Compact car steering

Abstract

The invention relates to a steering system assembly (18) for a micromobility vehicle. It comprises: a steering column (22) driven in rotation via a steering wheel; steering rods associated with the steering wheels of the vehicle; a laterally movable connecting rod (28) linking the steering rods; and a drive device (30) for the connecting rod (28) to be driven by the steering column (22). The drive device (30) comprises a groove inclined (58) relative to the connecting rod and fixed to said connecting rod; and an eccentric element (60) fixed to the steering column and at a distance from the axis of rotation (62). The eccentric element (60) is engaged in the inclined groove (58) in order to transmit motion from the steering column (22) to the connecting rod (28). Figure to be published with the abbreviation: Figure 3

Description

Title of the invention: Steering of a compact motor vehicle

[0001] The invention relates to the field of steering systems for motor vehicles. The invention deals with the transmission of motion between a steering column and a connecting rod linked to the steering wheels of a motor vehicle. The invention relates to an assembly for a motor vehicle steering system. The invention also relates to a motor vehicle.

[0002] A motor vehicle includes a front axle with steering wheels connected to the structure by means of suspension systems and a steering system. In this context, each steering wheel is connected to a dedicated support that pivots about a vertical axis. Such a steering support is indirectly connected to the structure by means of suspension arms. This configuration allows for steering wheel kinematics that optimize comfort and maneuverability.

[0003] In order to operate in urban areas, vehicle size is reduced to make them compact. This reduction in dimensions is accompanied by a reduction in weight, which in turn reduces the primary energy required to power the vehicle. At the same time, such vehicles must meet reliability and simplification requirements for their mechanisms. This constraint applies particularly to steering systems.

[0004] Document FR3100789B1 describes an electric steering wheel system for a motor vehicle, comprising a steering wheel fixed to an axle, including a sensor providing information on the position of this steering wheel to control a steering gear motor, a moving element connected by a mechanical transmission to the steering wheel axle, which travels in proportion to the rotation of the steering wheel, and a device comprising two movable mechanical stops, each limiting the maximum travel of the moving element in one direction, equipped with an actuator for moving these stops. The moving element is a connecting rod carrying a rack. Thanks to this steering wheel system, the total rotation of the steering wheel is limited in each case, precisely corresponding to the wheel pivoting according to the chosen gear ratio. However, there is a need to simplify such a system while maintaining safety.

[0005] The invention aims to address at least one of the problems or drawbacks encountered in the prior art. In particular, the invention aims to simplify a motor vehicle steering system. The invention also aims to optimize the simplicity, weight, cost, reliability, and maintenance of a motor vehicle steering system.

[0006] According to a first aspect, the invention provides an assembly for a motor vehicle steering system with steering wheels, the assembly comprising: a steering column with an axis of rotation and intended to be driven in rotation via a steering wheel; steering rods intended to be associated with the steering wheels of the motor vehicle; a laterally movable connecting rod connecting the steering rods; a device for driving the connecting rod by the steering column; notable in that the driving device comprises a groove inclined relative to the connecting rod and integral with said connecting rod; an eccentric element integral with the steering column and at a distance from the axis of rotation, said eccentric element being engaged in the inclined groove in order to transmit a movement from the steering column to the connecting rod.

[0007] The invention provides a simple mechanism for transmitting steering system movements. It is based on elementary and robust shapes. Its components remain easy to mass-produce, which helps to limit costs. The configuration proposed by the invention optimizes reliability and simplifies maintenance. Service life is extended. Furthermore, the invention prevents assembly errors. Finally, the invention provides a responsive steering system for an improved driving experience.

[0008] Preferably, the assembly includes a reduction mechanism with a primary shaft intended to receive the steering wheel, and an output formed by the steering column.

[0009] Preferably, the reduction mechanism comprises a primary pinion fixed to the primary shaft and having a first set of teeth formed all around said primary pinion, an output pinion with a second set of teeth formed on half a turn of said output pinion.

[0010] Preferably, the reduction mechanism includes a reduction ratio between the primary shaft and the steering column of between 1.5 and 4.

[0011] Preferably, the assembly has a branch connecting the eccentric element to the steering column; and / or the inclined groove includes an internal width, the eccentric element comprising a cylindrical body fitted to the internal width.

[0012] Preferably, the inclined groove includes a center, the connecting bar being at said center.

[0013] Preferably, the inclined groove comprises a length between 4 cm and 15 cm.

[0014] Preferably, the inclined groove is perpendicular to the joining bar.

[0015] Preferably, the inclined groove passes through the connecting bar.

[0016] Preferably, the assembly includes a loop delimiting the inclined groove; the connecting bar includes a first section, a second section connected to the first section by said loop.

[0017] Preferably, the loop is perpendicular to the axis of rotation.

[0018] Preferably, the assembly includes angular stop means suitable for limiting the rotation of the steering column.

[0019] Preferably, the axis of rotation is under the joining bar, and at a distance from the inclined groove.

[0020] Preferably, the angular stop means comprise a disc coupled to the steering column, an angular clearance formed in the disc, a stop finger engaged in the angular clearance.

[0021] Preferably, the angular clearance extends angularly over at most 180° of the disk.

[0022] Preferably, the eccentric element is parallel to the axis of rotation.

[0023] Preferably, the angular clearance is an angular slot.

[0024] Preferably, the second set of teeth comprises at least twice as many teeth as the first set of teeth.

[0025] Preferably, the inclined groove comprises a width, the eccentric element being adjusted to said width.

[0026] Preferably, the inclined groove comprises a length between 6 cm and 12 cm.

[0027] Preferably, the gear ratio is between 1.5 and 3.

[0028] Preferably, the assembly includes a sleeve fixed to the steering column, the arm extending from the sleeve.

[0029] Preferably, the loop comprises a thickness greater than the thickness of the joining bar.

[0030] Preferably, the angular clearance extends angularly over at most 120° of the disk.

[0031] Preferably, the inclined groove is a transverse groove.

[0032] According to another aspect, the invention provides an assembly for a motor vehicle steering system with steering wheels, the assembly comprising: a steering column with an axis of rotation and intended to be driven in rotation via a steering wheel; a laterally movable connecting rod intended to connect the steering rods associated with the steering wheels; a drive device for the connecting rod; notable in that the drive device comprises a groove inclined relative to the connecting rod and integral with said connecting rod; an eccentric element of the steering column, said eccentric element cooperating with the inclined groove in order to transmit a movement from the steering column to the connecting bar. Such an assembly optimizes simplicity and reliability for a steering system.

[0033] According to another aspect, the invention proposes an assembly for a motor vehicle steering system with steering wheels, the assembly comprising: a steering column with an axis of rotation intended to be driven in rotation via a steering wheel; a laterally movable connecting rod suitable for connecting the steering rods; a device for driving the connecting rod by the steering column; remarkable in that the assembly comprises a reduction mechanism with a primary shaft intended to receive the steering wheel, and an output formed by the steering column; the drive device comprises a groove integral with said connecting rod; an eccentric element connected to the output by the steering column in order to transmit a movement from the steering column to the connecting rod.

[0034] According to another aspect, the invention proposes a motor vehicle comprising a steering system: with an assembly, a steering wheel; remarkable in that the assembly conforms to the invention.

[0035] Preferably, the motor vehicle comprises an external width of no more than 1.39 m and / or a length of no more than 2.45 m.

[0036] Preferably, the motor vehicle has a mass of at most 450 kg.

[0037] Each feature introduced by the expression "preferably" given in relation to one of the aspects of the invention applies to all other aspects of the invention.

[0038] The invention will be well understood and other aspects and advantages will become clear upon reading the following description, given with reference to the attached figures listed below.

[0039] Fig. 1 is a front view of a motor vehicle according to the invention.

[0040] Figure 2 is a top and front view of a steering wheel and a vehicle steering system reduction mechanism according to the invention.

[0041] Fig. 3 is a view from below and from the front of a drive device between a steering column and a connecting rod of a motor vehicle steering system according to the invention.

[0042] In the following description, the term "include" is synonymous with "include" and is not limiting in that it permits the presence of other elements in the motor vehicle or the assembly to which it relates. It is understood that the term "include" includes the terms "consist of". The terms "external" and "internal" shall respectively designate what is oriented towards the outside of the vehicle and towards the inside of the vehicle.

[0043] In this description, the terms "longitudinal," "longitudinally," "lateral," and "sideways" are used with respect to the vehicle's frame of reference in the mounting configuration. The term "longitudinal" refers to the vehicle's principal direction of travel. The term "lateral" refers to a direction perpendicular to the vehicle's principal direction of travel. The term "front" refers to the vehicle's principal direction of travel. The term "rear" refers to the opposite of the front of the vehicle.

[0044] The X-axis represents the longitudinal direction, the Y-axis represents the transverse direction, and the Z-axis represents the vertical direction of the motor vehicle. These three axes define a right-handed trihedron whose orientation is preserved throughout the figures.

[0045] In this description, the ranges of values ​​include the bounds that delimit them.

[0046] In this description, the terms "vertical" and "horizontal" are not to be understood in their strict sense. Indeed, they allow an inclination of at most 20°, preferably at most 10°, more preferably at most 5°, and even more preferably at most 2°; with respect to the strict meaning of these terms.

[0047] In this description, the technical characteristics are defined in the assembly mounting configuration, unless otherwise explicitly stated.

[0048] Throughout the description, the different figures use the same reference signs to designate identical or similar entities.

[0049] Figure 1 represents a motor vehicle 10, according to an embodiment of the invention. The motor vehicle 10 comprises energy storage means and at least one motor (not shown) adapted to drive said motor vehicle 10.

[0050] The motor vehicle 10 comprises a structure 12. The structure 12 forms an outer body, or the main frame of the motor vehicle. The structure 12 delineates different compartments of the motor vehicle 10, including the passenger compartment, the cargo area, and the engine compartment (not shown). The structure 12 may be formed from an assembly of stamped and welded sheet metal parts.

[0051] The structure 12 connects various parts of the motor vehicle 10, including the openings. The structure 12 forms a mounting support for the powertrain and braking systems. The motor vehicle 10 includes steering wheels 14. The steering wheels 14 pivot on their own axis to steer the motor vehicle 10. The steering wheels 14 are front wheels. They pivot according to vertical pivot axes in addition to rotating on horizontal rotation axes. The 14 steering wheels have variable steering angles.

[0052] The motor vehicle 10 includes suspension systems 16 connecting each steering wheel 14 to the structure 12. The suspension systems 16 are independent in that they allow distinct vertical movements for each steering wheel 14.

[0053] The motor vehicle 10 also includes a steering system 18. The steering system 18 comprises an assembly. The assembly includes a portion of the entities of the steering system 18 in its entirety. The steering system 18 includes a steering wheel 20. The steering wheel 20 forms a control interface for the driver. The steering wheel 20 includes a ring or side handles.

[0054] The entire steering system 18 comprises a steering column 22. The steering column 22 has a rotation axis. The steering column 22 is driven in rotation via the steering wheel 20. The steering column 22 can be segmented. For example, it may have three segments connected by two universal joints. It includes several rotation axes, including an output rotation axis. The output rotation axis is a rotation axis of the output segment, such as the segment opposite the driver. It may be a front rotation axis. In the following description, the output rotation axis will be referred to as the rotation axis.

[0055] Each steering wheel 14 is mounted on a wheel carrier 24, similar to a wheel hub. The wheel carriers 24 are associated with the suspension systems 16. They are connected to the structure 12 by suspension arms 84. The wheel carriers 24 can be steered by means of tie rods 26. Each tie rod 26 is associated with one of the steering wheels 14. The tie rods 26 include ball joints at each end. Each tie rod 26 is coupled to a steering wheel 14 of the motor vehicle, via a wheel carrier 24, in order to control its steering angle.

[0056] The steering system 18 further includes a connecting rod 28. The steering rods 26 are connected to the connecting rod 28. The connecting rod 28 is a horizontal rod. It forms a lateral rod. The connecting rod 28 is laterally movable. It slides to the sides. The connecting rod 28 links the steering rods 26 to each other. By moving laterally, it adjusts the steering angle of two steering wheels 14 simultaneously. Generally, the steering rods 26 form mechanical connections between the connecting rod 28 and the steering wheels 14.

[0057] The steering system 18 further includes a drive device 30 for the connecting rod 28 via the steering column 22. The drive device 30 allows the transverse position of the connecting rod 28 to be indexed according to the angular position of the steering column 22. The drive device 30 converts a rotational movement imposed by the driver into a translational movement. As an option, the steering system 18 includes an actuator that assists the movement of the connecting rod 28.

[0058] According to a preferred embodiment of the invention, the motor vehicle 10 is a compact vehicle, also called an urban vehicle. It falls into the category of "micromobility". The motor vehicle 10 has an external width 32 of at most 1.39 m and / or a length of at most 2.45 m. The external width 32 and the length are maximum dimensions. The external width 32 adds a compactness constraint to the steering system 18.

[0059] The motor vehicle 10 has a mass of at most 450 kg. It is preferably an electric vehicle, with an electric battery powering electric motors capable of propelling the motor vehicle.

[0060] The motor vehicle may, for example, be a private motor vehicle, for example a one-seater or two-seater motor vehicle. The two seats are side by side, or one in front of the other.

[0061] According to an alternative of the invention, the steering column is straight.

[0062] Figure 2 shows a steering wheel 20 connected to a steering column 22 of a steering system 18 of a motor vehicle, according to an embodiment of the invention. The motor vehicle may correspond to the one shown in relation to Figure 1. The present figure is centered on the upper, or rear, part of the steering system 18.

[0063] The steering wheel 20 has a central hub 34. It has a plurality of radial spokes connecting the central hub 34 to the perimeter hoop. The steering wheel 20 is pivotally mounted on the vehicle structure, either directly on the steering column 22 or indirectly.

[0064] The steering system 18, in this case the assembly, includes a reduction mechanism 36. The reduction mechanism 36 reduces the angle of rotation of the steering column 22 relative to that of the steering wheel 20. In return, it increases the torque generated by the driver, which makes driving easier and more precise.

[0065] The reduction mechanism 36 has a primary shaft 38, also called the input shaft. The steering wheel 20 is integral with the primary shaft 38. It is mounted on it. The reduction mechanism 36 also includes an output 40, formed by the steering column 22, such as its rear segment or upper segment.

[0066] The reduction mechanism 36 includes a primary gear 42 fixed to the primary shaft 38. The primary gear 42 has a first set of teeth formed all around said primary gear 42. The primary gear 42 has a first radius 56. The primary gear 42 is an input gear. The reduction mechanism 36 also includes an output gear 44 with a second set of teeth. The output gear 44 meshes with the primary gear 42, so the first set of teeth cooperates with the second set of teeth.

[0067] The second set of teeth is formed on, at most, half a turn of said output pinion 44. The second set of teeth comprises at least twice as many teeth as the first set of teeth. The output pinion 44 has a second radius 46 greater than or equal to twice the first radius 56 of the primary pinion 42. The first radius 56 and the second radius 46 are measured at the teeth. The radii are measured at mid-height of the teeth of the first and second sets of teeth.

[0068] The reduction mechanism 36 includes a reduction ratio between the primary shaft 38 and the steering column 22 of between 1.5 and 4; preferably, the reduction ratio is between 1.5 and 3. The reduction ratio is calculated using the second radius 46 of the primary pinion 42 and the first radius 56 of the output pinion 44.

[0069] The steering system 18, in particular the assembly, includes angular stop means 48 adapted to limit the rotation of the steering column 22. The angular stop means 48 comprise a disc 50 coupled to the steering column 22, an angular clearance 52 formed in the disc 50, and a stop finger 54 engaged in the angular clearance 52. The stop finger 54 cooperates with the angular ends of the angular clearance 52 in order to limit the rotation of the disc 50 and thus of the steering column 22. The stop finger 54 is integral with the structure. The output pinion 44 is formed by the disc 50, which improves compactness. It is formed on an angular segment. The disc 50 is locally toothed.

[0070] The angular clearance 52 extends angularly over a maximum of 180° of the disk 50, for example, over a maximum of 120° of the disk. It extends over at least 90° of the disk 50. The angular clearance 52 may be a slot extending in the circumferential direction, which strengthens the disk 50 and thus improves its rigidity. The angular clearance 52, in particular the slot, is curved. It has a constant radius around the axis of rotation.

[0071] The steering system 18 includes a fixed steering box (not shown) which receives the steering wheel 20. The steering box houses the reduction gear mechanism 36. The steering wheel 20 incorporates the airbag (not shown), for example, in its hub. The airbag, also called an airbag, is deployed by means of a pyrotechnic charge in the event of a collision. frontal. The 36 reduction mechanism is longitudinally distant from the safety cushion.

[0072] Figure 3 shows a drive device 30 for a steering system 18 of a motor vehicle, according to an embodiment of the invention. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 2.

[0073] The steering system 18 includes a drive device 30. The drive device 30 converts a rotational movement of the steering column 22 (shown in dashed lines) into a linear movement of the connecting bar 28. The connecting bar 28 is a central bar. It is a transverse bar. The drive device 30 is a manual control mechanism.

[0074] The drive device 30 comprises an inclined groove 58 with respect to the connecting bar 28 to which it is attached. The inclined groove 58 is straight. The connecting bar 28 is essentially straight. It has a principal direction along its elongation. The inclined groove 58 is inclined with respect to the connecting bar 28, particularly to its principal direction, at an angle of inclination greater than 60°, preferably greater than 80°. These angle ranges optimize the conversion of motion, particularly in both directions. In one embodiment, the inclined groove 58 is perpendicular to the connecting bar 28. In a plane perpendicular to the axis of rotation 62 of the steering column 22, the inclined groove 58 is orthogonal to the connecting bar 28. The inclined groove 58 is symmetrical with respect to a vertical and longitudinal plane.

[0075] The drive device 30 includes an eccentric element 60 fixed to the steering column 22. The eccentric element 60 is eccentric in that it is at a distance from the axis of rotation 62 of the steering column 22. This axis of rotation 62 may correspond to the axis of rotation of the output segment of the steering column 22. The eccentric element 60 is radially at a distance from the axis of rotation 62. Their spacing 64 is measured perpendicularly with respect to the axis of rotation 62. The spacing 64 is measured from the center of the eccentric element 60. The spacing 64 is greater than the diameter of the steering column 22.

[0076] The eccentric element 60 cooperates with the inclined groove 58. The eccentric element 60 is engaged in the inclined groove 58 in order to transmit a movement from the steering column 22 to the connecting rod 28. The eccentric element 60 oscillates in the inclined groove 58 in order to convert a pivoting of the steering column 22 into a translation of the connecting rod 28 in the transverse direction, in both directions. Thus, a steering wheel rotation command results in a change in steering angle.

[0077] The steering system assembly 18 has a branch 66 connecting the eccentric element 60 to the steering column 22, for example to the shaft forming the column The steering column 22. The arm 66 may be a cam. The inclined groove 58 has an internal width 68. The eccentric element 60 has a cylindrical body fitted to the internal width 68. The internal width 68 is measured along the connecting bar 28, specifically its main elongation. The combination of the steering column 22, the arm 66, and the eccentric element 60 forms a crank mechanism.

[0078] The inclined groove 58 includes a center 70. The center 70 is located at the midpoint of the length 72 of the inclined groove 58. The connecting bar 28 is positioned at said center 70. This feature limits the stresses in the drive device 30. The length 72 is between 4 cm and 15 cm; preferably between 6 cm and 12 cm. These dimensions optimize operating precision and robustness. The length 72 is measured in a plane perpendicular to the axis of rotation 62.

[0079] The inclined groove 58 is a transverse groove. It intersects the connecting bar 28. The inclined groove 58 passes through the connecting bar 28. This feature contributes to the compactness since the inclined groove 58 is integrated into the connecting bar 28, which it nevertheless divides. This reduces the torsional moments in the drive device 30.

[0080] The assembly includes a loop 74 defining the inclined groove 58. The loop 74 has two parallel sides against which the eccentric element 60 slides. The loop 74 is generally rectangular or oblong. The connecting bar 28 comprises a first section 76 and a second section 78 connected to the first section 76 by said loop 74. They are, for example, a left section and a right section, respectively. The first section 76 and the second section 78 (partially shown) are parallel and symmetrical. This configuration limits the number of moving parts, and thus simplifies the design.

[0081] The loop 74 is perpendicular to the axis of rotation 62. It is formed by a ribbon. It is parallel to the arm 66. The loop 74 has a thickness 80. The thickness 80 is measured along the axis of rotation 62. The thickness 80 of the loop 74 is greater than that of the connecting bar 28. This contributes to the strength of the steering column.

[0082] The loop 74 is a simple component to produce. It provides flexibility to the connecting bar 28, allowing it to absorb certain shocks without any deformation. Furthermore, the presence of the loop 74 allows for optimization of the thickness of the connecting bar 28. Consequently, the mass is reduced.

[0083] The rotation axis 62 is under, extends under, the connecting bar 28. The rotation axis 62 is under and / or at a distance from the inclined groove 58. These aspects contribute to the compactness and simplicity of the drive device 30.

[0084] The assembly includes a sleeve 82 fixed to the steering column 22. The arm 66 extends from the sleeve 82. The sleeve 82 is fitted to the lower end of the steering column 22.

[0085] According to an alternative or option of the invention, the eccentric element comprises a trunnion; a block mounted pivoting on the trunnion and cooperating with the inner surfaces of the inclined groove.

[0086] According to an alternative of the invention, the assembly includes a cam or a disc connecting the eccentric element to the steering column.

[0087] According to an alternative of the invention, the angular stop means comprise two angularly offset pads, and a stop lever integral with the steering column and arranged between the two pads.

[0088] According to an alternative of the invention, the inclined groove is inclined relative to the connecting bar at an angle of inclination between 30° and 60°, possibly equal to 45°.

[0089] According to an alternative embodiment of the invention, the eccentric element comprises a cubic body. Preferably, the cubic body is fitted to the internal width of the inclined groove.

[0090] According to one embodiment, the sleeve 82, the arm 66 and the eccentric element 60 are made of material. They are made of metal, or made of a plastic or composite material.

[0091] According to an alternative of the invention, the eccentric element is metallic.

[0092] The invention comprises the combination of all the embodiments illustrated by all the figures.

Claims

Demands

1. Assembly for a steering system (18) of a motor vehicle (10) with steering wheels (14), the assembly comprising: a steering column (22) with a rotation axis (62) and intended to be driven in rotation via a steering wheel (20); steering rods (26) intended to be associated with the steering wheels (14) of the motor vehicle (10); a connecting rod (28) movable laterally and connecting the steering rods (26); a drive device (30) of the connecting rod (28) by the steering column (22); characterized in that the drive device (30) comprises a groove inclined (58) with respect to the connecting rod (28) and integral with said connecting rod (28);an eccentric element (60) fixed to the steering column (22) and at a distance from the axis of rotation (62), said eccentric element (60) being engaged in the inclined groove (58) in order to transmit a movement from the steering column (22) to the connecting bar (28).;

2. Assembly according to claim 1, characterized in that the assembly comprises a reduction mechanism (36) with a primary shaft (38) intended to receive the steering wheel (20), and an output (40) formed by the steering column (22).

3. Assembly according to claim 2, characterized in that the reduction mechanism (36) comprises a primary pinion (42) integral with the primary shaft (38) and having first teeth formed all around said primary pinion (42), an output pinion (44) with second teeth formed on half a turn of said output pinion (44); preferably, the reduction mechanism (36) comprises a reduction ratio between the primary shaft (38) and the steering column (22) of between 1.5

4. Cl H-. Assembly according to any one of claims 1 to 3, characterized in that the assembly has a branch (66) connecting the eccentric element (60) to the steering column (22); and / or the inclined groove (58) comprises an internal width (68), the eccentric element (60) comprising a cylindrical body fitted to the internal width (68).

5. Assembly according to any one of claims 1 to 4, characterized in that the inclined groove (58) comprises a center (70), the connecting bar (28) being at said center (70); preferably, the groove inclined (58) includes a length (72) between 4 cm and 15 P1T1

6. Cili. Assembly according to any one of claims 1 to 5, characterized in that the inclined groove (58) is perpendicular to the connecting bar (28); preferably, the inclined groove (58) passes through the connecting bar (28).

7. Assembly according to any one of claims 1 to 6, characterized in that the assembly comprises a loop (74) delimiting the inclined groove (58); the connecting bar (28) comprises a first section (76), a second section (78) connected to the first section (76) by said loop (74); preferably, the loop (74) is perpendicular to the axis of rotation (62).

8. Assembly according to any one of claims 1 to 7, characterized in that the assembly comprises angular stop means (48) suitable for limiting the rotation of the steering column (22); preferably, the axis of rotation (62) is under the connecting bar (28), and at a distance from the inclined groove (58).

9. Assembly according to claim 8, characterized in that the angular stop means (48) comprise a disc (50) coupled to the steering column (22), an angular clearance (52) formed in the disc (50), a stop finger (54) engaged in the angular clearance (52); preferably, the angular clearance (52) extends angularly over at most 180° of the disc (50).

10. Motor vehicle (10) comprising a steering system (18): with an assembly, a steering wheel (20); characterized in that the assembly conforms to any one of claims 1 to 9; preferably, the motor vehicle (10) comprises an external width (32) of at most 1.39 m and / or a length of at most 2.45 m.

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