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WO1990011920A1 - Suspension de ski pour motoneiges - Google Patents

Suspension de ski pour motoneiges Download PDF

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Publication number
WO1990011920A1
WO1990011920A1 PCT/SE1990/000210 SE9000210W WO9011920A1 WO 1990011920 A1 WO1990011920 A1 WO 1990011920A1 SE 9000210 W SE9000210 W SE 9000210W WO 9011920 A1 WO9011920 A1 WO 9011920A1
Authority
WO
WIPO (PCT)
Prior art keywords
ski
shock absorber
hinge point
spring
cylinder
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.)
Ceased
Application number
PCT/SE1990/000210
Other languages
English (en)
Inventor
Sven-Åke AHLSTRÖM
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
Application filed by Individual filed Critical Individual
Publication of WO1990011920A1 publication Critical patent/WO1990011920A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B62M27/00—Propulsion devices for sledges or the like
    • B62M27/02—Propulsion devices for sledges or the like power driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B17/00—Accessories or details of sledges
    • B62B17/02—Runners
    • B62B17/04—Runners resiliently suspended
    • 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
    • B62M27/00—Propulsion devices for sledges or the like
    • B62M27/02—Propulsion devices for sledges or the like power driven
    • B62M2027/026—Snow mobiles characterised by the suspension means

Definitions

  • the present invention relates to a ski suspension for snowmobiles or other ski-mounted vehicles with at least one rotatable steering spindle, said ski suspen ⁇ sion comprising a shock absorber which is associated with spring means and which consists of a piston-cylin ⁇ der mechanism whose one end is hingedly connected with a ski at a first, fixed hinge point and whose opposite end is hingedly connected with a pivotable link at a second, movable hinge point, said link being hingedly connected with the ski at a third, fixed hinge point as well as with the steering spindle, optionally by means of a fastener associated therewith, at a fourth, movable hinge point, the link, when pivoting downwardly about said third hinge point under a downwardly directed load on the vehicle, causing a shortening of the piston-cy ⁇ linder mechanism and a compression of the spring means.
  • the requisite spring means consists of a curved leaf spring which has its two opposing ends connected with the ski and with which the steering spindle, or a fastener mounted thereon, is con- nected at a point located approximately in the middle of said curve on the upper side thereof.
  • Such leaf springs are, however, ill-suited for cross-country driving. Al ⁇ though the resilience and the steering quality obtainable with these springs are quite acceptable for driving at medium speeds on flat ground, that is not the case in rough and difficult terrain of the type prevalent, for in ⁇ stance, when the vehicle is used for forestry work, and, consequently, also slow driving becomes jerky.
  • McPherson suspension is that it can only be mounted on a newly-made chassis especially adapted therefor, and not on a conventional chassis with simple steering spindles for the skis. In other words, it is impossible to replace the existing ski suspensions of leaf spring type, which are used on conventional snowmobiles equipped with steering spindles, by the more sophisticated McPherson suspensions.
  • US Patent Specification 3,854,541 dis ⁇ closes a ski suspension of the type mentioned by way of introduction, which per se solves the problem of mounting in that the suspension in its entirety can be mounted at one single point on the steering spindle, there being no other connections with the chassis.
  • the only shock absorber, as well as the spring associated therewith is positioned in the area in front of the steering spindle. More precisely, the shock absor ⁇ ber extends between a first, fixed hinge point situated at the front end of the ski, and a second, movable hinge point situated in the area in front of the steering spindle.
  • This position of the shock absorber and the spring entails that the ski, when moving downwardly in re- silient fashion, is given a tendency to move forwards in relation to the chassis.
  • the forwardly di ⁇ rected movement of the ski is an absolute requirement for the downwardly directed resilient movement. If this for ⁇ wardly directed movement of the ski is prevented or coun- teracted, e.g. in consequence of the ski being on an up ⁇ ward slope or, as is often the case in actual practice, in consequence of the snowmobile being driven on ground com ⁇ prising not only snow but also, for instance, gravel, pieces of wood, or the like having considerable frictional resistance, also the resilient movement will be positively counteracted and, possibly, even prevented. Summary of the invention
  • the present invention aims at eliminating the incon ⁇ veniences associated with the ski suspension known from US 3,854,541 and providing a suspension which, irrespective of the ground in question, affords satisfactory resilience and steering quality.
  • the suspension comprises, in addition to the above shock absorber, a second shock absorber posi- tioned in front of the steering spindle and connecting a front portion of the ski with said steering spindle, op ⁇ tionally by means of a fastener associated therewith, while the first shock absorber and the spring means asso ⁇ ciated therewith are positioned behind the steering spindle.
  • the first shock absorber which is connected with the steering spindle by means of the lever action type link, is positioned behind said steering spindle, a movement which is rearwardly directed in relation to the chassis will be applied to the ski when the latter is moving downwards in resilient fashion, said rearward movement not being affected by bumps in the ground in- creasing the fractional resistance.
  • the se ⁇ cond shock absorber positioned in front of the steering spindle and cooperating with the first, rear shock ab ⁇ sorber efficiently counteracts any fluttering tendency of the ski and ensures that the front portion of the ski does not dip obliquely downwards and forwards when hang ⁇ ing in the air.
  • the spring means may advanta ⁇ geously consist of a helical compression spring applied on the outside of the piston-cylinder mechanism serving as second shock absorber, more precisely between a first abutment means on the cylinder of said mechanism, and a second abutment means on the piston rod of said mechanism.
  • the spring function in the shock absorbing cylinder itself, e.g. in the form of a pneumatic spring inside said cylinder.
  • FIG. 1 is a side view of the ski suspension according to the invention
  • Fig. 2 is a similar side view on a reduced scale, show ⁇ ing the suspension mounted on the chassis of a snowmobile
  • Fig. 3 is another side view showing the ski associated with the supsension in a position suitable for reversing the snowmobile.
  • 1 generally designates the chassis of a snowmobile which, in conventional manner, comprises a steering spindle 2 for a ski 3.
  • the snowmobile has, at its front end, two parallel spaced-apart skis, but some snowmobiles, namely the ones having double driving belts, may have only one ski at the front end of the chas- sis.
  • the ski 3 may be of conventional type and consist of a compression-moulded, curved metal sheet having a broad point 4 inclined forwardly and upwardly.
  • the first shock absorber 7 which like the shock absorber 6 consists of a piston-cylinder mechanism comprising a cy ⁇ linder 9 and a piston rod 10, is, at its rear end, hinged ⁇ ly connected with the ski 3 at a first, fixed hinge point 11 and, at its opposite front end, hingedly connected with a pivotable link 12 at a second, movable hinge point 13.
  • the link 12 is hingedly connected with the ski at a third, fixed hinge point 14 and hingedly connected with the steering spindle, in this case by means of the fastener 8, at a fourth, movable hinge point 15.
  • the link 12 On its upper side, the link 12 has two separate mounting plates, a pin which forms the hinge point 15 extending therebetween.
  • two separate mounting plates are arranged on the underside of said link, a pin which forms the hinge point 13 extending therebetween.
  • the hinge point 14 consists of a pivot pin extending between two mounting plates fixedly arranged on the ski 3.
  • the first shock absorber 7 has a spring function and comprises in the em- bodiment shown a helical compression spring 16 arranged on the outside of the cylinder 9, more precisely between a first abutment member 17 on the cylinder, and a second abutment member 18 on the piston rod 10 of said mechanism.
  • an external thread 19 is arranged on the outside of the cylinder and cooperates with an analogous, internal thread on the annular abutment collar 17.
  • the spring 16 is progressive so as to provide increasing spring resistance when the degree of compression is in ⁇ creased.
  • Fig. 1 illustrates how the two opposing ends of the spring are more tightly wound than the midportion.
  • An abutment means 20 is mounted on the ski 3 and com ⁇ prises a body 21 which is made of rubber or similar, elas ⁇ tic material and against which the link 12 may be applied in a lower end position.
  • the link 12 will pivot about the two hinge points 14 and 15 when relative movements occur be ⁇ tween the ski and the chassis, e.g. when driving on rough ground.
  • the link will pivot clockwise about the hinge point 14 and, via the mounting plates for the hinge point 13, which serve as lever, will cause the piston rod 10 to move into the cylinder 9.
  • This movement is counter- acted by the helical spring 16 causing a cushioning there ⁇ of.
  • the conventional shock-absorbing function of the cylinder 9 cushions the movements of the piston rod in both directions.
  • the hinge points 14, 15 can be arranged on strong and stable mounting plates, it is, in actual prac ⁇ tice, possible to obtain a practially nonrotatable connec ⁇ tion between the steering spindle and the ski, such that an excellent steering quality of the ski is obtained, also when there are intense pivoting movements vertically re ⁇ lative to the chassis.
  • Fig. 1 illustrates how the front shock absorber 6 has been provided with a spring in the form of a progressive helical compression spring 22 which, however, can be dis-claimedd with, as is shown in Figs. 2 and 3.
  • a blocking mem ⁇ ber 23 may be connected with the front shock absorber 6 and be movable between an inactive position shown in Fig. 2 and an active position shown in Fig. 3, in which it prevents the piston rod 24 forming part of the shock absorber and occupying a certain projecting position from being pushed into the associated cylinder 25.
  • the ski 3 can be locked in the rearwardly and upwardly in ⁇ clined position shown in Fig. 3, such that the back por- tion of the ski does not dig into the snow when the ve ⁇ hicle is reversed.
  • the blocking ele ⁇ ment 23 may consist of a cross-sectionally U-shaped arm which is hingedly connected with the mounting 6' and which, if the snowmobile gets stuck, can be moved to the active position shown in Fig. 3 after the driver manually has moved the ski to the rearwardly and upwardly inclined position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Dampers (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

Une suspension de ski pour motoneiges avec au moins une fusée de direction rotative (2) comprend un ressort (16), ainsi qu'un amortisseur (6) pour assurer l'élasticité et l'amortissement des mouvements relatifs entre le chassis et un ski (3) relié avec la suspension et dirigeable au moyen de la fusée de direction (2). De plus, la suspension comporte, outre le premier amortisseur (6) positionné devant la fusée de direction, un deuxième amortisseur (7)pourvu d'un ressort hélicoïdal à compression progressive (16), et constitué d'un mécanisme piston-cylindre dont l'extrémité arrière est reliée de manière articulée avec le ski (3) au niveau d'un premier point d'articulation fixe (11) et dont l'extrémité opposée est reliée de manière articulée avec une articulation pivotante (12) au niveau d'un deuxième point d'articulation mobile (13), l'articulation étant reliée de manière articulée avec le ski au niveau d'un troisième point d'articulation fixe(14) ainsi qu'avec la fusée de direction (2) au niveau d'un quatrième point d'articulation mobile (15).
PCT/SE1990/000210 1989-04-03 1990-04-02 Suspension de ski pour motoneiges Ceased WO1990011920A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8901159A SE464291B (sv) 1989-04-03 1989-04-03 Skidupphaengning foer snoeskotrar
SE8901159-7 1989-04-03

Publications (1)

Publication Number Publication Date
WO1990011920A1 true WO1990011920A1 (fr) 1990-10-18

Family

ID=20375532

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000210 Ceased WO1990011920A1 (fr) 1989-04-03 1990-04-02 Suspension de ski pour motoneiges

Country Status (3)

Country Link
AU (1) AU5407990A (fr)
SE (1) SE464291B (fr)
WO (1) WO1990011920A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5791669A (en) * 1997-01-24 1998-08-11 Broddon; James L. Shopping cart caddy
EP1462336A1 (fr) * 2003-03-25 2004-09-29 Alain Stoll Engin de glisse sur neige
WO2020046176A3 (fr) * 2018-08-31 2020-04-23 Леонид Александрович ЖЕЛОНИН Système de contrôle de position de ski pour le déplacement d'un moyen de transport à deux roues sur la neige
CN113942353A (zh) * 2021-09-15 2022-01-18 江苏丞工科技有限公司 井下机器人用减振装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854541A (en) * 1973-03-16 1974-12-17 H Hollnagel Snowmobile ski suspension assembly with horizontal shock absorber means
US3899036A (en) * 1973-11-12 1975-08-12 Harold E Hollnagel Snowmobile ski suspension assembly
US3967692A (en) * 1974-09-26 1976-07-06 Hoffman Elmer H Snowmobile suspension system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854541A (en) * 1973-03-16 1974-12-17 H Hollnagel Snowmobile ski suspension assembly with horizontal shock absorber means
US3899036A (en) * 1973-11-12 1975-08-12 Harold E Hollnagel Snowmobile ski suspension assembly
US3967692A (en) * 1974-09-26 1976-07-06 Hoffman Elmer H Snowmobile suspension system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5791669A (en) * 1997-01-24 1998-08-11 Broddon; James L. Shopping cart caddy
EP1462336A1 (fr) * 2003-03-25 2004-09-29 Alain Stoll Engin de glisse sur neige
WO2004085223A1 (fr) * 2003-03-25 2004-10-07 Alain Stoll Engin de glisse sur neige
WO2020046176A3 (fr) * 2018-08-31 2020-04-23 Леонид Александрович ЖЕЛОНИН Système de contrôle de position de ski pour le déplacement d'un moyen de transport à deux roues sur la neige
CN113942353A (zh) * 2021-09-15 2022-01-18 江苏丞工科技有限公司 井下机器人用减振装置
CN113942353B (zh) * 2021-09-15 2023-10-24 江苏丞工科技有限公司 井下机器人用减振装置

Also Published As

Publication number Publication date
SE8901159L (sv) 1990-10-04
SE464291B (sv) 1991-04-08
SE8901159D0 (sv) 1989-04-03
AU5407990A (en) 1990-11-05

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