Dual-axle wheels suspension

Abstract

A suspension system for a dual-axle wheels assembly, including a sub-frame, a first arm connected to the sub-frame and rotatable with respect to the sub-frame about a first axis, a first connector connected to the first arm and having a first connector axis about which a first wheel rotates when connected to the first connector, the first connector axis is parallel to the first axis, a second arm connected to the sub-frame and rotatable with respect to the sub-frame about a second axis that is parallel to the first axis, a second connector connected to the second arm and having a second connector axis about which a second wheel rotates when connected to the second connector, the second connector axis is parallel to the second axis, and a motion restrainer comprising a spring and a damper and interconnecting the first arm and the second ram.

1 . A suspension system for a dual-axle wheels assembly, the suspension system comprising:
 a sub-frame;   a first arm connected to the sub-frame and rotatable with respect to the sub-frame about a first axis;   a first connector connected to the first arm and having a first connector axis about which a first wheel rotates when connected to the first connector, the first connector axis is substantially parallel to the first axis;   a second arm connected to the sub-frame and rotatable with respect to the sub-frame about a second axis that is substantially parallel to the first axis; and   a second connector connected to the second arm and having a second connector axis about which a second wheel rotates when connected to the second connector, the second connector axis is substantially parallel to the second axis.   
     
     
         2 . The suspension system of  claim 1 , wherein the first axis and the second axis are substantially perpendicular to and positioned along an axis that is substantially parallel to a longitudinal axis of the sub-frame. 
     
     
         3 . The suspension system of  claim 1 , wherein the first axis coincides with the second axis. 
     
     
         4 . The suspension system of  claim 1 , comprising a motion restrainer connected to the first arm. 
     
     
         5 . The suspension system of  claim 4 , wherein the motion restrainer restrains at least one of a displacement and a relative velocity of the first arm. 
     
     
         6 . The suspension system of  claim 1 , comprising a motion restrainer connected to the second arm. 
     
     
         7 . The suspension system of  claim 6 , wherein the motion restrainer restrains at least one of a displacement and a relative velocity of the second arm. 
     
     
         8 . The suspension system of  claim 1 , comprising a motion restrainer interconnecting the first arm and the second arm. 
     
     
         9 . The suspension system of  claim 8 , wherein the motion restrainer transfers a load applied on the first arm to the second arm and transfers a load applied on the second arm to the first arm. 
     
     
         10 . The suspension system of  claim 4 , wherein the motion restrainer is substantially perpendicular to the first axis and to the second axis and is substantially parallel to a longitudinal axis of the sub-frame. 
     
     
         11 . The suspension system of  claim 4 , wherein the motion restrainer is substantially parallel to the sub-frame. 
     
     
         12 . The suspension system of  claim 4 , wherein the motion restrainer is connected to the sub-frame. 
     
     
         13 . The suspension system of  claim 12 , wherein the motion restrainer is rotatable with respect to the sub-frame about an axis that is substantially parallel to the first axis and the second axis. 
     
     
         14 . The suspension system of  claim 1 , further comprising a drivetrain unit, the drivetrain unit comprises a motor. 
     
     
         15 . The suspension system of  claim 14 , wherein the motor is connected to one of the first arm and the second arm. 
     
     
         16 . The suspension system of  claim 14 , wherein the motor is connected to the sub-frame. 
     
     
         17 . The suspension system of  claim 14 , wherein the drivetrain unit comprises a transmission assembly to transmit rotations generated by the motor to at least one of the first connector and the second connector. 
     
     
         18 . The suspension system of  claim 17 , wherein the transmission assembly comprises:
 a first transmission unit mounted within the first arm to transmit rotations generated by the motor to the first connector; and   a second transmission unit mounted within the second arm to transmit rotations generated by the motor to the second connector.   
     
     
         19 . The suspension system of  18 , wherein:
 the first axis coincides with the second axis;   the first arm and the second arm are rotatable connected to the sub-frame using same pivoting connection along the first axis;   the motor is connected to the pivoting connection to rotate the pivoting connection; and   the first transmission unit and the second transmission unit are connected to the pivoting connection to transmit rotations thereof to the first connector and to the second connector, respectively.   
     
     
         20 . The suspension system of  claim 14 , wherein the drivetrain unit comprises a controller to control the motor. 
     
     
         21 . A dual-axle wheels assembly comprising a suspension system according to  claim 1 . 
     
     
         22 . A vehicle comprising:
 the reference frame; and   at least two suspension systems each according to  claim 1 .   
     
     
         23 . The vehicle of  claim 22 , wherein the at least two suspension systems are at opposite lateral sides of the reference frame with respect to each other. 
     
     
         24 . The vehicle of  claim 22 , wherein the at least two suspension systems are at a rear portion of the reference frame.