Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
  • B62K25/00—Axle suspensions
  • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
  • B62K25/12—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg
  • B62K25/14—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg with single arm on each fork leg
  • B62K25/16—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg with single arm on each fork leg for front wheel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
  • B62K25/00—Axle suspensions
  • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
  • B62K25/28—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay
  • B62K25/286—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay the shock absorber being connected to the chain-stay via a linkage mechanism

Definitions

• the object of the invention is a suspension applicable to the wheels of a motorcycle or a vehicle of the same technique.
• the invention relates more precisely to the guidance subsystem which is associated with a separate spring-damper subsystem of known type to constitute either a front suspension or a rear suspension.
• known guidance systems use one of the following solutions: the articulated quadrilateral, the swinging arm or the telescopic fork.
• the articulated quadrilateral is found in several organizations which are distinguished by the low or high part of the quadrilateral, by the suspended or unsprung character of the steering pivot, associated or integrated with one of the elements of the quadri 1 atère.
• the swingarm can be hinged to the pivot to push or pull the wheel.
• the telescopic fork exclusively uses cylindrical guides, two in number, acting in parallel, so as to materialize a prismatic connection with a certain degree of hyperstaticity.
• the quadrilateral systems in the low position and the unsprung pivot are handicapped by the difficulty of reconciling the necessary steering angle and the possible inclination of the motorcycle when cornering with the limited transverse size; moreover, the distribution of the masses of the wheel-pivot assembly is not ideal for the majority of the current phases of evolution.
• the overall stiffness of the guide mechanism is insufficient and there is also an incompatibility between the search for improvement of the guide qualities and an ideal weight distribution.
• fluctuations in the braking torque exploit the significant elasticity of the guide mechanism and cause significant variations in the bearing force which can lead, in extreme cases, to dripping and falling ⁇ ?. u pi 1 cte.
• the known guidance systems call on the following solutions: "sliding suspension", oscillating arm and, exceptionally, articulated quadrilateral. Neither of these solutions allows the longitudinal vibrations of the wheel axis to be adjusted.
• the conventional swing arm has the drawback of being hardly compatible with a power transmission by shaft.
• the suspension object of the invention comprises a guidance subsystem constituting with a suspended element a closed kinematic chain, theoretically planar, with six elements and seven rotoid connections.
• This chain is organized so that the suspended element and the element carrying the wheel materialize "binary" elements (that is to say comprising only two links) of the closed kinematic chain, on each of which is articulated a binary element and a "ternary” element (ie comprising three bonds) of the same kinematic chain.
• the suspended element, the element carrying the wheel and two intermediate elements of the closed kinematic chain constitute an open kinematic chain comprising only rotoid connections as perfect as ours.
• the suspension thus designed applies to a front wheel or to a rear wheel, it is characterized by greater freedom of design than any other known suspension: it allows first of all to choose, with a certain freedom, the trajectory of the axis of the wheel with respect to the suspended element with respect to which it is guided, and this while respecting a favorable mass distribution; this design freedom above all makes it possible to obtain, without having to use any additional element, good anti-diving and anti-rearing characteristics.
• this suspension system guides the element carrying the wheel and the brake calipers with respect to the steering pivot which, integral with the chassis, constitutes the suspended element.
• the two intermediate elements of the open kinematic chain corresponding to the most common embodiment mentioned above are ternary elements, so as to reduce the importance of the unsprung masses.
• the binary elements of the closed kinematic chain are symmetrically doubled so as to act in parallel; such an arrangement makes it possible to accommodate between the doubled elements the wheel on the one hand, and, on the other hand, the spring-shock absorber subsystem then consisting of a single spring and a single coaxial shock absorber so as to facilitate settings.
• this suspension system guides, relative to the chassis, the element carrying the wheel, the brake caliper and the drive pinion of the bevel gear, the final member of the power transmission to the wheel, when this transmission is ensured by a tree.
• the two intermediate elements of the open kinematic chain are one binary, the other ternary, so as to facilitate the installation of the guidance subsystem.
• this suspension is the only one which naturally adapts to a shaft transmission while fully preserving horizontal and vertical filtering capacities.
• Figures 1, 2 and 3 of plates 1/2, 2/2 show by way of nonlimiting examples two suspensions in accordance with
• Figure 1 of plate 1/2 shows, in isometric view, a front suspension.
• Figures 2 and 3 of the board 2/2 respectively show an elevational view and a plan view, with partial sections, of a rear suspension.
• the front wheel 1 and the brake calipers such as 2 are carried by the fork 3 which is articulated in a on the rocker arm 4 which constitutes a ternary element articulated moreover in b on the rocker 5 and in c 'and c "on connecting rods such as 6 themselves articulated in g 'and g "on the steering pivot 8
• the rocker 5, the second ternary element, is articulated at d on the pivot 8 and at e 'and e "on two connecting rods such as 7, themselves articulated at f and f" (f "not shown) on the fork 3.
• the combined shock absorber 9 is articulated, on the one hand, on the pivot 8 and on the other hand, on the rocker arm 4.
• the six theoretical elements of the closed kinematic chain are: the fork 3, the rocker arm 4, the rocker 5, the connecting rod 6 and its counterpart, the connecting rod 7 and its counterpart, as well as the steering pivot 8.
• the four elements of the open kinematic chain are the fork 3, the rocker arm 4, the rocker 5 and the steering pivot 8.
• the rotoid bonds as perfect as possible are the bonds a, b and d; the four imperfect desired connections c ', c ", e', e", f ', f "and ⁇ ', g" are for two of them
• the rear wheel 10, the brake caliper 11, and the drive pinion (not visible) are carried by the casing 12, which is articulated in h on the connecting rod 13, itself articulated in i on the balance 14 , first ternary element, articulated, on the one hand, at j on the chassis 15 (suspended element) and, on the other hand, at k on the rocker arm 16, second ternary element, itself articulated, on the one hand, at 1 on the casing 12, and, on the other hand, at m on the connecting rod 17 also articulated at n on the chassis 15.
• the spring-damper combination 18 is articulated on the one hand at p on the casing 12 and at q on the chassis 15.
• the six elements of the closed kinematic chain are the casing 12, the connecting rod 13, the balance 14, the chassis 15, the rocker arm 16, and the connecting rod 17.
• the four elements of the open kinematic chain are the casing 12, the connecting rod 13, the balance 14 and the chassis 15;
• the rotoid bonds as perfect as possible are the h, i and j bonds; the other four connections k, 1, m, n desired imperfect are for two of them k and n cylindrical guides with needles and for the other two 1 and m silentblocks on anti-friction rings.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Axle Suspensions And Sidecars For Cycles (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=9310489

Family Applications (1)

Country Status (3)

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Family Cites Families (7)

• 1984
  • 1984-12-04 FR FR8418940A patent/FR2574041B1/fr not_active Expired
• 1985
  • 1985-11-22 EP EP19850905835 patent/EP0203951A1/de not_active Withdrawn
  • 1985-11-22 WO PCT/FR1985/000329 patent/WO1986003467A1/fr unknown

Non-Patent Citations (1)

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