly (10) according to claim 1 to 5, wherein the entire inner face of the cover has a reinforcing pattern (112).

7. Transmission assembly (10) according to claim 1 to 6, wherein at least a part corresponds to more than 50% of the internal or external surface.

8. Transmission assembly (10) according to claim 1, wherein the closure system (110) is reinforced by a raised reinforcement pattern (112) on its outer surface.

9. Transmission assembly (10) according to any one of claims 1 to 3, wherein the closing system (110) is formed by a plate.

10. Mobility device (1), in particular electrically assisted mobility device, comprising a transmission assembly (10) according to any one of the preceding claims.

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