Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D55/00—Endless track vehicles
  • B62D55/06—Endless track vehicles with tracks without ground wheels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D11/00—Steering non-deflectable wheels; Steering endless tracks or the like
  • B62D11/20—Endless-track steering having pivoted bogie carrying track
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D55/00—Endless track vehicles
  • B62D55/06—Endless track vehicles with tracks without ground wheels
  • B62D55/07—Mono-track vehicles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D55/00—Endless track vehicles
  • B62D55/08—Endless track units; Parts thereof
  • B62D55/12—Arrangement, location, or adaptation of driving sprockets
• • 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

Definitions

• the invention relates to transmission and steering apparatus for a tracked vehicle according to the ingress part of claim 1.
• the forward driving element is a moving rubber track mat rotated by track wheels which mat moves on a slide bogie and is located under the seat. Steering of the motor sled occurs by means of a bar by turning the skis or corresponding guide means located in front of the track.
• the motor sled of this kind has as a transmission device a transmission shaft fixed to a secondary variator from one end of which tansmission shaft the torsional force is transmitted by means of a chain to the driving track wheels of the track unit.
• a motor sled which has a turning track is also known wherein the steering is accomplished by extending one side of the track and, in a corresponging way, shortening the other side.
• motor sleds with two parallel track mats which are of the same length as the sled and the steering of which occurs by decelerating the rotation of one track mat.
• a motor sled of this kind has a chain transmission to the driving wheels or the transmission shaft of the the track wheels.
• the track unit can be connected to the frame of the motor sled by shock absorbers whereby a significant improvement is obtained in the suspension of the track unit.
• the track unit can also tilt in a plane which is perpendicular to the travel direction.
• figure 1 shows a top view of the transmission apparatus of a motor sled and the bevel gear and the shaft thereof
• figure 2 shows schematically a vertical cross-section of a transmission and steering apparatus of the invention seen from the front
• figure 3 is a schematic cross-section at the joint of figure 2 along the line A - A
• figure 4 shows a side view of a motor sled with a front track unit installed.
• Figures 1 and 2 show a transmission and steering appara ⁇ tus according to the invention comprising a transmission shaft 4, a first bevel gear 5 connected with the drive shaft 8 of the front track unit 2 and a second bevel gear 7 connected with the transmission shaft 4 and an inter e- diate shaft 13 between the said bevel gears 5 and 7.
• the steering members of the apparatus comprise a steering shaft 9, a steering ring 10 and a steering lever 12 linked thereto.
• the front track units 2 mounted at both ends of the drive shaft 8 in the front part of the tracked vehicle function as the drive track unit of the tracked vehicle.
• the drive shaft 8 turns round the rotational axis of the interme ⁇ diate shaft 13 and, in particular, round the rotational axis of the end part of the intermediate shaft 13 which is connected to the first bevel gear 5.
• the point about which the drive shaft turns is located at the intersecti ⁇ on of the rotational axis of the intermediate shaft 13 and that of the drive shaft 8 i.e. in the first bevel gear 5 in the centre of the drive shaft 8.
• Figure 1 shows, seen from above, the motor 3 mounted on the frame 1 of the motor sled, the transmission shaft 4 and the second bevel gear 7 belonging thereto.
• the motor 3 rotates a primary variator from which the rotational movement is transmitted via a V-belt to a secondary variator.
• a shaft 6 To the secondary variator there is fixedly coupled a shaft 6, on which a gear wheel is mounted so that it transmits force via a chain to a gear.
• the gear is mounted on the transmission shaft 4 so that the gear rotates the transmission shaft 4, on one end of which there is mounted the second bevel gear 7.
• the other end of the transmission shaft 4 is rotatably pivoted on the frame 1 of the sled.
• Figure 2 shows a vertical cross-section of a transmission and steering apparatus of the invention seen from the front of the sled.
• Figure 2 shows the leading-through of the transmission and steering apparatus through the bottom plate 24 in the front part of the motor sled, on which plate a protective tube 16 is attached e.g. by welding, whose one end is mounted rigidly on the body of the second bevel gear 7.
• a circular recess 11 is made inside the protective tube 16 so that a steering ring 10 can freely turn in the recess 11.
• the recess has an opening for the movement of a steering lever 12.
• the steering lever 12 is rigidly attached to the steering ring 10, on the inside of which there are grooves for the longitudinal projections on the outside of the steering shaft 9.
• the steering shaft 9 can simultaneously move freely in vertical direction.
• the steering shaft 9 is fitted to move inside the protective tube 16 so that the upper part of the steering shaft 9 cannot touch the body of the second bevel gear 7.
• a mounting flange 32 for the suspension and the shock absorber so that it can freely rotate between the support plates 31 and 35 round the upper part of the body 21 of the first bevel gear.
• the support flange 31 and the mounting flange 32 are locked in place by a special locking nut 30.
• the rotating steering motion of the steering shaft 9 in the transmission and steering apparatus of the invention turns the body 21 of the first bevel gear 5 and, being rigidly attached thereto by means of fixing elements, the protective tubes 22 of the drive shaft 8 whose motion in turn turns the front track unit 2. Due to the way the steering shaft 9 is mounted, the first bevel gear 5 can also move vertically. For dampening vertical movements and shocks of the first bevel gear 5, there are mounted a suspension and shock absorbers 19 on the mounting flange 32. Figure 2 shows schematically such shock absorbers 19 which also comprise a supension element.
• a rubber cushion 20 is mounted on top of a fixed flange of the lower end of the steering shaft 9.
• the shock absorbers 19 are led through the bottom plate 24 of the sled and fixed by means of an auxiliary bar to the frame 1 of the sled. At the leading- through point, the shock absorbers 19 are protected by means of rubber collars fixed to the bottom plate 24 of the sled.
• the leading-through openings of the shock absorbers 19 are fitted to allow the lower ends of the shock absorbers 19 to move to such an extent as caused by the turning of the first bevel gear 5 round the joining pins 28.
• locking pins 29 must only be mounted in place and lock them in place with locking elements 36.
• the transmission and steering apparatus of the invention operates best when the first bevel gear 5 is capable of turning round the joining pins 28.
• the suspension of the front track units is at its best since they are able to move according to the terrain up and down nearly independent of each other.
• the apparatus of the invention has to be provided with such shock absor ⁇ bers which limit the vertical movement of the first bevel gear 5 suitably, taking into account the allowed vertical movements of the steering shaft 9 and the intermediate shaft 13.
• the second bevel gear 7 transmits the rotating motion of the transmission shaft 4 to the intermediate shaft 13.
• the intermediate shaft 13 is composed of two shafts 14 and 15 one within the other, the first shaft 14 being connected to the first bevel gear 5 and the second shaft 15 to the second bevel gear 7.
• the second shaft 15 is hollow and the first shaft 14 is fitted by means of a sliding slot joint to move freely in the longitudinal direction of the hollow shaft .
• the steering elements of the transmission and steering apparatus according to the invention comprise a tubular steering shaft 9 with a circular cross-section which surrounds the intermediate shaft 13, and is, at its lower part, connected to the drive shaft 8 for transmitting steering motions to the drive shaft 8.
• the steering elements additionally comprise a steering ring 10 for transmitting steering motions to the steering shaft 9.
• the steering ring 10 is fitted to the steering shaft to allow a longitudinal motion of the steering shaft 9 inside the steering ring 10.
• Steering motion from the handlebar of the motor sled is transmitted to the steering ring 10 by means of a steering lever 12.
• the steering shaft 9 is, at its lower end, connected to the drive shaft 8 via the tilting joint 18 for enabling a tilting motion.
• the steering shaft 9 is fitted to move inside the protective tube 16 which is rigidly fixed to the frame 1 of the tracked vehicle.
• the protective tube 16 comprises a recess 11 for the steering ring 10.
• the springing motion of the track unit is possible because the intermediate shaft 13 enables a longitudinal sprin ⁇ ging motion and because the steering shaft 9 is able to move longitudinally inside the protective tube 16.
• FIG. 3 shows how the intermediate shaft 13 is connected through the cardan joint 17 to the first bevel gear 5. Hence the first bevel gear 5 can turn round the joining pins 28 of the titing joint 18 if necessary.
• the first bevel gear 5 transmits the turning motion of the intermediate shaft 13 is transmitted to the drive shaft 8 which rotates the drive wheels of the front track units 2.
• Figure 4 shows schematically, seen from the side, a motor sled wherein the skis have been replaced with driving and turning front track units 2 by utilizing the apparatus according to the invention.
• This kind of vehicle is superior as compared with motor sleds with skis or the like because it can move in the terrain both in summer and winter conditions.
• the steering shaft 9 can be connec- ted to the first bevel gear 5 or the drive shaft 8 via any member which transmits the turning motion of the steering shaft 9 to a turning motion of the drive shaft 8.
• This member can be a folding joint which is connected to the steering shaft, on one hand, and to the drive shaft, on the other hand, and which transmits turning motion and allows a vertical motion of the intermediate shaft 13.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Gear Transmission (AREA)
• Arrangement And Driving Of Transmission Devices (AREA)
• Non-Deflectable Wheels, Steering Of Trailers, Or Other Steering (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8534964

Family Applications (1)

Country Status (8)

Cited By (1)

Citations (3)

• 1992
  • 1992-03-23 FI FI921242A patent/FI921242A0/fi not_active Application Discontinuation
• 1993
  • 1993-03-22 CA CA 2132748 patent/CA2132748A1/en not_active Abandoned
  • 1993-03-22 JP JP5516309A patent/JPH07507745A/ja active Pending
  • 1993-03-22 AU AU37540/93A patent/AU3754093A/en not_active Abandoned
  • 1993-03-22 WO PCT/FI1993/000107 patent/WO1993018956A1/en active Application Filing
  • 1993-03-22 RU RU94045955/11A patent/RU94045955A/ru unknown
• 1994
  • 1994-09-21 NO NO943515A patent/NO943515L/no unknown
  • 1994-09-22 SE SE9403181A patent/SE9403181D0/xx not_active Application Discontinuation

Patent Citations (3)

Non-Patent Citations (2)

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