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1. WO1993018956 - APPAREIL DE TRANSMISSION ET DE DIRECTION POUR VEHICULE A CHENILLES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

I. Transmission and steering apparatus for a tracked vehicle, which tracked vehicle comprises a driving track unit which drives the tracked vehicle, and which trans-mission and steering apparatus comprises a transmission shaft (4) , a drive shaft (8) of the driving track unit, a first bevel gear (5) connected to the drive shaft (8) and a second bevel gear (7) connected to the transmission shaft (4), an intermediate shaft (13) between said bevel gears (5, 7) for transmitting the force driving the tracked vehicle to the drive shaft (8) and steering elements (9, 10, 11, 12) for obtaining turning motions of the tracked vehicle which correspond to steering motions, characterized in that front track units (2) in the front part of the tracked vehicle function as the driving track unit and that the steering elements (9, 10, 11, 12) are connected to the drive shaft (8) and transmit steering motions to corresponding turning motions of the drive shaft (8) for steering the tracked vehicle.

2. Transmission and steering apparatus according to claim 1 characterized in that the drive shaft (8) is arranged to turn round the rotational axis of the intermediate shaft (13).

3. Transmission and steering apparatus according to claim 1 characterized in that the steering elements (9, 10,

II, 12) comprise preferably a tubular steering shaft (9) which surrounds the intermediate shaft (13) and which is connected to the drive shaft (8) for transmitting
steering motions to the drive shaft (8) .

4. Transmission and steering apparatus according to claim 3 characterized in that steering shaft (9) is attached to the body (21) of the first bevel gear.

5. Transmission and steering apparatus according to claim 3 characterized in that steering elements (9, 10, 11, 12) comprise a steering ring (10) connected to the steering shaft (9) for transmitting steering motions to the steering shaft (9) .

6. Transmission and steering apparatus according to claim 3 or 4 characterized in that the steering shaft (9) is connected to the drive shaft (8) via a tilting joint (18) for enabling tilting motion.

7. Transmission and steering apparatus according to claim 1 or 6 characterized in that the intermediate shaft (13) comprises a cardan joint (17) which is placed essentially inside the tilting joint (18) .

8. Transmission and steering apparatus according to claim 1 characterized in that the intermediate shaft (13) is composed of two shafts (14, 15) being one within the other and moving relative to each other in the direction of the intermediate shaft (Ϊ3) , the first shaft (14) of which being connected to the first bevel gear (5) and the second shaft (15) being connected to the second bevel gear (7) .

9. Transmission and steering apparatus according to claims 7 and 4 characterized in that the front track units are connected to the frame (1) of the tracked vehicle via shock absorbers (19) and the steering shaft (9) is fitted to move inside a protective tube (16) rigidly attached to the frame (1) of the tracked vehicle.

10. Transmission and steering apparatus according to claim 8 characterized in that a steering ring (10) is fitted to the steering shaft (9) to enable longitudinal motion of the steering shaft (9) inside the steering ring (10).

11. Transmission and steering apparatus according to claim 9 characterized in that the protective tube (16) comprises a recess (11) with a steering ring (10) mounted rotatably inside, the steering ring having a steering lever (12) attached rigidly thereto for transmitting steering motion to the steering ring (10) .