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1. WO2020115103 - CHARGEUSE SUR ROUES ARTICULÉES ET PROCÉDÉ DE COMMANDE DES OPÉRATIONS DE DIRECTION D'UNE CHARGEUSE SUR ROUES ARTICULÉES

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

[ EN ]

CLAIMS

1.- Method of controlling the steering operations of an articulated wheel loader (1) having a front body portion (2) provided with a bucket (3) and having a couple of front wheels (4) and a rear body portion (6) connected in a pivoting manner with the with the front body portion (2) and provided with a couple of rear wheels (8), the method comprising the steps of: providing a steering command to steer the wheel loader (1) that proceeds in a forward direction or in a rear direction;

detecting (12) the angle (a) that a front longitudinal axis (Fa) of the front body portion (2) forms with a rear longitudinal axis (Ra) of the rear body portion (6);

in the case that the measured angle (a) is greater than a threshold (CXMAX) automatically implementing a steering brake function wherein one wheel (4,8) of the front body portion (2) or of the rear body portion (6) that is on the steering side is independently braked to reduce its speed to zero so that the wheel becomes a pivot point during to cornering in order to minimize the turning radius.

2.- Method as claimed in claim 1, wherein the wheel that is braked is selected depending on the direction of the wheel loader, the direction may be either a forward direction or a backward direction.

3.- Method as claimed in claim 2, wherein if the wheel loader (1) is proceeding in a forward direction the steering brake function provides to independently brake one wheel (4) of the front body portion (2);

if the wheel loader (1) is proceeding in a rear direction the steering brake function provides to independently brake one wheel (8) of the rear body portion (6) .

4.- Method as claimed in claim 1, wherein the wheel that is braked is selected based a load distribution determination step wherein it is detected an unloaded condition wherein no load is present in the bucket (3) and a loaded condition wherein a load is present in the bucket (3) .

5.- Method as claimed in claim 4, wherein under the loaded condition the steering brake function provides to independently brake one wheel (4) of the front body (2) portion if the wheel loader (1) is proceeding forward; if the wheel loader (1) is proceeding in a rear direction the steering brake function provides to independently brake one wheel (8) of the rear body portion (6);

under the unloaded condition the steering brake function provides to independently brake one wheel (8) of the rear body portion (8) if the wheel loader is proceeding forward; if the wheel loader is proceeding in a rear direction the steering brake function provides to independently brake one wheel (4) of the front body portion (2) .

6.- Articulated wheel loader (1) having a front body portion (2) provided with a bucket (3) and having a couple of front wheels (4) and a rear body portion (6) connected in a pivoting manner with the with the front body portion (2) and provided with a couple of rear wheels (8), the wheel loader (1) comprising:

a control unit (10) providing a steering command to steer the wheel loader (1) that proceeds in a forward direction or in a rear direction;

a sensor (12) detecting the angle (a) that a front longitudinal axis (Fa) of the front body portion (2) forms with a rear longitudinal axis (Ra) of the rear body portion (6) ;

the control unit (10), in the case that the measured angle (a) is greater that a threshold (CXMAX) is configured to automatically implement a steering brake function wherein one wheel (4,8) of the front body portion (2) or of the rear body portion (6) that is on the steering side is independently braked to reduce its speed to zero so that the wheel becomes a pivot point during to cornering in order to minimize the turning radius .

7.- Articulated wheel loader (1) as claimed in claim 6, wherein the control unit (10) is configured to select the wheel to be braked depending on the direction of the wheel loader, the direction may be either a forward direction or a backward direction.

8.- Articulated wheel loader (1) as claimed in claim 7, wherein if the wheel loader (1) is proceeding in a forward direction the control unit (10) provides to independently brake one wheel (4) of the front body portion (2);

if the wheel loader (1) is proceeding in a rear direction the control unit (10) provides to independently brake one wheel (8) of the rear body portion (6) .

9.- Articulated wheel loader (1) as claimed in claim 6, wherein the control unit (10) is configured to select the wheel to be braked upon the detection, by means of a load sensor (14), of an unloaded condition wherein no load is present in the bucket (3) and a loaded condition wherein a load is present in the bucket (3) .

10.- Articulated wheel loader as claimed in claim 9, wherein the control unit (10) is configured under the loaded condition to independently brake one wheel (4) of the front body portion (2) if the wheel loader is proceeding forward; if the wheel loader is proceeding in a rear direction the control unit (10) provides to independently brake one wheel (8) of the rear body portion (6);

under the unloaded condition the control unit (10) provides to independently brake one wheel (8) of the rear body portion (6) if the wheel loader (1) is proceeding forward; if the wheel loader is proceeding in a rear direction the control unit (10) provides to independently brake one wheel (4) of the front body portion (2) .