FR3077265A1 - BICYCLE EQUIPPED WITH AN ELECTRIC MOTORIZATION ACCESSORY REMOVABLE IN A CRADLE OF THE FRAME OVERLOADING THE AXIS OF THE PEDAL - Google Patents

Abstract

The invention relates to a bicycle comprising a frame (1) generally planar (P1) having a main bearing (7a) for rotating assembly of a pedal (4). The frame (1) is configured to receive an accessory (11) removable electric motorization of the bicycle, which comprises a housing (12) housing an electric motor and a reserve of electrical energy. The housing (12) is installable on the frame (1) being housed inside a cradle (21) which is delimited between at least two profiles (6a, 6b) of the frame (1) which are converging towards the main bearing (7a). The housing (12) is jointly fixable on the converging profiles overhanging the main bearing (7a) which is formed in the convergence zone (Z1) of said converging profiles.

Description

Bicycle equipped with an electric motorization accessory removably mounted in a cradle of the frame overhanging the crank axle.

The present invention relates to the field of bicycles equipped with an electric motor assisting its propulsion. The invention relates more specifically to bicycles equipped with such an accessory which is removably mounted on the frame of bicycles.

Bicycles are well known vehicles which are powered mainly by human power provided by the cyclist. Bicycles typically comprise a frame which is formed from sections integral with each other and on which wheels are mounted, including a front wheel via which the cyclist steers the bicycle and a rear drive wheel.

The muscular propulsion of bicycles by the cyclist is typically carried out via a crankset which is connected to the rear wheel by a transmission mechanism. Such a transmission mechanism associates in particular at least one driving toothed wheel which is mounted on the crankset and which is connected via a chain to at least one receiving toothed wheel mounted on the rear wheel for its drive.

The configuration of the bicycles varies according to their current use. Synthetically, it can be considered road bicycles and sports bicycles. For road bicycles, their aesthetics and / or comfort are rather favored. For sports bicycles, their robustness as well as their propulsive and / or guiding performance are rather favored.

The evolution of habits and technical progress has led to equipping bicycles, road and / or sports, with an auxiliary electric motor which allows the cyclist to selectively provide motorized assistance for the propulsion of the bicycle.

Such an electric motor comprises at least one reserve of rechargeable electric energy for supplying energy to an electric motor equipped with a control-command module for its operation. The cyclist has a control member for the selective implementation of the electric motorization which is commonly installed on the handlebars of the bicycle.

Initially, the electric motorization was integrated into the bicycle, by exploiting the profiles of the frame to accommodate the reserve of electrical energy and by installing the motor permanently on the frame, in engagement on the pedals.

More recently, electric motors have been proposed packaged in the form of a removable accessory which can be selectively installed on the bicycle by the cyclist. Such an accessory comprises a housing which houses the components of the electric motorization and which is provided with a reversible mounting means on the frame of the bicycle. The accessory is then commonly installed along one of the profiles of the frame, as it appears for example from document EP 2 731 858 (FAZUA Gmbh).

The installation on a bicycle of such a removable electric motor accessory however has several disadvantages which it is advisable to avoid, and compromises are to be found between various difficulties to be overcome. The approach taken by the present invention is notably based on the search for such compromises with regard to the difficulties which follow, mentioned by way of non-restrictive indication.

The removable nature of the accessory is particularly sought so that the cyclist can selectively install or remove the accessory easily and quickly. It is particularly expedient that the installation and / or removal of the accessory can be carried out comfortably without having any particular technical knowledge or without having to use any tool, whether specific or commercially available.

However, it is appropriate that the ease of reversibility of the installation of the accessory on the bicycle does not affect the quality of its robust and secure attachment to the frame. It is also to be taken into account that the engine must be installed in engagement with a member of the bicycle capable of propelling it, such as in particular via the pedals. It is desirable that such an engagement and its reversal can be carried out simply and avoiding to complexify the structure of the means used and that of the framework.

It is also advisable to avoid that the size and / or the implantation of the accessory on the bicycle affect the comfort of the cyclist and / or the stability of the bicycle during its progress, as well by muscular force as by motorized assistance. .

However, it is also advisable to optimize the autonomy of the electric motorization, while gathering within the same box the reserve of electric energy and the motor. This allows in particular to simplify the installation and / or removal of the accessory by avoiding subdividing it into several independent modules to be installed separately on the bicycle.

It is also advisable that the accessory is organized so that it can be installed in satisfactory conditions not only on a road-type bicycle, but also on a sport-type bicycle which is liable to undergo chaotic journeys and / or to be used. by the cyclist to perform acrobatic figures.

It is also desirable to organize structurally simple modalities of reversible junction of the accessory on the bicycle, in order not only to facilitate the reversal of the installation of the accessory on the bicycle but also to avoid inopportune weighting at best and / or instability of the bicycle when it receives the accessory, and / or again to best reduce the production costs of the bicycle and / or the accessory.

In this context, the present invention relates to a bicycle configured for the selective reception of a removable accessory of electric motor capable of providing motorized assistance for the propulsion of the bicycle.

The object of the invention is to seek satisfactory solutions to overcome the difficulties previously stated, considered in isolation or in combination.

The bicycle of the invention comprises, as conventionally, a generally planar frame which is formed from sections integral with one another. The frame comprises a main bearing for rotating mounting of a bottom bracket shaft about a main axis of rotation of the bottom bracket on the frame. In the alternative, it is specified that the main axis of rotation is typically oriented parallel to the ground rolling plane of the bicycle, the crankset constituting a drive member for a rear wheel mounted on the frame via a transmission mechanism.

The frame is more specifically configured to receive a removable electric motorization accessory. Said accessory comprises a housing housing the components of an electric motorization module, including an electric motor supplied with energy by a reserve of electric energy. A distal end of an output shaft of the motor, emerging from the housing, is provided with a drive member which is in particular intended to be mechanically connected to the pedals.

Preferably, the motor is equipped with a geared motor and a control-command member for its operation, and the reserve of electrical energy is rechargeable. The implementation of the accessory is in particular placed under the dependence of a control member maneuverable by the cyclist to activate or deactivate the accessory. The control member is for example installed on a handlebar of the bicycle to be easily accessible by the cyclist.

The housing is reversibly fixed to the frame, via at least one fixing member placed jointly in engagement on the frame and on the housing. The reversibility of the mounting of the box on the frame thus allows the cyclist to install or remove the accessory from the bicycle before its use.

In this context, the aim of the invention is achieved by applying the following provisions, considered in isolation or in combination.

The bicycle of the invention is essentially recognizable in that the housing can be installed on the frame while being housed inside a cradle which is delimited between at least two profiles of the frame which converge towards the main bearing. The housing can be fixed jointly on said converging profiles via said fixing members, overhanging the main bearing which is formed in the convergence zone of said converging profiles.

More specifically, the converging profiles include at least one front profile and one rear profile, which can be individually segmented into several profile sections. The front profile extends in particular from a guide profile of the bicycle on which are mounted at the top said handlebar and at its base a front wheel of the bicycle. The rear section extends in particular from a saddle section on which is mounted a saddle fitted to the bicycle.

The front section and the rear section converge towards the main bearing receiving the bottom bracket, their lower ends being integral with one another in the convergence zone of the converging sections providing the main bearing. In other words, the front profile and the rear profile converge towards the bottom of the frame, said zone of convergence of said profiles converging forming a common block through which the main bearing is formed. The cradle receiving the accessory is thus delimited between at least a lower part of the converging profiles, front and rear, including their convergence zone.

The accessory may extend essentially in a plane corresponding to the overall plane of extension of the frame, between the converging profiles to the zone of convergence of the converging profiles. The accessory can thus be installed inside the cradle, extending essentially along the plane of the frame and being arranged between the profiles converging overhanging the main bearing as close as possible thereto.

The accessory is installed on the frame in a location allowing to limit a loss of stability of the progressing bicycle which can be affected by the presence of the accessory on the frame. The handling and / or guiding of the bicycle are favored, which is particularly advantageous in the context of sports use of the bicycle. The accessory is advantageously adaptable according to the various potential architectures of a bicycle frame, in particular those recently appeared on the market.

The attachment of the accessory to the frame can be obtained firmly from a distribution of the fastening members around the housing at a distance from each other according to its general plan of extension. The engagement of the fixing members on the frame can be carried out individually via each of the converging profiles and collectively on their convergence zone.

The mounting and / or removal of the accessory on the frame is carried out from a mounting direction oriented perpendicular to the plane of the frame. The execution of such mounting and / or removal operations is made easy and the stability of the maintenance of the accessory on the frame is reinforced.

The fasteners can be oriented, or in other words extend, perpendicular to the plane of the frame, which facilitates their positioning on the bicycle in said mounting direction by providing effective support of the accessory on the frame from its natural support by pinout.

The fasteners passing through the housing perpendicular to the plane of the frame are then configured as an accessory support pin on the frame against gravity. The clamping force of the housing on the frame can thus be limited by being just sufficient to prevent an escape of the accessory perpendicular to the plane of the frame.

The volume occupied by the housing inside the cradle can be increased without causing any particular discomfort for the cyclist installed on the bicycle, which in particular makes it possible to increase the space reserved for the reception of the energy reserve at l inside the housing to optimize the storage capacity of the energy reserve and thus increase the operating autonomy of the accessory.

The energy reserve is preferably composed of several electric modules electrically connected to each other, the housing can have a volume capable of receiving a substantial number of said electric modules. The number of electrical modules installed inside the box can be chosen during the manufacture of the accessory and / or by the cyclist depending on the use of the bicycle. For example, in road use mode of the bicycle, the number of electric modules can be optimized to promote the autonomy of the energy reserve. For example, in the sporty use mode of the bicycle, the number of electric modules can be reduced to limit the mass of the accessory and thus promote the maneuverability of the bicycle.

The organization of the transmission of movement to the crankset from said drive member is simplified, from advantageously parallel orientations of the distal end of the motor output shaft and the main axis of rotation of the crankset . A structurally simple transmission device can be used for this purpose, while providing support on the frame of the distal end of the motor output shaft to avoid buckling and / or to help maintain the accessory on the framework.

The transmission device may for example comprise a belt or a chain arranged along the plane of the frame and connecting the bottom bracket shaft and the distal end of the output shaft of the motor, in particular via a bushing mounted to rotate on the frame and housing the distal end of the motor output shaft while being driven by the drive member.

Thus more particularly according to one embodiment and in the station for installing the accessory on the frame, the distal end of the motor output shaft is oriented parallel to the main axis of rotation while being mechanically connected to the crankset remote from it via a transmission device. Such a transmission device is advantageously able to extend essentially along the extension plane of the accessory and of the frame to promote the stability of the bicycle.

According to one embodiment, the transmission device is integral with the frame independently of the installation of the accessory on the bicycle and participates in the maintenance of the accessory on the frame via the distal end of the output shaft of the engine. housed in a secondary bearing of the frame.

According to one embodiment, the transmission device comprises a socket which is mounted to rotate on the frame via a secondary bearing about a secondary axis of rotation which is oriented parallel to the main axis of rotation. The sleeve is cooperating with said drive member in the installation station of the accessory on the frame, being rotatable by the motor inside the secondary bearing via the drive member and being connected to the crankset via at least one mechanical transmission member. Such a mechanical transmission member between the socket and the crankset is for example arranged in a gear train and / or toothed wheels, and / or in a flexible member closed in a loop configured as a smooth belt or a notched belt placed jointly in engagement on the bushing and the crankshaft via teeth with which they are each provided.

More specifically according to one embodiment, the bushing comprises, along the secondary axis of rotation, a recess for receiving the distal end of the output shaft of the motor and a fitting member cooperating with said drive member arranged in training polygon.

The drive polygon is preferably of cruciform conformation to optimize the quality of the drive in rotation of the sleeve by the drive member, via the nesting member which it comprises in its internal recess. It is not however to exclude other potential geometries of the training polygon, such as in a triangle or in a square for example.

The arrangement of the drive member in a drive polygon makes it possible to simplify the arrangement of the distal end of the motor output shaft via which the bottom bracket shaft is rotated, and to simplify the modalities of engagement between the engine and the transmission device. The installation methods of the accessory on the frame are facilitated while providing an effective engagement of the drive member with the crankshaft via a structurally simple transmission device.

More particularly according to one embodiment, the transmission member is essentially disposed in the plane of the frame which is oriented perpendicular to the ground travel plane of the bicycle.

According to one embodiment, the transmission member is advantageously formed of at least one flexible transmission member closed in a loop on itself and mounted jointly on the socket and on the crankshaft. The flexible member is capable of being formed of a smooth belt, or preferably of a toothed belt or of a chain cooperating with teeth formed respectively on the sleeve and on the bottom bracket shaft.

Such teeth are for example formed of toothed members attached to the bushing and to the bottom bracket shaft, potentially by welding or by mechanical assembly. For example again, the teeth are formed by shaping the socket and / or the bottom bracket shaft. Such shaping can for example be carried out by machining, by deformation or by molding and / or overmolding during the manufacture of the sleeve and / or the bottom bracket shaft.

According to a possible but less advantageous variant, the mechanical transmission member is potentially formed by a train of cooperating pinions comprising at least one driving pinion mounted on the sleeve and a receiving pinion mounted on the crankshaft.

According to one embodiment, the mechanical transmission device, or at least the mechanical transmission member, is potentially protected from the external environment by at least one casing mounted on the frame. Such a casing is capable of enveloping the mechanical transmission device by including, through it, a passage window of the distal end of the output shaft of the motor to allow it to be brought into cooperation with the socket.

According to one embodiment, the box is fixed to the frame via the fixing members at several fixing points distributed on the box and on the frame, according to a triangulated system oriented in the plane of the frame.

Such a triangulated system reinforces the junction between the frame and the accessory on which the fixing members are placed in engagement at distant fixing points according to their extension planes, in particular on the one hand in their vertical directions and on the other share along their longitudinal directions of extension which are oriented from front to back with regard to the propulsion direction of the bicycle.

More particularly, the attachment points are preferably distributed at least in a substantially equilateral triangle and comprise at least attachment points respectively front and rear individually assigned to said converging profiles and a median attachment point assigned to the convergence zone of said converging profiles sparing the main landing. The fixing members may preferably be of the elastically deformable interlocking type while providing a robust attachment of the accessory to the frame via the triangulated system. It is understood that fasteners of another type can be used without departing from the rules of the invention, such as for example quick couplings or bolts.

More particularly, the fixing members extend perpendicular to the plane of the frame. The fastening members thus form pins for supporting the accessory in the plane of the frame and retaining members for the accessory perpendicular to the plane of the frame.

The fixing members preferably combine a male member and a female member cooperating by elastic deformation of at least one of them. The male member then forms said pin and the female member forms said retaining member as a result of its cooperation with the male member. According to one embodiment, the fixing members are mounted in joint engagement on the frame and on the housing via fixing lugs which they comprise respectively. According to a variant, at least one of the female member and the male member are respectively secured indifferently to the frame and / or the housing.

The reversible mounting of the accessory on the frame implies cooperation between them making it possible to recognize a bicycle of the invention on the basis of characteristics specific to each of the frame and the accessory. This will recognize a bicycle according to the invention in that it comprises a frame capable of receiving an accessory according to the invention.

Thus, the frame of a bicycle according to the invention comprises a cradle delimited between two said profiles converging while being delimited overhanging the main bearing. In this context and according to one embodiment, the converging profiles are individually each equipped with at least a first fixing lug and are equipped with at least a second fixing lug in their convergence zone providing the main bearing.

The fixing lugs spare said fixing points and are configured as a receiving member of a said fixing member oriented perpendicular to the plane of the frame. The fixing lugs are for example arranged in eyelets oriented along the plane of the frame, being able to be crossed by a male member of the fixing member in a direction parallel to the main axis of rotation of the crankset.

According to one embodiment, the frame incorporates a said transmission device essentially oriented along the plane of the frame and extending from a said secondary bearing which is arranged near and overhanging the convergence zone of the converging profiles and which is configured as a receiving member of a rotating shaft. If necessary specify, such a rotating shaft is of course intended to be formed by the distal end of the output shaft of the motor fitted to the accessory.

More particularly, a sleeve is housed freely rotating inside the secondary bearing and is provided with an interlocking member configured as a polygon. The socket is equipped with at least one mechanical transmission member connecting it to the pedal shaft.

The frame of the bicycle is capable of detachably receiving said accessory, which can be quickly and easily installed inside said cradle to selectively equip the bicycle with an electric motor assisting in its propulsion.

According to the invention, an accessory for electric motorization of a bicycle according to the invention comprises a said generally planar housing which is arranged in a polygon, the angles of which are preferably smoothed. The housing houses at least one electric motor and a reserve of electric energy, preferably rechargeable, connected to the motor for its supply of electric energy. One of the walls of the housing has a window extending along the overall plane of the housing, through which window a distal end of a said motor output shaft is capable of emerging from the housing perpendicular to its overall plane. The housing comprises members for receiving said fixing members, which are distributed around its periphery along its overall plane.

The polygonal conformation of the housing is advantageously adaptable according to the conformation of the cradle of the frame of the bicycle inside which it is intended to be housed.

According to one embodiment, the housing has fixing lugs distributed at its periphery along its extension plane and capable of receiving said fixing members. The fixing lugs are for example arranged in an eyelet oriented along the plane of the housing, being able to be crossed by a male member of a fixing member in a direction parallel to the axis of rotation of said rotating shaft or in other words a direction perpendicular to the plane of the housing and / or of the window that it comprises to allow the emergence of said rotating shaft outside the housing.

More particularly, said fixing members each comprise said male member cooperating with a female member, at least one of the male member and of the female member being potentially removably mounted on the housing.

More particularly still, the fixing lugs are distributed over the housing by delimiting between them along the plane of the housing a polygon, triangle in particular, of which they respectively form the vertices.

Thus in accordance with the invention, the frame of the bicycle and the accessory are cooperating means which can be recognized in isolation as they have just been described and the cooperation of which identifies the invention. Such recognitions isolated from the frame and / or from the accessory are specified so as to recognize the invention if necessary in the absence of mounting of the accessory on the frame of the bicycle.

An exemplary embodiment of the present invention will be described in relation to the figures of the appended plates, in which:

-) Figures 1 to 3 are illustrations of a bicycle whose frame is arranged for the reception of a removable accessory of electric motor according to the invention, the bicycle being shown in perspective in Figure 1 and Figure 3 and from the side according to the general plan of extension of the frame in FIG. 2,

-) Figures 4 and 5 are illustrations of a removable electric motor accessory arranged to be mounted on the frame of the bicycle illustrated in Figures 1 to 3, the accessory being shown in Figure 4 according to its general plan d extension and in FIG. 5 in profile perpendicular to its plane,

-) Figures 6 to 8 are details of the frame of the bicycle shown in Figures 1 to 3, illustrating a cradle of the frame in which the removable accessory shown in Figures 4 and 5 is installable as shown in Figure 8,

-) FIG. 9 is an illustration of methods for driving a pedal unit of the bicycle by the accessory shown in FIGS. 4 and 5.

The figures and their detailed descriptions which follow show the invention in particular terms which are not restrictive as to the scope of the invention as defined by the claims. The figures and their detailed descriptions of an embodiment of the invention can be used to better define the invention, if necessary in relation to the general description of the invention which has just been made.

In FIGS. 1 to 3, a bicycle typically comprises a frame 1 formed from sections assembled together. A front wheel 2 and a rear wheel 3 are mounted on the frame 1, the rear wheel 3 being driven by a crankset 4 via a transmission mechanism 5 to propel the bicycle. The frame 1 essentially extends along a plane P1 defined by a longitudinal direction L1 oriented between the front and the rear of the bicycle with regard to its station progressing on the ground, and a vertical direction V1 oriented in elevation relative to the cycle plan P3 of the bicycle on the ground.

The sections include a front section 6a and a rear section 6b which converge in a convergence zone Z1 through which is formed a main bearing 7a. The bottom bracket 4 is mounted to rotate on the frame 1 via a bottom bracket shaft 4a received by the main bearing 7a, around a main axis of rotation A1 which is oriented perpendicular to the plane P1 of the frame 1.

The front section 6a connects the main bearing 7a and a handlebar profile 6c on which are mounted a handlebar 8 at its top and the front wheel 2 at its base. The rear section 6b connects the main bearing 7a and a profile to each other saddle 6d on which a saddle 9 is mounted at its top. The rear wheel 3 is connected to the frame 1 via a pair of upper 6e and lower 6'e rear wheel profiles, which are connected to the rear profile 6b and to the main bearing 7a. A suspension member 10 is subsidiarily anchored on the frame 1 and connected to the rear wheel 3 via the upper rear wheel profile 6e.

The general architecture of the bicycle illustrated and which has just been described by way of example is capable of being variously configured, and is not restrictive as to the scope of the invention defined by the claims.

The frame 1 of the bicycle is configured to receive a removable accessory 11 illustrated in FIGS. 4 and 5, in order to selectively provide motorized assistance for the propulsion of the bicycle.

The removable mounting of the accessory 11 on the bicycle allows the cyclist to install or remove the accessory 11 quickly and easily according to his wish to have or not a motorized assistance for the propulsion of the bicycle.

To this end, the accessory 11 comprises a box 12 housing an electric motorization module 13, which conventionally comprises at least one electric motor 14 and a reserve of electric energy 15 supplying the motor 14 with the electric energy necessary for the propulsion of the bicycle. The motor 14 is preferably coupled to a geared motor, the implementation of which is notably regulated via a control-command module with which it is equipped.

The implementation of the electric motorization is placed under the dependence of a control member (not shown), potentially with multiple control positions. The control member is commonly installable on the handlebars of the bicycle, preferably removably.

The electrical energy reserve 15 is preferably composed of several electrical energy storage modules 15a which are coupled together. The electrical modules 15a can alternatively be selectively operated, or even be individually installed in the housing 12 or removed by the cyclist.

In this context, the housing 12 has a generally planar conformation. The housing 12 extends in its plane P2 in a longitudinal direction L2 and a vertical direction V2 according to dimensions significantly greater than its thickness dimension E2. The housing 12 includes fixing lugs 16a-16c which are distributed around its periphery while being oriented in its plane P2 for mounting on the frame 1 via fixing members. Preferably, the box 12 incorporates a handle 20 for gripping to facilitate its transport and its handling during its installation on the frame 1.

The motor 14, preferably incorporating the gearmotor, is provided with an output shaft 17 of which a distal end 17a is intended to be mechanically connected to the bottom bracket shaft 4a. Said distal end 17a emerges from the housing 12 along a secondary axis of rotation A2 oriented perpendicular to the plane P2 of the housing 12, through a window which is formed in a wall of the housing 12 oriented along its plane P2.

The distal end 17a of the output shaft 17 of the motor 14 is disposed inside a recess 18 of the housing 12 which is formed at its base in the rear zone Z2 in the longitudinal direction L2 of extension of the housing 12 The release 18 forms in the volume of the housing 12 a chamber for protecting the distal end 17a of the output shaft 17 of the motor 14 with respect to the external environment. Said distal end 17a is provided with a drive member 19a arranged in a drive polygon, such as for example of cruciform conformation as illustrated.

In FIGS. 3 and 8, the housing 12 is configured to be installed along its plane P2 parallel to the plane P1 of the frame 1. The housing 12 and the frame 1 extend more particularly along respective planes P1, P2 which are substantially coincident , taking into account their thickness E1, E2.

More particularly visible in Figures 6 to 8, the front section 6a and the rear section 6b define between them a cradle 21, at least at their base and in their convergence zone Z1. As illustrated in FIGS. 3 and 8, the accessory 11 is installed on the frame 1 inside the cradle 21, occupying at least part of the space delimited between the converging profiles 6a before and 6b at the rear.

The thickness of the accessory 11 is substantially the same dimension as the thickness of the converging profiles 6a, 6b, at least in their lower part delimiting between them the cradle 21 for receiving the accessory 11.

The frame 1 is provided with a secondary bearing 7b receiving a bushing 22 mounted to rotate about the secondary axis of rotation A2 which is oriented parallel to the axis of rotation A1 of the crankset 4. The secondary bearing 7b is blind to the one of its axial ends and open at its other distal end to form an emergence passage of the sleeve 22 out of the secondary bearing 7b.

The secondary axis of rotation A2 is oriented parallel and substantially overhanging the main axis of rotation A1. For its rotary drive, the emerging end of the sleeve 22 outside the secondary bearing 7b is provided with a nesting member 19b cooperating with the drive member 19a which is provided with the distal end 17a of the shaft. output 17 of motor 14.

In FIG. 9 more particularly, a transmission device 23 is permanently installed on the frame 1 in order to link in rotation the distal end 17a of the output shaft 17 of the motor 14 and the pedal shaft 4a. The transmission device 23 comprises said socket 22 and a transmission member 23a connecting the socket 22 to the bottom bracket shaft 4a.

The transmission member 23a is of planar configuration, being oriented parallel to the plane P1 of the frame 1 and to the plane P2 of the housing 12 and arranged substantially in the middle zone of the frame 1 and of the housing 12 according to their thickness E1, E2. An axial space E3 of small dimension is provided between the housing 12 and the secondary bearing 7b, to receive between them the transmission member 23a which is preferably formed of a flexible transmission member closed in loop on itself, such than a belt, smooth or notched, or even a chain.

More particularly in FIGS. 6 to 8, the frame 1 is provided with fixing lugs 24a-24c oriented along the plane P1 of the frame 1. The fixing lugs 24a-24c of the frame 1 notably include upper fixing lugs 24a, 24b respectively assigned to the front section 6a and to the rear section 6b and a lower fixing lug 24c assigned to their convergence zone Z1.

The convergence zone Z1 between the converging profiles 6a, 6b, front and rear, is in particular identifiable by their zone of junction at their base. According to the example illustrated, the front section 6a forms a cross-member extending in the plane P1 of the frame 1 along its longitudinal direction L1 and its vertical direction V1 of extension. The front section 6a has at its base an elbow for its junction with the base of the rear section 6b.

The fixing lugs 16a-16c, 24a-24c respectively equipping the housing 12 and the frame 1 are arranged substantially in their middle zone according to their thickness E1, E2, or in other words according to the orientation of the main axis of rotation A1 and of the secondary rotation axis A2. When the accessory 11 is mounted on the frame 1 as illustrated in FIGS. 3 and 8, the fixing lugs 16a-16c, 24a-24c respectively equipping the accessory 11 and the frame 1 are placed in superposition two by two according to their respective plane P1, P2.

The accessory 11 is fixed to the frame 1 according to at least three fixing points F1-F3 distributed in the plane P1 of the frame 1 and in the plane P2 of the housing 12. Fixing points respectively before F1 and rear F2 are individually assigned to the said converging sections 6a, 6b front and rear. A median attachment point F3 is assigned to the convergence zone Z1 of said converging profiles 6a, 6b providing the main bearing 7a. The fixing points F1-F3 form between them a rigid triangulated system, via the frames formed by the housing 12 and the frame 1. According to the planes P1, P2 of the frame 1 and of the housing 12, the fixing points F1-F3 delimit between them a polygon configured in a triangle T1 according to the example illustrated, the vertices of which are respectively identified by the fixing points F1-F3.

The accessory 11 is mounted on or removed from the frame 1 in a mounting direction D1 oriented perpendicular to the planes P1, P2 of the frame 1 and of the housing 12. The accessory 11 is fixed to the frame 1 via fixing members (not shown) to avoid making the figures more complex.

The fixing members extend in the mounting direction D1 or in other words in directions parallel to the main axis of rotation A1 and to the secondary axis of rotation A2. The fixing members comprise in particular a male member which jointly cross the fixing lugs 5 16a-16c, 24a-24c of the accessory 11 and of the frame 1 and which cooperate with a female member retaining the accessory 11 against its breakaway according to the thicknesses E1, E2 of the frame 1 and of the accessory 11. The fixing members are for example arranged in bolts or preferably in an elastically deformable member providing an elastic fitting between the male member and the female member that they understand respectively.

Claims (11)

1Bike comprising a generally planar frame (1) (P1) which is formed from sections (6a-6e, 6'e) integral with each other and which comprises a main bearing (7a) for rotating mounting of a bottom bracket shaft (4a) around a main axis of rotation (A1) of the crankset (4) on the frame (1), the frame (1) being configured to receive a removable accessory (11) of electric motorization which comprises a housing (12) housing the components (14,15) of an electric motorization module (13), including an electric motor (14) supplied with energy by an electrical energy reserve (15), a distal end (17a) of an output shaft (17) of the motor (14) emerging from the housing (12) being provided with a drive member (19a), the housing (12) being reversibly fixable on the frame (1) via at least one fastening placed jointly in engagement on the frame (1) and on the housing (12), characterized in that the housing (12) is installable on the frame e (1) being housed inside a cradle (21) which is delimited between at least two sections (6a, 6b) of the frame (1) which converge towards the main bearing (7a), and on which converging profiles (6a, 6b), the housing (12) can be fixed jointly, via fixing members, overhanging the main bearing (7a) which is formed in the convergence zone (Z1) of said convergent profiles (6a, 6b) . 2, - Bicycle according to claim 1, characterized in that in the installation station of the accessory (11) on the frame (1), the distal end (17a) of the output shaft (17) of the motor (14) is oriented parallel to the main axis of rotation (A1) by being mechanically connected to the pedal (4) at a distance therefrom via a transmission device (23). 3. - Bicycle according to claim 2, characterized in that the transmission device (23) is integral with the frame (11) independently of the installation of the accessory (11) on the bicycle and participates in the maintenance of the accessory (11) on the frame (1) via the distal end (17a) of the output shaft (17) of the motor (14) housed in a secondary bearing (7b) of the frame (1). 4. - Bicycle according to claim 3, characterized in that the transmission device (23) comprises a socket (22) which is rotatably mounted on the frame (1) via the secondary bearing (7b) about an axis of rotation secondary (A2) which is oriented parallel to the main axis of rotation (A1), the bush (22) being cooperating with said drive member (19a) in the station for installing the accessory (11) on the frame (1) by being rotatable by the motor (14) inside the secondary bearing (7b) via the drive member (19a) and by being connected to the crankset (4) via at least one transmission member (23a) mechanical. 5. - Bicycle according to claim 4, characterized in that the sleeve (22) comprises along the secondary axis of rotation (A2) a recess for receiving the distal end (17a) of the output shaft (17) of the motor (14) and a nesting member (19b) cooperating with said drive member (19a) arranged in a drive polygon. 6. - Bicycle according to any one of claims 4 and 5, characterized in that the transmission member (23a) is essentially arranged in the plane (P1) of the frame (1) which is oriented perpendicular to the rolling plane ( P3) on the floor of the bicycle. 7. - Bicycle according to any one of claims 4 to 6, characterized in that the transmission member (23a) is formed of at least one flexible transmission member closed in a loop on itself and assembled together. on the bush (22) and on the bottom bracket shaft (4a). 8. - Bicycle according to any one of claims 1 to 7, characterized in that the housing (12) is fixed to the frame (1) via the fixing members at several fixing points (F1-F3) distributed over the housing (12) and on the frame (1), according to a triangulated system (T1) oriented in the plane (P1) of the frame (1). 9. - Bicycle according to claim 8, characterized in that the fixing points (F1-F3) are distributed at least in a triangle (T1) substantially equilateral and comprise at least fixing points (F1, F2) respectively before and rear individually assigned to said sections (6a, 6b) converging and a fixing point (F3) median assigned to the convergence zone (Z1) of said sections (6a, 6b) converging providing the main bearing (7a). 10. -Bicycle according to any one of claims 1 to 9, characterized in that the fixing members extend perpendicular to the plane (P1) of the frame (1), the fixing members forming support pins of the accessory (11) in the plane (P1) of the frame (1) and the accessory retaining members (11) perpendicular to the plane (P1) of the frame (1). 11. -Accessory (11) for electric motorization of a bicycle according to any one of claims 1 to 10, comprising a said generally planar housing (12) (P2) which is arranged in a polygon, the housing (12) accommodating at at least one electric motor (14) and a reserve of electric energy (15) connected to the motor (14) for its supply of electric energy, one of the walls of the housing (12) having a window extending along the plane ( P2) overall of the housing (12), through which window a distal end (17a) of a said output shaft (17) of the motor (14) is capable of emerging from the housing (12) perpendicular to its plane (P2 ) overall, the housing (12) comprising receiving members (24a-24c) of the fixing members which are distributed around its periphery along its overall plane (P2).