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1. WO1989005258 - UNITE D'ESSIEU POUR DISPOSITIF SE DEPLAÇANT SUR LE SOL OU SUR UNE BASE SIMILAIRE, TEL QU'UN VEHICULE, EN PARTICULIER UN VEHICULE TOUT TERRAIN

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Claims :

1. Axle assembly of a device movable on ground or a corresponding base, such as a vehicle (1), a work vehicle or an accessory to be connected to the device, the axle assembly comprising two axes (10', 10") being located in spaced successive relationship in the travelling direction and being defined by the rolling means, which enable the moving of the device, the axes forming a wheelbase (L) therebetween in the moving direction of the device, c h a r a c t e r-i s e d in that the assembly comprises an arm (3) pivotable about a point of support (2 ) located in the chassis (4), the free end of said arm (3) being provided with or arranged to be provided with a rolling means, such as a wheel (11) or a sprocket wheel t (12) of a track chain, said rolling means forming one axis (10) of the device together with a corresponding rolling means located on the opposite side of the arm, said arm being pivotable about said point of support (2) between two different positions (A, B) and to be supported with the aid of supporting means (7; 18) on the body of the device in such a fashion that the wheelbase (L) of the device is changed.

2. Axle assembly as claimed in claim 1,
c h a r a c t e r i s e d in that the arm (3) is pivotable from one position to an other beyond a vertical plane (V) extending perpendicularly to its pivoting direction.

3. Axle assembly as claimed in claim 1 or 2, c h a r a c t e r i s e d in that the axis (10) formed by said rolling means (11, 12) is arranged to be situated lower in one position (B) than in the other position (A) .

4. Axle assembly as claimed in claims 2 and 3, c h a r a c t e r i s e d in that in the position (B) corresponding to the lower position of the axis (10) the arm (3) is in a position where it is directed farther from the midpoint of the wheelbase (L) and correspondingly in the other, upper position, the arm (3) is in a position where it is directed towards the midpoint of the wheelbase (L) .

5. Axle assembly as claimed in claims 3 or 4, c h a r a c t e r i s e d in that in one position

(A) corresponding to the upper position of the axis (10) the arm (3) forms a small angle of ca. 0 to 10° with a "horizontal plane (H) and in* the other position

(B) corresponding to the lower position of the axis (10) the arm forms a greater angle of ca. 30 to 75° with a horizontal plane (H) , said latter angle being formed on the opposite side of a vertical plane extending transversely to the direction of the device .

6. Axle assembly as claimed in claim 2,
c h a r a c t e r i s e d in that the arm ( 3 ) forms a small angle of 0 to 10° with a horizontal plane (H) both in one position (A) and .in the other position (C) where it is pivoted to the opposite side of said vertical plane (V) .

7. Axle assembly as claimed in any of preceding claims, c h a r a c t e r i s e d in that it comprises two points of support (2', 2") disposed in spaced successive relationship in the direction of the device, both points being provided with an arm (31, 3") pivotable thereabout and comprising the axis (10 ', 10") of the device.

8. Axle assembly as claimed in any of preceding claims, c h a r a c t e r i s e d in that the arm (3) can be provided selectively with rolling means enabling the moving of the device, such as wheels (11) or driving sprocket wheels (12) of a track chain, for converting a vehicle from a wheeled vehicle to a track chain vehicle.

9.' Axle assembly as claimed in any of preceding claims, c h a r a c t e r i s e d in that the arm (3) is secured to the chassis (4) substantially at the Longitudinal center line of the device in such a fashion that in at least one position (B) of the arm (3), a space is formed at the sides of the device underneath the chassis (4)„ said space being limited towards three directions at the location of the axis (10) of the device, namely by lower part of the chassis (4), by the arm (3) and by the axle located at the end of the arm (3 ) .

10. Axle assembly as claimed in any of preceding claims, c h a r a c t e r i s e d in that the rolling means (11, 12) of the device are arranged to be driven by means of a hydraulic power transmission.

11. Axle assembly as claimed in claim 10,
c h a r a c t e r i s e d -in that a hydraulic motor (13) driving the driving means is disposed at the free end of the arm at the location where the rolling means are mounted.

12. Axle assembly as claimed in claim 11,
c h a r a c t e r i s e d in that conduits (19) for conveying pressure medium to the rolling means (11, 12) are placed inside the arm (3).