FR3065940B1 - MOTORIZED ASSISTANCE DEVICE OF PEDAL - Google Patents

Abstract

The present invention relates to a motorized pedal assist device (100) comprising a platen (140) configured to drive a bicycle chain, a motor, and a warp gear (120) configured to increase engine torque and rotating the plate (140).

Description

Field of the invention

The field of the present invention relates to that of electric assistance bicycles. It relates particularly, but not exclusively, to the field of pedal assisted motor assistance devices comprising a deformation wave gear.

Prior art

Nowadays, different types of devices for electric-assisted bicycles are available on the market such as integrated motors either in the rear wheel or in the front wheel, or motors integrated in a bottom bracket with a planetary gear. These are housed in the lower part of the bike frame, but unfortunately have a size and weight. We aim to solve this technical problem.

Presentation of the invention

The object of the present invention is to solve all or some of the aforementioned drawbacks in the form of a motorized pedal assist device comprising: a deformation wave gear; the deformation wave gear comprising at least one deformation wave generator, a stationary member and a transmission member; the deformation wave gear is configured to increase the torque between the deformation wave generator and the transmission member; a motor; the motor comprising an inner housing defined by an inner surface and forming a frame; the frame having a stator, mounted on the inner surface and a rotor rotatable relative to the frame; the motor being configured to rotate the deformation wave generator in a driving direction and the transmission member; a tray; the tray being configured to drive a chain and be mechanically connected to the transmission member; and, a transmission shaft; the transmission shaft being configured to be mechanically connected to the plate; characterized in that the stationary member is radially fixed to the inner surface of the frame.

Thus, thanks to this arrangement, the size of the deformation wave gear is reduced.

The pedal assist device may further have one or more of the following features, taken alone or in combination.

According to one embodiment, the chassis forms a bottom bracket or a hub.

Thus, thanks to this arrangement, the motor frame can be inserted into a hub or be the hub of a bottom bracket.

According to one embodiment, the stationary element comprises an inner periphery and teeth disposed on the inner periphery of the stationary element.

According to one embodiment, the teeth of the stationary element extend radially inwardly of the stationary element.

Thus, thanks to this arrangement, the stationary element can cooperate with a part housed inside the stationary element

According to one embodiment, the transmission member comprises an inner periphery and teeth disposed on the inner periphery of the transmission member.

According to one embodiment, the teeth of the transmission member extend radially inwardly of the transmission member.

Thus, thanks to this arrangement, the transmission member can cooperate with a part housed inside the transmission member.

According to one embodiment, the transmission member is adjacent to the stationary element.

According to one embodiment, the deformation wave gear comprises a drive member; the drive member is placed inside the transmission member and / or the stationary member and comprises an outer periphery and teeth disposed on the outer periphery of the drive member; the teeth of the drive member meshing the teeth of the transmission member.

Thus, thanks to this arrangement, the deformation wave gearing allows a reduced clearance, a good transmission ratio, a compact and very light mechanism, a good torque transmission, and a coaxial rotor and a transmission shaft.

According to one embodiment, the teeth of the drive member extend radially outwardly of the drive member.

Thus, thanks to this arrangement, the drive member allows the displacement of the transmission member.

According to one embodiment, the deformation wave generator is inserted inside the drive member.

According to one embodiment: the rotor is integral in rotation with the deformation wave generator and is configured to rotate the deformation wave generator in a driving direction, and configured so that when the generator of deformation wave performs a rotational movement, the deformation wave generator moves the teeth of the drive member pressing against the teeth of the stationary member so as to cause the rotation of the transmission member; and, the stator surrounds the rotor and is integral with the frame.

According to one embodiment, the rotor comprises at least two polar arcs; said at least two polar arcs have a radial dimension of between 7 and 12 mm.

Thus, thanks to this arrangement, the pedal assisted motor assistance device can be inserted into a bottom bracket hub.

According to one embodiment, the stator comprises a phase number between 3 and 6, and preferably a phase number equal to 3, 5 or 6.

According to one embodiment, the plate is rotatably mounted and is configured to be mechanically connected to the transmission member via a first freewheel so that when the transmission member is driven by the driving member, the plate is rotated.

According to one embodiment, the transmission member comprises a first transmission portion and a second transmission portion; the first transmission part being configured to be in contact with the drive member and the second transmission portion being configured to be in contact with the first freewheel.

According to one embodiment, the first freewheel is between the second freewheel and the transmission member.

According to one embodiment, the transmission shaft is mechanically connected to the plate by means of a second freewheel so that when the transmission shaft is rotated, the plate is rotated.

According to one embodiment, the second freewheel is between the first freewheel and the transmission shaft.

According to one embodiment, the rotor is rotatably mounted on the transmission shaft.

According to one embodiment, the pedal assisted motor assistance device comprises a rotational speed measuring device; the measuring device comprises a hall effect sensor fixed to the frame and a pole wheel integral with the transmission shaft.

According to one embodiment, the pedal assisted motor assistance device comprises a wedging member; the wedging member is disposed between the stator and the transmission member so as to limit the transverse displacement of the transmission member to the stator. Other features and advantages of the invention will appear better on reading the following description of an embodiment of the invention given by way of non-limiting example.

List of Figures The invention will be better understood with the aid of the detailed description which is set forth below with reference to the drawing, in which: FIG. 1 represents an example of a bottom bracket in which the motorized assistance device of the bottom bracket 100 according to the invention is implemented; Figure 2A shows a front view of a bottom bracket; and FIG. 2B shows a view along section B-B of the bottom bracket of FIG. 2A when the motorized assistance device 100 of the invention is used.

In the following detailed description of the figures defined above, the same elements or elements fulfilling identical functions may retain the same references so as to simplify the understanding of the invention.

General principle

The present invention is intended to assist the user in his pedaling efforts. Indeed, the user, that is to say, the cyclist, must be able to turn the crank axle which drives the plate without having any stress when the assistance is not engaged.

When the pedaling assistance is requested by the applicant, a measuring device fixed on the pedal axle transmits the order to the engine to operate. The engine then engages and indirectly drives the pedal. In other words, the motorized assistance device pedal 100 allows, on the one hand, the operation of the pedal by the user without discomfort when the engine does not work, and on the other hand, an assistance in l 'effort when the engine is running.

Description of an embodiment of the invention

The motorized assist device 100, shown in Figure 1 and allowing a reduced clearance, a good transmission ratio, a compact mechanism and very light, good torque transmission, and a rotor and a coaxial transmission shaft , comprises a motor, a deformation wave gear 120, and a crankset. Thus, thanks to this arrangement, the deformation wave gear 120.

The engine is composed of a frame 101 forming a bottom bracket or hub so that it can be inserted into a hub or be the hub of a bottom bracket, a rotor 131, and a stator 133 integrated in the frame 101. This frame 101 forms an inner housing delimited by its inner surface. This inner housing is intended to receive the stator 133, mounted on the inner surface of the frame 101 and a rotor 131. The latter, that is to say the rotor 131, comprises a set of polar arches 135 having a radial dimension between 7 and 12 mm and whose number of polar arches of the set of polar arches 135 can vary depending on the number of phases, that is to say between 3 and 6, and preferably be equal to 3, 5 or 6. The rotor 131 is rotatable relative to the frame 101. Thus, the motor can rotate the deformation wave gear in a driving direction. The deformation wave gear, mentioned above comprises a transmission member 123, a deformation wave generator 127 integral with the rotor 131 and a stationary element 121 fixed radially to the inner surface of the frame 101 so as to make the gear compact deformation wave and easy mounting. Furthermore, the pedal assisted motor assistance device 100 may also comprise a wedging member 132 disposed between the stator 133 and the stationary element 121 so as to limit the transverse displacement of the transmission member 123 towards the stator 133. In particular, this arrangement makes it possible to spatially isolate the transmission member 123 from the stator 133 via the wedging member 132 which is interposed between the transmission member 123 and the stator 133 and thus to prevent the transmission member 123 does not cut the electrical connections of the stator 133. The stationary element 121, mentioned above, comprises an inner periphery and teeth 122 disposed on this inner periphery, that is to say on the inner periphery of the the stationary element 121, more precisely, the teeth 122 of the stationary element 121 extend radially inwardly of the stationary element 121 so as to it is possible to cooperate with a part housed inside the stationary element such as, for example, a deformation wave generator 127.

Like the stationary element 121, the transmission member 123, cited above and adjacent to the stationary element 121, also comprises an inner periphery and teeth disposed on the inner periphery of the transmission member 123, more specifically, the teeth 126 of the transmission member 123 extend radially inwardly of the transmission member 123 so as to cooperate with a part housed inside the transmission member 123. Moreover, for For reasons of assembly and compactness, the transmission member 123 may comprise a first transmission portion 128 and a second transmission portion 129: the first transmission portion 128 being configured to be in contact with the driving member and the transmission member. second transmission portion 129 being configured to be in indirect contact with the tray.

This piece, which can be housed inside the transmission member 123 and / or the stationary element 121 as shown in FIG. 2B for sectional view along the section BB of FIG. 2A, is a part of FIG. The drive 125 is, in fact, placed inside the transmission member 123 and / or the stationary element 121 and comprises an outer periphery and teeth 134 arranged on the periphery. external of the drive member 125 so that the teeth 134 of the drive member 125 mesh with the teeth 126 of the transmission member 123.

To do this, the rotor 131, integral in rotation with the deformation wave generator 127 as specified above, rotates the deformation wave generator 127 in a drive direction, and is configured so that when the generator deformation wave 127 makes a rotational movement, the deformation wave generator 127 moves the teeth 134 of the drive member 125 rests on the teeth 122 of the stationary element 121 so as to cause its turn the rotation of the transmission member 123.

Thus, the deformation wave gear 120 increases the engine torque between the deformation wave generator 127 and the transmission member 123 so that when the deformation wave generator 127 is driven by the engine, the Deformation wave gear increases by a set of gear described above, the torque of the motor. This torque is then transmitted to the pedal, which comprises a plate 140 and a transmission shaft 150. The latter, that is to say the transmission shaft 150, comprises a polar wheel associated with a hall effect sensor fixed to the frame 101 forms a measuring device. This measuring device measures the Hall effect in the vicinity and sends, in the form of an analog signal value and / or digital data, the rotational speed of the transmission shaft 150 to a control unit (not shown). This control unit controls the rotational speed of the engine according to the speed of rotation of the drive shaft 150 so as to provide optimal assistance to the pedaling for the user.

The plate 140 is configured to drive a chain and be mechanically connected to the transmission member 123 via a first freewheel 124. The transmission shaft 150, on which the rotor 131 is rotatably mounted, is configured to be mechanically connected to the plate 140. The plate 140 is rotatably mounted and is configured to be mechanically connected to the transmission member 123 via a first freewheel 124 so that when the transmission 123 is driven by the drive member 125, only the plate 140 is rotated. The transmission shaft 150, meanwhile, is mechanically connected to the plate 140 via a second free wheel 145, between the first free wheel 124 and the transmission shaft 150, so that when the transmission shaft 150 is rotated, only the plate 140 is rotated.

Claims (16)

A motorized assist device (100) comprising: a warp gear (120); the deformation wave gear (120) including at least one deformation wave generator (127), a stationary member (121) and a transmission member (123); the warp gear (120) is configured to increase the torque between the warp wave generator (127) and the transmission member (123); a motor; the motor comprising an inner housing defined by an inner surface and forming a frame (101); the frame (101) having a stator (133) attached to the inner surface and a rotor (131) rotatable relative to the frame (101); the motor being configured to rotate the deformation wave generator (127) in a driving direction and the transmission member (123); a tray (140); the tray (140) being configured to drive a chain and to be mechanically connected to the transmission member (123); and, a transmission shaft (150); the transmission shaft (150) being configured to be mechanically connected to the platen (140); characterized in that the stationary member (121) is radially fixed to the inner surface of the frame (101). The pedal assisted motor assistance device (100) according to claim 1, wherein the frame (101) forms a bottom bracket or hub. The powered pedestal assist device (100) according to claim 1 or claim 2, wherein the stationary member (121) comprises an inner periphery and teeth (122) disposed on the inner periphery of the stationary member. (121) 4. Motorized assistance device pedal (100) according to any one of the preceding claims, wherein the transmission member (123) comprises an inner periphery and teeth (126) disposed on the inner periphery of the organ transmission (123). The pedal assisted motor assistance device (100) according to claim 4, wherein the deformation wave gear (120) comprises a drive member (125); the drive member (125) is placed inside the transmission member (123) and / or the stationary member (121) and comprises an outer periphery and teeth (134) arranged on the periphery outer member of the drive member (125); the teeth (134) of the drive member (125) engage the teeth (126) of the transmission member (123). The pedal assisted motor assistance device (100) according to claim 5, wherein the deformation wave generator (127) is inserted inside the drive member (125). The powered pedal assist device (100) according to claim 5 or claim 6, wherein: the rotor (131) is rotationally integral with the deformation wave generator (127) and is configured to drive in rotation the deformation wave generator (127) in a driving direction and configured so that when the deformation wave generator (127) rotates, the deformation wave generator (127) moves the teeth (134) of the drive member (125) press against the teeth (122) of the stationary element (121) so as to cause the rotation of the transmission member (123); and, the stator (133) surrounds the rotor (131) and is integral with the frame (101). The pedal assisted motor assistance device (100) according to any one of the preceding claims, wherein the rotor (131) comprises at least two pole arcs (135); said at least two pole arcs (135) have a radial dimension of between 7 and 12 mm. 9. Motorized assistance device pedal (100) according to any one of the preceding claims, wherein the stator (133) comprises a phase number between 3 and 6, and preferably a phase number equal to 3, 5 or 6. The pedal assisted motor assistance device (100) according to any one of the preceding claims, wherein the plate (140) is rotatably mounted and is configured to be mechanically connected to the transmission member (123) by via a first freewheel (124) so that when the transmission member (123) is driven by the drive member (125), the plate (140) is rotated. 11. Motorized assistance device pedal (100) according to any one of the preceding claims, wherein the transmission shaft (150) is mechanically connected to the plate (140) via a second freewheel ( 145) so that when the drive shaft (150) is rotated, the tray (140) is rotated. 12. Motorized assistance device pedal (100) according to claims 10 and 11, wherein the first free wheel (124) is between the second free wheel (145) and the transmission member (123). The pedal assisted motor assistance device (100) according to claim 11 or 12, wherein the second freewheel (145) is between the first freewheel (124) and the transmission shaft (150). 14. Motorized assistance device pedal (100) according to any one of the preceding claims, wherein the rotor (131) is rotatably mounted on the transmission shaft (150). 15. Motorized assistance device pedal (100) according to any one of the preceding claims, which comprises a rotational speed measuring device; the measuring device comprises a hall effect sensor fixed to the frame (101) and a pole wheel integral with the transmission shaft (150). 16. Motorized assistance device pedal (100) according to any one of the preceding claims, which comprises a wedging member (132); the wedging member (132) is disposed between the stator (133) and the transmission member (123) so as to limit the transverse displacement of the transmission member (123) towards the stator (133).