EP0316395A1 - Motocyclette - Google Patents

Motocyclette

Info

Publication number
EP0316395A1
EP0316395A1 EP19880904595 EP88904595A EP0316395A1 EP 0316395 A1 EP0316395 A1 EP 0316395A1 EP 19880904595 EP19880904595 EP 19880904595 EP 88904595 A EP88904595 A EP 88904595A EP 0316395 A1 EP0316395 A1 EP 0316395A1
Authority
EP
European Patent Office
Prior art keywords
front wheel
axis
motorcycle
arm
arms
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19880904595
Other languages
German (de)
English (en)
Inventor
Christopher David George Watts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB878713129A external-priority patent/GB8713129D0/en
Priority claimed from GB878727900A external-priority patent/GB8727900D0/en
Application filed by Individual filed Critical Individual
Publication of EP0316395A1 publication Critical patent/EP0316395A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M23/00—Transmissions characterised by use of other elements; Other transmissions

Definitions

  • This invention relates to a motorcycle, and in the preferred embodiment provides a motorcycle which has front and rear wheels which are driven from a common engine.
  • a motorcycle comprising: a source of rotary power; and drive means coupling the front and rear wheels of the motorcycle to the source of rotary power, wherein the drive means incorporates a one way drive device whereby one wheel may turn faster than the rotational speed imposed upon it by the drive means.
  • the one way drive device permits the front wheel of the motorcycle to turn at a rotational speed greater than the rotational speed imposed upon it by the drive means.
  • This arrangement permits differential rotation of the front and rear wheels as necessitated by, for example, steering of the motorcycle.
  • the one way drive device is in the form of a sprag clutch which allows the front wheel to over-run the rear wheel when necessary.
  • the drive means comprises a constant velocity joint mounted on or adjacent the steering head of the motorcycle in such a way that the input of the CV joint is constrained to rotate about an axis fixed relative to the motorcycle frame, and the output of the CV joint is constrained to rotate about an axis fixed relative to the front forks. In this manner, drive can be transmitted to the front wheel without substantially interfering with the steering action of the motorcycle.
  • drive from the CV joint to the front wheel is via an idler gear which is mounted at the juncture of two pivotally connected arms, the first arm being constrained at the end remote from the idler gear to pivot about the axis of the output shaft of the CV joint, and the second arm being constrained to pivot at the end thereof remote from the idler gear about the axis of rotation of the front wheel.
  • the motorcycle includes a front suspension assembly mounted on the frame for pivotal movement about a steering axis, the front suspension assembly comprising: a first arm which extends from adjacent the steering axis downwardly and rearwardly to a point to the rear of the front wheel; second and third arms connected to the lower end of the first arm for pivotal movement about a common pivot axis, the second and third arms extending along respective sides of the front wheel from the pivot axis to the axis of rotation of the front wheel where they are rotatably connected to the front wheel to support the front wheel in use; and a linkage interconnecting the second and third arms with the first arm, said linkage including a resiliently deformable member which resiliently opposes upward movement of the front wheel relative to the chassis and means constraining the second and third arms to move conjointly as the front wheel moves up and down relative to the chassis in use whereby the axis of rotation of the wheel at all times remains parallel to the p vot axis.
  • the front arm preferably comprises two rigidly interconnected members spaced apart one on either side of the longitudinal central plane of the front wheel.
  • the linkage may then comprise a wishbone pivotally connected to the members of the first arm to provide a pair of forwardly extending legs having terminal ends which respectively overlie the second and third arms, and a single rearwardly extending leg.
  • Each forwardly extending leg is connected to the one of the second and third arms which it overlies by a rigid strut, and the rearwardly extending leg is coupled to the lower end of the first arm by a spring damper.
  • This arrangement has the advantage that the characteristics of the suspension may readily be varied by altering the length of the struts, and/or the position of the interconnection between the struts and the second and third arms.
  • first arm comprising spaced apart members
  • a wishbone as described above enables the periphery of the wheel to enter the zone between the members of the first arm in the extreme upper position of the front wheel, thereby enabling a relatively compact arrangement to provide substantial front wheel travel.
  • Figure 1 is a schematic side view of a preferred embodiment of the invention
  • Figure 2 is a schematic front view of part of the embodiment of Figure 1 ;
  • Figure 3 illustrates schematically a side view of a portion of a second embodiment of the invention.
  • Figure 4 is a view in the direction of the arrow IV of Figure 1 , with the wheel partly broken away in the interests of clarity.
  • the motorcycle 1 illustrated comprises a frame 2, rear wheel 3, and front wheel 4.
  • An engine and transmission assembly 5 is mount on the frame in conventional manner and includes an output sprocket 6 which drives the rear wheel 3 via a chain 7 in conventional manner.
  • a second chain 8 is driven from the sprocket 6 and in turn drives a sprag clutch 9.
  • the output of the sprag clutch 9 drives a chain 10 which in turn drives the input shaft 11 of a constant velocity joint 12.
  • the input shaft 11 is mounted in a manner which permits it to rotate only about an axis which is fixed relative to the chassis 2.
  • the pivotal axis 13 of the constant velocity joint is located on the axis of the steering head, and the output shaft 14 of the constant velocity joint is constrained to rotate about an axis which is fixed relative to the front forks of the motorcycle.
  • a sprocket is mounted on the output shaft 14 and drives a chain 15 which in turn drives an idler wheel 16 mounted at the apex of two articulated arms 17,18.
  • the end of the arm 17 remote from the idler wheel 16 pivots about the axis of the output shaft 1
  • the end of the arm 18 remote from the idler wheel 16 pivots about the axis of rotation 19 of the front wheel 4.
  • the idler wheel 16 drives a sprocket 20 fast with the front wheel via a chain 21.
  • the bearings upon which the idler wheel 16 is mounted are contained in a variable eccentric mounting which enables the chains 15,21 to be tensioned.
  • the arrangement of the arms 17,18 enables the chain drive arrangement to accommodate the telescopic movement of the front wheel in conventional manner.
  • the motorcycle 101 comprises a chassis 102 defining a steering axis 103 about which the front suspension 104 is pivotally turned in use by means of conventional handle bars (not shown).
  • the front suspension assembly comprises a first arm 105 which extends from adjacent the pivot axis 103 downwardly and rearwardly to a point behind the front wheel 106 and substantially at the same horizontal level as the axis of rotation 107 of the front wheel, when the motorcycle is at a nominal loading.
  • the lower end 108 of the first arm defines a pivot axis 109 about which second and third arms 110,111 are pivotally mounted.
  • the front ends of the arms 110,111 are interconnected by the spindle 115 about which the front wheel rotates, and accordingly the arms 110,111 support the front wheel in use.
  • the first arm 105 comprises a pair of members 112,113 rigidly interconnected by plates 114 at the upper ends thereof, and by a suitable member (not shown) at the lower ends thereof.
  • the members 112,113 are spaced apart on either side of the central plane 116 of the front wheel 106.
  • a wishbone 117 is pivotally mounted via pivot pins 118,119 on the members 112,113 to provide a pair of forwardly extending legs 120,121 and a single rearwardly extending leg 122.
  • the legs 120,121 each terminate at a point vertically above one of the arms 110,111, and each arm 110 r 111 is connected to the overlying leg of the wishbone by a respective strut 123.
  • a combined spring and damper 124 of conventional design is located between the rearwardly extending leg 122 of the wishbone and the member which interconnects the lower ends of the members 112,113.
  • the characteristics of the suspension can be adjusted by varying the length of the struts 123 and/or the position of the point 126 along the arms 1l0 r 111 at which the struts 123 are connected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)

Abstract

Une motocyclette comprend une unité à moteur et à transmission (5) comportant un pignon de chaîne de sortie (3), relié à la roue arrière (3) par une chaîne d'entraînement (7) et à la roue avant (4) par l'intermédiaire d'un train d'entraînement constitué par une première chaîne (8), par un couplage à roue libre (9), par une deuxième chaîne (10), par un assemblage à vitesse constante (12), par une troisième chaîne (15) et par une quatrième chaîne (21). Le couplage à roue libre (9) permet à la roue avant de tourner plus vite que la roue arrière lors d'une manoeuvre de direction et l'assemblage à vitesse constante transfère les mouvements de direction depuis les éléments montés sur le châssis vers les fourches avant sans interférer avec la manoeuvre de direction de la motocyclette.
EP19880904595 1987-06-04 1988-06-02 Motocyclette Withdrawn EP0316395A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8713129 1987-06-04
GB878713129A GB8713129D0 (en) 1987-06-04 1987-06-04 Motor-cycle
GB878727900A GB8727900D0 (en) 1987-11-28 1987-11-28 Motor cycle
GB8727900 1987-11-28

Publications (1)

Publication Number Publication Date
EP0316395A1 true EP0316395A1 (fr) 1989-05-24

Family

ID=26292320

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880904595 Withdrawn EP0316395A1 (fr) 1987-06-04 1988-06-02 Motocyclette

Country Status (2)

Country Link
EP (1) EP0316395A1 (fr)
WO (1) WO1988009739A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE114568T1 (de) * 1987-02-09 1994-12-15 Franck Jean Savard Motorrad mit vorderradantrieb und lenkung mit drehstab.
FR2645107A1 (fr) * 1989-03-29 1990-10-05 Savard Franck Moto a une ou deux roues motrices et a fourche avant telescopique pendulaire
KR930000710B1 (ko) * 1989-06-28 1993-01-30 스즈키 지도오샤 코교 가부시키가이샤 전-후륜 구동모터 사이클
FR2656847A1 (fr) * 1990-01-08 1991-07-12 Savard Franck Ensemble de pieces pour permetrre a un velo d'avoir les deux roues motrices.
FR2658152A1 (fr) * 1990-02-15 1991-08-16 Biannic Jean Chistophe Dispositif de propulsion pour bicyclette a deux roues motrices et bicyclette munie de ce dispositif.
US5224725A (en) * 1990-05-10 1993-07-06 Erlston Lester J Two-wheeled-drive two wheeled vehicle
US5054572A (en) * 1990-06-20 1991-10-08 Parker James G Front wheel drive system for a motorcycle
CA2037891C (fr) * 1991-03-08 1995-08-15 Francois Chartrand Cycle comportant deux mecanismes de transmission
DE19608124C2 (de) * 1996-03-02 1998-02-19 Siegfried Hieble Motorrad mit kraftregelbarem Vorderradantrieb (Allradantrieb)
FR2772681B1 (fr) * 1997-12-22 2000-03-10 Cyrille Yves Rigo Dispositif sons forme de kit permettant de transformer une moto a une roue motrice en une moto a deux roues motrices
US6820886B2 (en) 2001-04-19 2004-11-23 Roger David Scott Goldammer Modular butt-jointed yoke for motorcycles
JP4863515B2 (ja) * 2005-02-25 2012-01-25 学校法人東京理科大学 回転伝達装置及びそれを用いた車両
US8042641B2 (en) 2009-02-09 2011-10-25 Lawson Martin E All wheel drive motorcycle
CN102745298B (zh) * 2012-07-11 2015-04-22 天津比沃科技有限公司 电动自行车的中置驱动系统
US9315233B2 (en) 2013-04-05 2016-04-19 Martin E. Lawson All wheel drive motorcycle with enhanced soft terrain capabilities

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE228336C (fr) *
DE1120300B (de) * 1956-06-21 1961-12-21 Auto Union Gmbh Vorderradfederung fuer Motorraeder
US3045772A (en) * 1959-02-17 1962-07-24 Theodore R Nicolai Drive for motor bikes
US3268025A (en) * 1963-08-20 1966-08-23 Nethercutt Ind Corp Motorcycle having two driven wheels
FR2579950A1 (en) * 1985-04-04 1986-10-10 Decouroux Robert Device for transmission to the front wheel for a motor bike with rear wheel drive or otherwise

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8809739A1 *

Also Published As

Publication number Publication date
WO1988009739A1 (fr) 1988-12-15

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